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Atwater, California climate
BSk Cold semi-arid
Atwater has a seasonal mild-temperate climate (Cold semi-arid, Köppen BSk). The hottest month is July with an average daily high near 93°F, while the coldest is December averaging around 42°F at night. Precipitation totals about 12 inches a year and is strongly seasonal — January alone averages 2.6 inches while July barely receives 0.00 inches.
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 countsAtwater climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 55 | 61 | 67 | 72 | 80 | 88 | 93 | 92 | 88 | 77 | 64 | 55 |
| Avg temp (°F) | 49 | 53 | 58 | 62 | 69 | 75 | 79 | 78 | 75 | 66 | 56 | 48 |
| Avg low (°F) | 42 | 45 | 49 | 52 | 57 | 62 | 66 | 65 | 62 | 55 | 47 | 42 |
| Precipitation (in) | 2.6 | 2.3 | 1.9 | 0.9 | 0.6 | 0.1 | 0.0 | 0.0 | 0.0 | 0.6 | 1.1 | 2.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 55 | 61 | 67 | 72 | 80 | 88 |
| Avg temp (°F) | 49 | 53 | 58 | 62 | 69 | 75 |
| Avg low (°F) | 42 | 45 | 49 | 52 | 57 | 62 |
| Precipitation (in) | 2.6 | 2.3 | 1.9 | 0.9 | 0.6 | 0.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 93 | 92 | 88 | 77 | 64 | 55 |
| Avg temp (°F) | 79 | 78 | 75 | 66 | 56 | 48 |
| Avg low (°F) | 66 | 65 | 62 | 55 | 47 | 42 |
| Precipitation (in) | 0.0 | 0.0 | 0.0 | 0.6 | 1.1 | 2.3 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 10 | 8 | 5 | 3 | 0.9 | 0.1 | 0.2 | 0.5 | 2 | 5 | 9 |
| Days with high ≥ 90°F (days) | — | — | — | 0.6 | 5 | 13 | 22 | 20 | 13 | 2 | — | — |
| Days with low ≤ 32°F (days) | 2 | 0.5 | — | — | — | — | — | — | — | — | 0.5 | 3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 10 | 8 | 5 | 3 | 0.9 |
| Days with high ≥ 90°F (days) | — | — | — | 0.6 | 5 | 13 |
| Days with low ≤ 32°F (days) | 2 | 0.5 | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 0.1 | 0.2 | 0.5 | 2 | 5 | 9 |
| Days with high ≥ 90°F (days) | 22 | 20 | 13 | 2 | — | — |
| Days with low ≤ 32°F (days) | — | — | — | — | 0.5 | 3 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 59 | 53 | 49 | 40 | 31 | 18 | 13 | 12 | 15 | 26 | 44 | 56 |
| Clear days (≤ 30% cloud) | 7 | 8 | 11 | 14 | 19 | 24 | 27 | 27 | 24 | 21 | 12 | 7 |
| Partly cloudy days (30–70%) | 11 | 9 | 9 | 9 | 8 | 4 | 4 | 3 | 4 | 7 | 10 | 12 |
| Cloudy days (≥ 70%) | 13 | 10 | 10 | 7 | 5 | 2 | 0.8 | 0.8 | 1 | 4 | 8 | 12 |
| Relative humidity (%) | 73 | 75 | 73 | 66 | 55 | 41 | 32 | 33 | 36 | 44 | 59 | 69 |
| Wind speed (mph) | 3.5 | 3.9 | 3.8 | 4.7 | 5.3 | 5.9 | 5.8 | 5.2 | 4.3 | 3.8 | 3.5 | 3.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 59 | 53 | 49 | 40 | 31 | 18 |
| Clear days (≤ 30% cloud) | 7 | 8 | 11 | 14 | 19 | 24 |
| Partly cloudy days (30–70%) | 11 | 9 | 9 | 9 | 8 | 4 |
| Cloudy days (≥ 70%) | 13 | 10 | 10 | 7 | 5 | 2 |
| Relative humidity (%) | 73 | 75 | 73 | 66 | 55 | 41 |
| Wind speed (mph) | 3.5 | 3.9 | 3.8 | 4.7 | 5.3 | 5.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 13 | 12 | 15 | 26 | 44 | 56 |
| Clear days (≤ 30% cloud) | 27 | 27 | 24 | 21 | 12 | 7 |
| Partly cloudy days (30–70%) | 4 | 3 | 4 | 7 | 10 | 12 |
| Cloudy days (≥ 70%) | 0.8 | 0.8 | 1 | 4 | 8 | 12 |
| Relative humidity (%) | 32 | 33 | 36 | 44 | 59 | 69 |
| Wind speed (mph) | 5.8 | 5.2 | 4.3 | 3.8 | 3.5 | 3.7 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Turlock #2 (NOAA GHCN station USC00049073), about 27 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.