China is a huge country, and has a great variety of climates. Winter is freezing cold in the north, in the mountains and the plateaus, while it's mild in the south; summer is hot everywhere, except in the highlands and in the high mountains. If we exclude the vast western desert areas, where rainfall is scarce and irregular, summer is the rainiest season. The rainiest part of the country is the south-east, the least rainy the north-west.



The north-eastern part of China, called Manchuria, has a markedly continental climate, with frigid and dry winters, and hot and rainy summers. The winter monsoon brings cold air masses from nearby Siberia, while the summer monsoon brings warm and moist air masses from the south, in fact summer, from June to August, is the only season where there are significant rains. The rains are quite frequent also in May and September, though not abundant. Rainfall, or rather snowfall considering the temperatures, is definitely scarce in the long cold season.
Winter in this area is very cold, since the average January temperature is below -10 °C (14 °F), and even below -20 °C (-4 °F) in the northern part. Cold records are around -40 °C (-40 °F).
In Harbin, a metropolis of ten million inhabitants, the average January temperature is -19 °C (-2 °F). From November to March, the temperature remains below freezing (0 °C or 32 °F) even during the day. In winter the sky is often clear, however, given the low temperatures, the little snow that falls doesn't melt, so the winter landscape is usually covered with snow. Due to the cold, the sculptures of the "Harbin International Ice and Snow Sculpture Festival", which is held every year in January, remain standing for weeks. Here are the average temperatures of Harbin.
Average temperatures - Harbin

Harbin	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Harbin	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	-25	-21	-10	0	8	14	18	16	9	0	-11	-20
Max (°C)	-13	-9	2	13	21	26	28	26	21	12	0	-10
Min (°F)	-13	-6	14	32	46	57	64	61	48	32	12	-4
Max (°F)	9	16	36	55	70	79	82	79	70	54	32	14

In spring, the temperature rises rapidly, and summer is a warm season, but it's also rainy: in July, 165 millimetres (6.5 inches) of rain fall, and relative humidity is high. In the hottest days, when it doesn't rain, the temperature can reach 35 °C (95 °F). Here is the average precipitation.
Average precipitation - Harbin

Harbin	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Harbin	J	F	M	A	M	J	J	A	S	O	N	D	Y
Prec. (mm)	4	6	17	25	45	90	165	120	55	35	15	8	585
Prec.(in)	0.2	0.2	0.7	1	1.8	3.5	6.5	4.7	2.2	1.4	0.6	0.3	23
Days	1	1	3	3	7	9	10	11	7	5	2	2	61

In Harbin the sunshine amount is quite good, though not exceptional, all year round.
Sunshine - Harbin

Harbin	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Harbin	J	F	M	A	M	J	J	A	S	O	N	D
Sun (hours)	5	6	7	8	9	9	8	8	8	7	6	5

Further south, in Shenyang, a city of eight million inhabitants, the temperature goes from -11 °C (12 °F) in January, to 24.5 °C (76 °F) in July; even here winter is quite sunny, while summer is humid and rainy.
Average temperatures - Shenyang

Shenyang	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Shenyang	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	-17	-13	-4	4	11	17	20	19	12	4	-4	-13
Max (°C)	-5	-2	6	16	23	27	29	28	24	16	6	-2
Min (°F)	1	9	25	39	52	63	68	66	54	39	25	9
Max (°F)	23	28	43	61	73	81	84	82	75	61	43	28

In Shenyang, the sun shines more or less like in Harbin (about 2,500 hours a year), though a bit less often in the summer.
Sunshine - Shenyang

Shenyang	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Shenyang	J	F	M	A	M	J	J	A	S	O	N	D
Sun (hours)	5	6	7	8	8	8	7	7	8	7	5	5

In the northernmost part of Manchuria, near the border with Siberia, the summer becomes cooler, so that the average drops below 20 °C (68 °F) even in July. Winters are even colder, so that the average in January approaches -30 °C (-22 °F), and cold records are about -50 °C (-58 °F), as we can see from the average temperatures of Tahe.
Average temperatures - Tahe

