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Fairfield, California climate
Csa Hot-summer Mediterranean
Fairfield has a seasonal mild-temperate climate (Hot-summer Mediterranean, Köppen Csa). The hottest month is July with an average daily high near 95°F, while the coldest is December averaging around 37°F at night. Precipitation totals about 25 inches a year and is strongly seasonal — January alone averages 5.3 inches while July barely receives 0.01 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 countsFairfield climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 58 | 63 | 68 | 73 | 81 | 90 | 95 | 94 | 91 | 80 | 67 | 58 |
| Avg temp (°F) | 48 | 52 | 55 | 59 | 66 | 73 | 77 | 76 | 73 | 65 | 54 | 48 |
| Avg low (°F) | 38 | 40 | 43 | 46 | 51 | 56 | 59 | 58 | 56 | 49 | 42 | 37 |
| Precipitation (in) | 5.3 | 5.1 | 3.7 | 1.3 | 0.8 | 0.2 | 0.0 | 0.0 | 0.1 | 1.1 | 2.3 | 5.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 58 | 63 | 68 | 73 | 81 | 90 |
| Avg temp (°F) | 48 | 52 | 55 | 59 | 66 | 73 |
| Avg low (°F) | 38 | 40 | 43 | 46 | 51 | 56 |
| Precipitation (in) | 5.3 | 5.1 | 3.7 | 1.3 | 0.8 | 0.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 95 | 94 | 91 | 80 | 67 | 58 |
| Avg temp (°F) | 77 | 76 | 73 | 65 | 54 | 48 |
| Avg low (°F) | 59 | 58 | 56 | 49 | 42 | 37 |
| Precipitation (in) | 0.0 | 0.0 | 0.1 | 1.1 | 2.3 | 5.1 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 9 | 5 | 3 | 0.9 | 0.1 | 0.2 | 0.9 | 3 | 8 | 10 |
| Days with high ≥ 90°F (days) | — | — | — | 1.0 | 5 | 15 | 23 | 22 | 16 | 4 | — | — |
| Days with low ≤ 32°F (days) | 7 | 3 | 0.4 | 0.1 | — | — | — | — | — | — | 2 | 8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 9 | 5 | 3 | 0.9 |
| Days with high ≥ 90°F (days) | — | — | — | 1.0 | 5 | 15 |
| Days with low ≤ 32°F (days) | 7 | 3 | 0.4 | 0.1 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 0.1 | 0.2 | 0.9 | 3 | 8 | 10 |
| Days with high ≥ 90°F (days) | 23 | 22 | 16 | 4 | — | — |
| Days with low ≤ 32°F (days) | — | — | — | — | 2 | 8 |
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 (%) | 82 | 81 | 79 | 73 | 65 | 53 | 48 | 48 | 45 | 50 | 66 | 77 |
| Wind speed (mph) | 4.3 | 4.6 | 4.5 | 5.0 | 5.4 | 5.8 | 6.3 | 5.9 | 5.0 | 4.5 | 4.3 | 4.7 |
| 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 (%) | 82 | 81 | 79 | 73 | 65 | 53 |
| Wind speed (mph) | 4.3 | 4.6 | 4.5 | 5.0 | 5.4 | 5.8 |
| 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 (%) | 48 | 48 | 45 | 50 | 66 | 77 |
| Wind speed (mph) | 6.3 | 5.9 | 5.0 | 4.5 | 4.3 | 4.7 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Vacaville/nut Tree AP Asos (NOAA GHCN station USW00093241), about 16 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.