, given that winters are mild and rainy and summers are hot and sunny. However, there are some differences in comparison with the typical Mediterranean climate: in winter, fog can form at night and in the early morning; in summer, there are strong diurnal temperature variations, so it is quite cool at night and hot during the day; the rainy period is shorter, so in autumn, in September and October, it still rains rarely.
, in the northernmost part of San Joaquin valley. Here, the difference in temperature between night and day and between winter and summer are much wider than in San Francisco, which is located 100 km (60 mi) to the west.
of the year, the temperature generally drops to -2/-5 °C (23/28 °F) at night, while during the day it reaches about 10 °C (50 °F). But in December 1990, it reached -8 °C (17.5 °F). Snow is extremely rare: there was a light snowfall in February 1976, and one without accumulation in December 2009.
On the days when there is no fog and it does not rain, the temperature can reach 18/19 °C (64/66 °F) even in the middle of winter.
of the year, the temperature can reach 40/42 °C (104/108 °F). In August 2017, it reached 44 °C (111 °F), and in July 2006, as high as 46 °C (115 °F). It can sometimes be very hot even in late April and early October. However, since the daytime temperature range is very wide, at night it gets generally quite cool even in the height of summer.
to visit Stockton are spring and autumn, to avoid the night-time cold, the fog and the rain of winter, as well as the summer heat. In particular, you can choose the months of April and October, bearing in mind that it is necessary to dress in layers because there are strong temperature differences between night and day.
. Here are the average temperatures.
January is generally a mild month. The average temperature is of
8.9 °C, with a minimum of
3.9 °C and a maximum of
13.9 °C.

On the coldest nights of the month, the temperature usually drops to around
-2 °C. However, it dropped to
-7 °C in January 2007.

On the warmest days of the month, the temperature usually reaches around
19 °C. However, it reached
23.9 °C in January 2012.

Precipitation amounts to
70 mm, distributed over 10 days.
The day lasts on average 9 hours and 55 minutes.
The average humidity is 82%. Hence, the air is normally humid.
The average wind speed is of
10 kph.
February is generally a mild month. The average temperature is of
11.2 °C, with a minimum of
5.2 °C and a maximum of
17.2 °C.

On the coldest nights of the month, the temperature usually drops to around
-0.5 °C. However, it dropped to
-3.3 °C in February 2002.

On the warmest days of the month, the temperature usually reaches around
22 °C. However, it reached
26.1 °C in February 2020.

Precipitation amounts to
65 mm, distributed over 9 days.
The day lasts on average 10 hours and 50 minutes.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is of
11.4 kph.
March is generally a mild month. However, there are remarkable differences between night and day. The average temperature is of
13.5 °C, with a minimum of
6.8 °C and a maximum of
20.3 °C.

On the coldest nights of the month, the temperature usually drops to around
2 °C. However, it dropped to
0 °C in March 2002.

On the warmest days of the month, the temperature usually reaches around
26 °C. However, it reached
30.6 °C in March 2007.

Precipitation amounts to
50 mm, distributed over 9 days.
The day lasts on average 12 hours and 0 minutes.
The average humidity is 68%.
The average wind speed is of
11.9 kph.
April is generally a very mild month. However, there are remarkable differences between night and day. The average temperature is of
16.1 °C, with a minimum of
8.6 °C and a maximum of
23.6 °C.

On the coldest nights of the month, the temperature usually drops to around
3.5 °C. However, it dropped to
0 °C in April 2001.

On the warmest days of the month, the temperature usually reaches around
32 °C. However, it reached
36.1 °C in April 2009.

Precipitation amounts to
30 mm, distributed over 5 days.
The day lasts on average 13 hours and 10 minutes.
The average humidity is 58%.
The average wind speed is of
14.1 kph.
May is generally a warm month. However, there are remarkable differences between night and day. The average temperature is of
19.8 °C, with a minimum of
11.4 °C and a maximum of
28.2 °C.

On the coldest nights of the month, the temperature usually drops to around
6.5 °C. However, it dropped to
3.3 °C in May 2010.

On the warmest days of the month, the temperature usually reaches around
36 °C. However, it reached
41.7 °C in May 2001.