Tahe	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Tahe	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	-36	-33	-23	-8	0	6	10	8	1	-10	-25	-33
Max (°C)	-21	-15	-5	6	16	22	23	21	14	4	-11	-20
Min (°F)	-33	-27	-9	18	32	43	50	46	34	14	-13	-27
Max (°F)	-6	5	23	43	61	72	73	70	57	39	12	-4

The best times to visit Manchuria are spring and autumn, and in particular the months of May and September.




Nearly half of China is arid or desert, including Tibet, which, however, has a peculiar climate. The desert belt begins north-west of Beijing, at no great distance from the capital, so much so that at times the same capital is hit by dust storms, and extends westward, covering almost the entire Inner Mongolia, where we find the Chinese side of the Gobi desert, and then further to the west, in the areas at low or middle altitudes of Xinjiang and Gansu, where we find Taklamakan (or Taklimakan), a huge sand desert. The climate in this area is strongly continental, with freezing winters and hot summers, sometimes torrid especially at lower altitudes, although it should be noted that this area is mostly occupied by plateaus, around 800/1,200 metres (2,600/4,000 feet) above sea level, where the summer heat, though still present, it's tempered by the altitude. Sunshine is frequent throughout the year. The wind is often strong, and can be raise storms in winter and spring.



In Kashgar, an oasis along the ancient Silk Road, located at 1,300 metres (4,250 feet) above sea level, the temperature goes from -5 °C (23 °F) in January to 25 °C (77 °F) in July, with sometimes torrid days despite the altitude, while nights are usually pleasant. In a year, only 60 millimetres (2.4 in) of rain (or snow in winter) fall, with a greater chance in summer.
Below 1,000 metres (3,300 feet), in summer the temperature can reach 40 °C (104 °F). The hottest area is the Turpan Depression (or Turfan), which is also the hottest place in China: a small area at sea level (or even below, hence the name depression), where winter is freezing, but summer is hot, since daytime temperatures usually hover around 38/40 °C (100/103 °F) from June to August, with peaks of 45 °C (113 °F). To avoid the climate extremes, you can visit this depression from mid-March to mid-April and in October.
Average temperatures - Turpan

Turpan	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Turpan	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	-12	-6	3	12	19	23	25	23	16	7	-2	-10
Max (°C)	-2	6	16	26	33	38	40	38	32	22	10	-1
Min (°F)	10	21	37	54	66	73	77	73	61	45	28	14
Max (°F)	28	43	61	79	91	100	104	100	90	72	50	30

In Turpan the sun shines quite often, but especially in summer, for a total of almost 3,000 hours per year.
Sunshine - Turpan

Turpan	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Turpan	J	F	M	A	M	J	J	A	S	O	N	D
Sun (hours)	5	7	8	9	10	10	10	10	9	8	6	4

Ürümqi, a city of three million inhabitants, located at 850 metres (2,800 ft) above sea level, is the largest city in the world farthest from the sea, which lies 2,400 kilometres (1,500 miles) away. Here the average temperature goes from -13 °C (9 °F) in January to 25 °C (77 °F) in July; in summer, it can sometimes exceed 40 °C (104 °F), while in winter it can plunge to -30 °C (-22 °F). Due to the proximity to the Tian Shan Range, precipitation is more frequent than in other places of the area, but it remains scarce due to the low moisture available, and it doesn't reach 250 mm (10 in) per year. Spring and autumn are the best times to visit the city, and in general these desert areas located on the plateau at about a thousand metres (3,300 feet) of altitude: in particular the months of May and September.
Average temperatures - Urumqi

