The climate of Prague, the Czech capital, is moderately continental, with cold winters, in which the temperature is often below freezing (0 °C or 32 °F), and mild or pleasantly warm summers.
Here are the average temperatures.
Average temperatures - Prague

Prague	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Prague	J	F	M	A	M	J	J	A	S	O	N	D
Min (°C)	-4	-4	0	3	8	11	13	13	9	5	1	-3
Max (°C)	1	3	8	14	19	22	24	24	19	13	6	2
Min (°F)	25	25	32	37	46	52	55	55	48	41	34	27
Max (°F)	34	37	46	57	66	72	75	75	66	55	43	36

Precipitation is not abundant, given that it totals 530 millimetres (21 inches), but it is well distributed over the months, with a maximum between the second part of spring and summer, and a minimum in winter, when it usually occurs in the form of snow or sleet.
Here is the average precipitation.
Average precipitation - Prague

Prague	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Prague	J	F	M	A	M	J	J	A	S	O	N	D	Y
Prec. (mm)	25	25	30	40	75	75	65	70	40	30	30	25	525
Prec. (in)	1	1	1.2	1.6	3	3	2.6	2.8	1.6	1.2	1.2	1	20.7
Days	7	6	6	7	10	10	9	9	7	6	7	7	90

Winter, from December to February, is cold: the average temperature is slightly below freezing. Due to stagnation of cold air in the lowest layers, there are many gray days, with snow typically light but quite frequent. On the other hand, cold air masses of Siberian origin can lead to intense frosts, in which the temperature can plunge below -20 °C (-4 °F). Here are some values recorded in particularly cold winters: February 1940: -29 °C (-20 °F); February 1956: -28 °C (-18 °F); January: 1985: -25 °C (-13 °F); January 1987: -24 °C (-11 °F); December 1996: -23 °C (-9 °F); February 2012: -22 °C (-8 °F).

Spring, from March to May, is a season characterized by an unstable weather, with the first warm days, but also the return of cold weather, with possible snow showers and frosts in March, but sometimes also in April. In early May it can still be cold, with lows near freezing. Typically, the temperature becomes mild in a more stable manner from the second half of May, the month in which also the first afternoon thunderstorms begin to erupt.

Summer, from June to August, is very mild or pleasantly warm: daytime temperatures hover around 22 °C (71.5 °F) in June and 24 °C (75 °F) in July and August. Atlantic fronts can pass in this season as well, bringing a bit of rain. On the contrary, in fine weather, thunderstorms can break out in the afternoon. In July and August, sometimes it can get hot, but all in all the days in which the temperature exceeds 30 °C (86 °F) are rare.

In Autumn, the first half of September is still pleasant, then gradually becomes gray and cloudy, with quite frequent rains. Already in October, the daytime temperature often remains below 15 °C (59 °F). The first snowfalls usually occur in November, which is in any case a cold month.



The amount of sunshine in Prague is quite good from May to August, when sunny days are frequent, and there are on average 7 hours of sunshine per day, while it is definitely low from November to February, when there are only 1.5/2.5 hours of sunshine per day.
Sunshine - Prague

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

The best time to visit Prague runs from mid-May to mid-September, being the warmest and sunniest of the year. Sometimes it can be hot in July and August, while in other circumstances nights can be cool, or even a little cold, even in these months, so it can be useful to bring a sweatshirt or sweater and a light jacket for the evening.