Precipitation amounts to
15 mm, distributed over 3 days.
The day lasts on average 14 hours and 20 minutes. So the days are long.
The average humidity is 52%.
The average wind speed is of
15.5 kph.
June is generally a warm to hot month. However, there are remarkable differences between night and day. The average temperature is of
23.3 °C, with a minimum of
14.2 °C and a maximum of
32.4 °C.

On the coldest nights of the month, the temperature usually drops to around
10 °C. However, it dropped to
6.7 °C in June 2018.

On the warmest days of the month, the temperature usually reaches around
40 °C. However, it reached
43.3 °C in June 2009.

Precipitation amounts to only
5 mm, and all occurs in one day.
The day lasts on average 14 hours and 50 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
The average humidity is 46%.
The average wind speed is of
15.7 kph.
July, the hottest month of the year, is generally a warm to hot month. However, there are remarkable differences between night and day. The average temperature is of
25.6 °C, with a minimum of
16.1 °C and a maximum of
35.2 °C.

On the coldest nights of the month, the temperature usually drops to around
12 °C. However, it dropped to
10 °C in July 1999.

On the warmest days of the month, the temperature usually reaches around
41 °C. However, it reached
46.1 °C in July 2006.

Precipitation amounts to only
0 mm, so on average it never rains in the whole month.
The day lasts on average 14 hours and 30 minutes. So the days are long.
The average humidity is 45%.
The average wind speed is of
14 kph.
August is generally a warm to hot month. However, there are remarkable differences between night and day. The average temperature is of
25.2 °C, with a minimum of
15.7 °C and a maximum of
34.7 °C.

On the coldest nights of the month, the temperature usually drops to around
12 °C. However, it dropped to
10 °C in August 2002.

On the warmest days of the month, the temperature usually reaches around
40.5 °C. However, it reached
45 °C in August 2020.

Precipitation amounts to only
0 mm, so on average it never rains in the whole month.
The day lasts on average 13 hours and 30 minutes.
The average humidity is 46%.
The average wind speed is of
13.1 kph.
September is generally a warm to hot month. However, there are remarkable differences between night and day. The average temperature is of
23.3 °C, with a minimum of
14.2 °C and a maximum of
32.4 °C.

On the coldest nights of the month, the temperature usually drops to around
10 °C. However, it dropped to
7 °C in September 2007.

On the warmest days of the month, the temperature usually reaches around
38.5 °C. However, it reached
43.9 °C in September 2020.

Precipitation amounts to only
0 mm, so on average it never rains in the whole month.
The day lasts on average 12 hours and 25 minutes.
The average humidity is 48%.
The average wind speed is of
11.8 kph.
October is generally a warm month. However, there are remarkable differences between night and day. The average temperature is of
18.6 °C, with a minimum of
10.3 °C and a maximum of
26.8 °C.

On the coldest nights of the month, the temperature usually drops to around
5 °C. However, it dropped to
1.7 °C in October 2019.

On the warmest days of the month, the temperature usually reaches around
33.5 °C. However, it reached
38.3 °C in October 2012.

Precipitation amounts to
20 mm, distributed over 3 days.
The day lasts on average 11 hours and 10 minutes.
The average humidity is 53%.
The average wind speed is of
10.1 kph.
November is generally a mild month. However, there are remarkable differences between night and day. The average temperature is of
12.6 °C, with a minimum of
6 °C and a maximum of
19.2 °C.

On the coldest nights of the month, the temperature usually drops to around
0 °C. However, it dropped to
-3.9 °C in November 2015.

On the warmest days of the month, the temperature usually reaches around
25.5 °C. However, it reached
29.4 °C in November 2015.

Precipitation amounts to
35 mm, distributed over 6 days.
The day lasts on average 10 hours and 5 minutes.
The average humidity is 70%. Hence, the air is normally humid.
The average wind speed is of
8.9 kph.
December, the coldest month of the year, is generally a mild month. The average temperature is of
8.8 °C, with a minimum of
3.6 °C and a maximum of
13.9 °C.

On the coldest nights of the month, the temperature usually drops to around
-2 °C. However, it dropped to
-6 °C in December 1998.

On the warmest days of the month, the temperature usually reaches around
19 °C. However, it reached
24.4 °C in December 2020.

Precipitation amounts to
60 mm, distributed over 9 days.
The day lasts on average 9 hours and 35 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
The average humidity is 79%. Hence, the air is normally humid.
The average wind speed is of
10.6 kph.