Urumqi	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Urumqi	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	-18	-16	-5	5	12	17	19	18	12	3	-6	-14
Max (°C)	-8	-6	4	17	24	29	31	30	24	14	2	-6
Min (°F)	0	3	23	41	54	63	66	64	54	37	21	7
Max (°F)	18	21	39	63	75	84	88	86	75	57	36	21

In Ürümqi the sun shines a little less often than in Turpan, especially from November to April; the total is about 2,500 hours per year.
Sunshine - Urumqi

Urumqi	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Urumqi	J	F	M	A	M	J	J	A	S	O	N	D
Sun (hours)	3	5	6	8	9	9	10	10	9	7	4	3

In the north-west, in the area north of Urumqi and between Mongolia and Kazakhstan, Dzungaria has a frigid winter, with averages ranging between -10 °C and -20 °C (14 and -4 °F), while summer becomes progressively cooler as you proceed towards the border with Russia: in Altay, 1,000 metres (3,300 feet) above sea level, the average of January is -16 °C (3 °F), that of July is 20 °C (68 °F).



In China there are several mountain ranges. We have not shown those of Tibet in the map, because most of them have the same climate of Tibet itself. Among the mountainous areas, we have to distinguish between two main zones: the several chains of the western part (inside the burgundy area in the left, where the Himalayas are also found), and those of the south-east (Yunnan, in the black circle at the bottom), which due to southern latitude and lower altitude have a much milder climate, so that we can define them as "warm mountains".
Along the western and southern border of China, there are several mountain ranges: Tian Shan, Pamir, Karakoram, Himalaya, while north of Tibet we find Kunlun Shan. Clearly, the temperatures vary according to latitude and altitude.
In Akqi, located at 2,000 metres (6,500 feet) above sea level in the northwest and near the border with Kyrgyzstan, the average temperature goes from -8 °C (18 °F) in January to 19 °C (66 °F) in July: as you can see, the strong summer heating of the Asian continent is evident even at high altitudes.
In China the two world's highest mountains are found: Mount Everest, on the border with Nepal, and K2, on the border with Pakistan. On top of Everest, the average temperature goes from -36 °C (-33 °F) in January, to -19 °C (-2 °F) in July; the cold record is about -60 °C (-76 °F). The temperature never exceeds the melting point. From June to September, the summer monsoon brings clouds and snow showers. In winter, from November to February, the western jet stream moves to a lower latitude and reaches this area, bringing hurricane intensity winds, of more than 250 kph (155 mph), but strong winds are also possible in spring and autumn.

In the province of Yunnan, the "warm mountains" have a definitely more pleasant climate. In Kunming 1,900 metres (6,200 ft) above sea level, the average goes from 9.5 °C (49.5 °F) in January to 21 °C (69.5 °F) in July: therefore, the climate is temperate, even though the winter nights can be cold. Here are the average temperatures in Kunming.
Average temperatures - Kunming

Kunming	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Kunming	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	4	5	8	11	15	17	17	17	15	13	8	4
Max (°C)	16	18	21	24	25	25	24	25	23	21	18	16
Min (°F)	39	41	46	52	59	63	63	63	59	55	46	39
Max (°F)	61	64	70	75	77	77	75	77	73	70	64	61

The rainfall amounts to 1,000 mm (40 in) per year, the bulk of which occurs in summer: in July and August, more than 200 mm (8 in) of rain per month fall. Here is the average precipitation.
Average precipitation - Kunming

Kunming	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Kunming	J	F	M	A	M	J	J	A	S	O	N	D	Y
Prec. (mm)	10	10	15	25	90	175	205	205	120	90	40	15	1005
Prec.(in)	0.4	0.4	0.6	1	3.5	6.9	8.1	8.1	4.7	3.5	1.6	0.6	39.6
Days	2	3	3	4	9	14	16	16	12	11	5	2	96

