Stockton climate
Stockton (California, United States) has a hot-summer Mediterranean climate (Köppen Csa). The average temperature over the year is 17 °C63 °F, and about 449 mm18 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Stockton climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 1458 | 540 | 949 | 763.0 | 2 |
| Feb | 1661 | 542 | 1151 | 752.9 | 1 |
| Mar | 1966 | 744 | 1355 | 682.7 | 0 |
| Apr | 2271 | 846 | 1559 | 391.5 | 0 |
| May | 2781 | 1051 | 1966 | 160.6 | 0 |
| Jun | 3391 | 1355 | 2373 | 40.1 | 0 |
| Jul | 3697 | 1559 | 2578 | 00.0 | 0 |
| Aug | 3595 | 1458 | 2577 | 10.0 | 0 |
| Sep | 3290 | 1457 | 2373 | 30.1 | 0 |
| Oct | 2679 | 1152 | 1966 | 230.9 | 0 |
| Nov | 1966 | 745 | 1356 | 471.8 | 0 |
| Dec | 1457 | 540 | 949 | 983.9 | 2 |
| Year | 3697 | 540 | 1763 | 44918 | 6 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 78% | 54% | 2.4 | 9:48 |
| Feb | 77% | 50% | 3.5 | 10:44 |
| Mar | 76% | 48% | 4.8 | 11:51 |
| Apr | 70% | 41% | 6.2 | 13:08 |
| May | 60% | 29% | 7.5 | 14:12 |
| Jun | 49% | 16% | 8.3 | 14:47 |
| Jul | 44% | 12% | 8.2 | 14:33 |
| Aug | 46% | 12% | 7.4 | 13:37 |
| Sep | 48% | 14% | 6.0 | 12:22 |
| Oct | 53% | 26% | 4.4 | 11:08 |
| Nov | 64% | 41% | 2.9 | 10:04 |
| Dec | 74% | 54% | 2.2 | 9:32 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Stockton is like
The warmest month is July, with an average high of 36 °C97 °F and a low of 15 °C59 °F. The coldest is December, when highs average 14 °C57 °F and lows 5 °C40 °F. There is a clear seasonal cycle, with 16.2 °C29.1 °F between the average temperature of the warmest and the coolest month.
Annual precipitation is moderate at about 449 mm18 in. The wettest three-month stretch is December–February, which brings 55% of the annual total. Months with less than 20 mm0.8 in on average: May–September. The wettest month is December (98 mm3.9 in), the driest is July (0 mm0.0 in).
Relative humidity ranges from 44% in July to 78% in January. The clearest skies (lowest average cloud amount, 12%) are typical of July. Average wind speed near the ground ranges from 6 km/h (4 mph) in November to 11 km/h (7 mph) in July. Daylight lasts from about 9.5 hours in December to 14.8 hours in June.
Best time to visit Stockton
Based on these averages, the most comfortable months for sightseeing and outdoor activities are March–May and October and November: average highs of 19 °C66 °F to 27 °C81 °F with 16 mm0.6 in to 68 mm2.7 in of precipitation per month.
The most challenging month is July, which is hot, with average highs of 36 °C97 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Stockton
- Winter (December–February) — highs 1457 to 16 °C61 °F, lows around 5 °C40 °F, about 83 mm3.3 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket.
- Spring (March–May) — highs 1966 to 27 °C81 °F, lows 744 to 10 °C51 °F, about 41 mm1.6 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
- Summer (June–August) — highs 3391 to 36 °C97 °F, lows 1355 to 15 °C59 °F, about 2 mm0.1 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and an extra layer for the cooler mornings and evenings.
- Autumn (September–November) — highs 1966 to 32 °C90 °F, lows 745 to 14 °C57 °F, about 24 mm1.0 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
How Stockton compares
Compared with Sacramento, about 72 km to the north, Stockton is on average 0.4 °C0.8 °F cooler and receives 21% less precipitation (449 mm18 in vs 567 mm22 in). The difference is largest in August (0.9 °C1.6 °F cooler).
Of the 222 places in the United States covered by World Climates, Stockton is the 81st warmest by annual mean temperature and the 176th wettest by annual precipitation. See all of them on the United States climate page.
Places in other countries with the most similar temperature and rainfall pattern: Jerusalem (Israel, Csa), Irbid (Jordan, Csa) and Nablus (Palestine, Csa).
Nearby places
- Modesto 44 km · 17 °C63 °F · 421 mm17 in
- Antioch 45 km · 15 °C60 °F · 467 mm18 in
- Concord 65 km · 15 °C59 °F · 467 mm18 in
- Sacramento 72 km · 17 °C63 °F · 567 mm22 in
- Fairfield 73 km · 15 °C60 °F · 467 mm18 in
- Hayward 76 km · 15 °C59 °F · 511 mm20 in
- Vallejo 86 km · 14 °C57 °F · 586 mm23 in
- San Jose 87 km · 15 °C60 °F · 511 mm20 in
Frequently asked questions
What is the warmest month in Stockton?
July is the warmest month in Stockton, with an average high of 36 °C (97 °F) and an average low of 15 °C (59 °F).
What is the coldest month in Stockton?
December is the coldest month, with an average high of 14 °C (57 °F) and an average low of 5 °C (40 °F).
When does it rain the most in Stockton?
December is the wettest month with about 98 mm (3.9 in) of precipitation; July is the driest with about 0 mm (0.0 in).
What is the best time to visit Stockton?
Judging by long-term averages, the most comfortable months are March–May and October and November.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 98 m, while Stockton lies at about 4 m. Temperatures on this page were therefore adjusted by +0.6 °C1.1 °F using the standard lapse rate of 6.5 °C per 1,000 m.