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Stockton, California climate
Csa Hot-summer Mediterranean
Stockton has a seasonal mild-temperate climate (Hot-summer Mediterranean, Köppen Csa). The hottest month is July with an average daily high near 34°C, while the coldest is December averaging around 4°C at night. Precipitation totals about 467 mm a year and is strongly seasonal — December alone averages 92 mm while July barely receives 0 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsStockton climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 14 | 17 | 20 | 23 | 27 | 31 | 34 | 33 | 31 | 26 | 19 | 14 |
| Avg temp (°C) | 9 | 11 | 14 | 16 | 19 | 23 | 24 | 24 | 22 | 18 | 12 | 9 |
| Avg low (°C) | 4 | 5 | 7 | 9 | 11 | 14 | 15 | 15 | 13 | 10 | 6 | 4 |
| Precipitation (mm) | 89 | 87 | 63 | 39 | 17 | 5 | 0 | 1 | 3 | 24 | 47 | 92 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 14 | 17 | 20 | 23 | 27 | 31 |
| Avg temp (°C) | 9 | 11 | 14 | 16 | 19 | 23 |
| Avg low (°C) | 4 | 5 | 7 | 9 | 11 | 14 |
| Precipitation (mm) | 89 | 87 | 63 | 39 | 17 | 5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 34 | 33 | 31 | 26 | 19 | 14 |
| Avg temp (°C) | 24 | 24 | 22 | 18 | 12 | 9 |
| Avg low (°C) | 15 | 15 | 13 | 10 | 6 | 4 |
| Precipitation (mm) | 0 | 1 | 3 | 24 | 47 | 92 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 9 | 8 | 5 | 3 | 1 | 0.1 | 0.4 | 0.7 | 3 | 6 | 10 |
| Days with high ≥ 32°C (days) | — | — | — | 0.9 | 5 | 10 | 18 | 15 | 12 | 2 | — | — |
| Days with low ≤ 0°C (days) | 6 | 2 | 0.4 | 0.1 | 0.0 | 0.0 | — | — | — | — | 2 | 7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 9 | 8 | 5 | 3 | 1 |
| Days with high ≥ 32°C (days) | — | — | — | 0.9 | 5 | 10 |
| Days with low ≤ 0°C (days) | 6 | 2 | 0.4 | 0.1 | 0.0 | 0.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 0.1 | 0.4 | 0.7 | 3 | 6 | 10 |
| Days with high ≥ 32°C (days) | 18 | 15 | 12 | 2 | — | — |
| Days with low ≤ 0°C (days) | — | — | — | — | 2 | 7 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 60 | 55 | 51 | 44 | 35 | 22 | 14 | 15 | 18 | 31 | 47 | 59 |
| Clear days (≤ 30% cloud) | 7 | 8 | 11 | 13 | 17 | 22 | 27 | 26 | 23 | 19 | 11 | 8 |
| Partly cloudy days (30–70%) | 9 | 9 | 9 | 9 | 8 | 5 | 3 | 4 | 5 | 8 | 10 | 10 |
| Cloudy days (≥ 70%) | 15 | 11 | 11 | 8 | 6 | 3 | 1 | 1 | 2 | 4 | 9 | 13 |
| Relative humidity (%) | 78 | 78 | 77 | 71 | 61 | 50 | 44 | 46 | 48 | 53 | 64 | 73 |
| Wind speed (m/s) | 1.7 | 1.9 | 1.9 | 2.2 | 2.5 | 2.9 | 2.9 | 2.7 | 2.2 | 1.8 | 1.7 | 1.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 60 | 55 | 51 | 44 | 35 | 22 |
| Clear days (≤ 30% cloud) | 7 | 8 | 11 | 13 | 17 | 22 |
| Partly cloudy days (30–70%) | 9 | 9 | 9 | 9 | 8 | 5 |
| Cloudy days (≥ 70%) | 15 | 11 | 11 | 8 | 6 | 3 |
| Relative humidity (%) | 78 | 78 | 77 | 71 | 61 | 50 |
| Wind speed (m/s) | 1.7 | 1.9 | 1.9 | 2.2 | 2.5 | 2.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 14 | 15 | 18 | 31 | 47 | 59 |
| Clear days (≤ 30% cloud) | 27 | 26 | 23 | 19 | 11 | 8 |
| Partly cloudy days (30–70%) | 3 | 4 | 5 | 8 | 10 | 10 |
| Cloudy days (≥ 70%) | 1 | 1 | 2 | 4 | 9 | 13 |
| Relative humidity (%) | 44 | 46 | 48 | 53 | 64 | 73 |
| Wind speed (m/s) | 2.9 | 2.7 | 2.2 | 1.8 | 1.7 | 1.8 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Lodi (NOAA GHCN station USC00045032), about 17 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.