In the far south, on the border with Burma, Laos and Vietnam, the climate is sub-tropical even at an altitude between 1,000 and 1,500 metres (3,300 and 4,900 feet): winter is mild, while summer is hot and humid, with heavy rains. This area can be visited in spring, especially in March and April; in summer, even though the temperatures are pleasant, the rains are frequent and abundant and the sunshine amount is poor. Here are the average daily sunshine hours in Kunming.
Sunshine - Kunming

Kunming	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Kunming	J	F	M	A	M	J	J	A	S	O	N	D
Sun (hours)	7	8	8	8	7	4	4	5	4	5	6	6

The area of Beijing has a continental climate, although not as extreme as in the north-east: winters are cold, with average temperatures in January ranging from -10 °C to 0 °C (14 to 32 °F), and summers are hot and humid. Summer is the only rainy season, while in the other seasons the sun usually shines. Annual precipitation goes from 300 to 700 millimetres (12 to 27.5 in), and is more abundant near the sea.
In Beijing, the winter is cold: the average in January is -3.5 °C (26 °F), with lows around -8 °C (17 °F), and highs just above freezing. The sky is often clear (apart from the pollution plaguing the capital as well as other Chinese cities), and freezing winds blow, bringing dust from the desert of Mongolia. Snowfall is relatively rare.
Here are the average temperatures.
Average temperatures - Beijing

Beijing	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Beijing	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	-8	-6	0	8	14	19	22	21	15	8	0	-6
Max (°C)	2	5	12	20	26	30	31	30	26	19	10	4
Min (°F)	18	21	32	46	57	66	72	70	59	46	32	21
Max (°F)	36	41	54	68	79	86	88	86	79	66	50	39

In spring, the temperature increases rapidly, so much so that already in April it often exceeds 20 °C (68 °F), and in May the average maximum is around 26 °C (79 °F). In June, it's already hot as in midsummer, but in July and August, the maximum temperature does not increase any more, because the summer monsoon arrives at about the middle of June, bringing heavy rains and high humidity. So, in Beijing summer is hot, but especially muggy. July and August are the rainiest month. Anyway, even in summer there may be entire weeks without rain, and these periods are usually the hottest. The monsoon is quite irregular, here as well as in the north-eastern part of China, so the rains may be more or less abundant depending on the year.
Here is the average precipitation.
Average precipitation - Beijing

Beijing	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Beijing	J	F	M	A	M	J	J	A	S	O	N	D	Y
Prec. (mm)	3	6	10	25	30	70	175	180	50	20	6	2	578
Prec.(in)	0.1	0.2	0.4	1	1.2	2.8	6.9	7.1	2	0.8	0.2	0.1	22.8
Days	2	3	4	5	6	9	14	12	7	5	3	2	72

To escape the summer heat, locals go to Beidaihe or generally along the coast of the Bohai Sea, where sea breezes temper the heat. In September, in Beijing the humidity decreases and the weather becomes pleasant, while in October the nights begin to be very cool.
The sun in Beijing shines quite often all year round, for a total of 2,650 hours. The least sunny months, at least in comparison to the length of the days, are July and August.
Sunshine - Beijing

Beijing	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Beijing	J	F	M	A	M	J	J	A	S	O	N	D
Sun (hours)	6	7	7	8	9	9	7	7	8	7	6	6

In the capital, the best times are therefore spring and autumn: April-May and September-October.



Near Beijing, the sea is very cold in winter, while it becomes warm enough for swimming from July to September, as we can see in the following table.
Sea temperature - Beidaihe

Beidaihe	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Beidaihe	J	F	M	A	M	J	J	A	S	O	N	D
Sea (°C)	4	3	4	7	12	18	23	25	23	19	14	8
Sea (°F)	39	37	39	45	54	64	73	77	73	66	57	46

North-west of Beijing, along the course of the Yellow River (Huang He) there are two cities, both at the northern edge of this area, beyond which the desert is found: Baotou and Hohhot, respectively, the principal city and the capital of Inner Mongolia. Both are located at 1,000 metres (3,300 feet) above sea level, and in winter they are very cold, also because of altitude, in fact the average temperature in January is around -10 °C (14 °F). Summer is hot, a little less than in Beijing, since the July average is 23.5 °C (74.5 °F). Precipitation amounts to only 300 mm (12 in) per year, because the summer rains are less abundant than in the capital, around 80/100 mm (3.1/4) per month in July and August.
Average temperatures - Baotou

Baotou	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Baotou	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	-17	-13	-6	2	9	14	17	15	9	1	-7	-14
Max (°C)	-4	0	8	17	24	28	30	27	22	15	5	-2
Min (°F)	1	9	21	36	48	57	63	59	48	34	19	7
Max (°F)	25	32	46	63	75	82	86	81	72	59	41	28

Every now and then the Beijing area, especially in the part closest to the sea, can be affected by typhoons or their remains. Typhoons occur in summer and early autumn, and are more common in the southern areas (see the following paragraphs, the area of Shanghai and the south).

On the border between this area and the next and milder area of Shanghai, we find the city of Xi'an, famous for the terracotta army.



In this central area, the climate becomes milder in winter, since the average temperature in January is between 0 and 10 °C (32 and 50 °F), while summer is warmer and longer, with a greater influence of the summer monsoon. In addition to the higher temperature, cloudiness and rainfall throughout the year increase, so that rainfall hovers between 1,000 and 1,600 mm (40 to 63 in) per year. Along the lower reaches of the Yangtze River (or Chang Jiang), we find some large cities with a similar climate, such as Wuhan, Nanking (Nanjing) and Shanghai.
In Shanghai, winter is certainly milder than in Beijing, but it's still pretty cool, since the average temperature in January is 4 °C (39 °F). Unlike in Beijing, in winter the sky is often cloudy, and the rains are quite frequent, though not abundant. Summer, from June to September, is hot and muggy, with abundant rainfall. July and August are the hottest months, with daily averages of 27/28 °C (81/82 °F), and despite the proximity to the sea, in a city so large the urban heat island effect is evident, and the breeze is not so effective.
Here are the average temperatures.
Average temperatures - Shanghai

Shanghai	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Shanghai	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	1	2	5	11	16	20	25	25	21	15	9	2
Max (°C)	8	9	13	19	24	27	32	32	27	22	17	11
Min (°F)	34	36	41	52	61	68	77	77	70	59	48	36
Max (°F)	46	48	55	66	75	81	90	90	81	72	63	52

Precipitation amounts to 1,100 mm (43 in) per year, with a maximum in summer. Here is the average precipitation.
Average precipitation - Shanghai

Shanghai	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Shanghai	J	F	M	A	M	J	J	A	S	O	N	D	Y
Prec. (mm)	40	60	80	100	115	150	130	135	155	60	50	35	1110
Prec.(in)	1.6	2.4	3.1	3.9	4.5	5.9	5.1	5.3	6.1	2.4	2	1.4	43.7
Days	9	10	13	13	13	14	12	10	12	9	8	7	130

The sun in Shanghai never shines very often, and the total does not reach 1,800 hours.
Sunshine - Shanghai

Shanghai	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Shanghai	J	F	M	A	M	J	J	A	S	O	N	D
Sun (hours)	4	4	4	5	5	4	6	6	6	5	4	4

In Shanghai, the sea is warmer than in the north, and it's warm enough for swimming from July to September, while it is a bit cool in June and October.
Sea temperature - Shanghai

Shanghai	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Shanghai	J	F	M	A	M	J	J	A	S	O	N	D
Sea (°C)	10	8	8	11	16	21	25	27	25	22	18	14
Sea (°F)	50	46	46	52	61	70	77	81	77	72	64	57

In Chongqing, located south of Shanghai and very far from the sea, winter is milder than in Shanghai, since the average in January is 8 °C (46.5 °F), and it's also less rainy, but cloudiness is even more frequent, so that the sky is almost always overcast. Summer is even more hot and muggy: there is no relief on summer nights, when temperatures do not drop below 24/25 °C (75/77 °F). Moreover, here and across southern China, the monsoon rains begin earlier, with a peak in May and June, and they last until October.

During summer, this area can be reached by typhoons, tropical cyclones which originate in the Pacific Ocean, and then move over Southeast Asia, penetrating several hundred kilometres (or miles) inland, although their effects are more remarkable on coastal regions. Typhoons can bring strong winds and torrential rains.



In the southernmost part of China, winter is very mild, so that the average temperature in January is above 10 °C (50 °F), while there's a long tropical summer. Annual precipitation is between 1,200 and 2,000 millimetres (47 and 79 inches), with a winter minimum and a summer maximum; rainfall, during the long hot season, occurs mostly in the form of showers and thunderstorms, in the afternoon or evening, while it can be long and torrential during typhoons, which are more frequent from August to early October. The sun does not shine very often.
In Fuzhou, the summer, with highs equal to or higher than 28 °C (82 °F), lasts 5 months, from mid-May to mid-October, while in Guangzhou (Canton) it lasts six months, from May to October.
Here are the average temperatures in Guangzhou.
Average temperatures - Guangzhou

Guangzhou	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Guangzhou	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	10	11	15	19	23	25	25	25	24	21	16	11
Max (°C)	18	18	22	26	29	31	33	33	31	29	24	21
Min (°F)	50	52	59	66	73	77	77	77	75	70	61	52
Max (°F)	64	64	72	79	84	88	91	91	88	84	75	70

However, the rainiest period in the south goes from April to September, and in October the rains fall sharply, even though it's still warm. At these southern latitudes, the wettest period goes no longer from May to June (as was the case of the area located south of Shanghai), but it extends throughout the long summer: in Guangzhou, rainfall exceeds 230 mm (9 mm) per month from May to August.
Here is the average precipitation in Guangzhou.
Average precipitation - Guangzhou

Guangzhou	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Guangzhou	J	F	M	A	M	J	J	A	S	O	N	D	Y
Prec. (mm)	45	65	85	180	285	260	230	220	170	80	40	25	1685
Prec.(in)	1.8	2.6	3.3	7.1	11.2	10.2	9.1	8.7	6.7	3.1	1.6	1	66.3
Days	8	11	15	16	18	19	16	16	13	7	6	5	150

From February to May the sky is often cloudy, while in summer and autumn the sun is seen roughly half the time.
Sunshine - Guangzhou

Guangzhou	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Guangzhou	J	F	M	A	M	J	J	A	S	O	N	D
Sun (hours)	4	3	2	2	3	5	7	6	6	6	6	5

The sea at the latitude of Guangzhou, therefore at the Tropic, is never cold, even though it gets a little cool from December to March, while it is definitely warm in summer.
Sea temperature - Shantou

Shantou	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Shantou	J	F	M	A	M	J	J	A	S	O	N	D
Sea (°C)	21	20	22	24	26	28	29	28	28	26	24	21
Sea (°F)	70	68	72	75	79	82	84	82	82	79	75	70

In the far south, the island of Hainan has a quasi-tropical climate, since the average January temperature is near 20 °C (68 °F). In this island, the interior is occupied by hills and low mountains, where tropical forests grow. The rains are abundant from May to November on the eastern side, while the western side is more sheltered, and receives moderate rains only from June to October, and even abundant in August and September; however, the total annual rainfall hardly reaches 1,000 mm (40 in), not a lot for a tropical area, while on the eastern side of the island it rains about twice as much. However, in winter the sky is often cloudy, even though there is little rain.
Here is the average rainfall of Haiku, on the northern coast, where the rains are at an intermediate level, around 1,600 mm (63 in) per year.
Average precipitation - Haikou

Haikou	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Haikou	J	F	M	A	M	J	J	A	S	O	N	D	Y
Prec. (mm)	20	35	50	105	185	210	210	225	250	200	95	35	1625
Prec.(in)	0.8	1.4	2	4.1	7.3	8.3	8.3	8.9	9.8	7.9	3.7	1.4	64
Days	9	11	10	12	16	16	14	15	15	13	10	8	149

And here are the average temperatures.
Average temperatures - Haikou

Haikou	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Haikou	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	15	16	19	22	24	25	25	25	24	22	20	16
Max (°C)	21	22	26	30	32	33	33	32	31	28	25	22
Min (°F)	59	61	66	72	75	77	77	77	75	72	68	61
Max (°F)	70	72	79	86	90	91	91	90	88	82	77	72

In Haikou, the sun shines about 2,000 hours per year, and in summer it shines a little more often than in the southern Chinese mainland.
Sunshine - Haikou

Haikou	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Haikou	J	F	M	A	M	J	J	A	S	O	N	D
Sun (hours)	4	3	4	6	7	7	8	7	6	6	5	4

The sea temperature in Hainan is similar to that of Guangdong, although it is a bit warmer in winter. However, it is a bit cool for swimming from January to March.
Sea temperature - Haikou

Haikou	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Haikou	J	F	M	A	M	J	J	A	S	O	N	D
Sea (°C)	21	21	22	24	27	29	29	29	29	28	25	23
Sea (°F)	70	70	72	75	81	84	84	84	84	82	77	73

Given the vastness of the country and the wide climatic variety, it's hard to find a single period which could be the best throughout the country. In general, however, the best times are spring and autumn.
In Beijing, in April and October the days are pleasant, while at night it can get a bit cold, besides, spring is preferable because it has longer days. May and September are warmer, but they are also fine.
In Shanghai, which has a longer summer, you may prefer April, May and October.
The warm mountains of Yunnan can be visited in March and April.
In Guangzhou and in the south, since spring is already rainy, we prefer October and November, perhaps avoiding early October, because there's still some risk of typhoons.
The north-eastern cold area and the northwestern desert area, both hot in summer, can be visited in May and September.
You can visit Tibet in summer (see the climate of Tibet).


In winter: for Harbin and the north-east, the mountains and the desert, especially in the northern part (Urumqi and Dzungaria), cold weather clothing, synthetic thermal long underwear, parka, Gore-Tex jacket, gloves, hat, scarf.
For the Beijing area, very warm clothes, down jacket, gloves, scarf, hat, which can be removed in the warmer days of February.
For the area of Shanghai, warm clothes, sweater, jacket, possibly a raincoat or umbrella.
For Yunnan, in Kunming, warm clothes, sweater, jacket, hat for colder nights, heavier garments if you want to rise in altitude and climb mountains.
For the south, Fuzhou and Guangzhou, spring/autumn clothes, sweater, jacket, raincoat or umbrella. For Hainan, spring/autumn clothes, light for the day, sweater, jacket.

In summer: for Harbin and the north-east, light clothing, a sweatshirt or sweater for the evening, raincoat or umbrella.
For the desert, light clothing, scarf for the wind, sweatshirt or sweater for the evening at hill altitudes and in the far north; you can add a jacket, maybe long for the wind, above 1,000 metres (3,300 feet).
For the high mountains (Tian Shan, Pamir, Karakoram, Himalayas), down jacket, hat, gloves, scarf.
For the Beijing area, light clothes, light raincoat or umbrella, scarf for the wind, light sweatshirt for air conditioned places.
For the area of Shanghai, the south and Hainan, tropics-friendly, lightweight clothes, light raincoat or umbrella, light sweatshirt and scarf for air conditioned places.
For Yunnan, in Kunming, spring/autumn clothes, light for the day, sweater, raincoat and umbrella; bring heavier clothes if you plan to climb mountains.

If you forgot something, you can find it easily and at low price on the spot.
For women, it is preferable to avoid shorts and miniskirts in rural and non-tourist areas.