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Folsom, California climate
Csa Hot-summer Mediterranean
Folsom has a seasonal mild-temperate climate (Hot-summer Mediterranean, Köppen Csa). The hottest month is July with an average daily high near 35°C, while the coldest is December averaging around 5°C at night. Precipitation totals about 488 mm a year and is strongly seasonal — January alone averages 98 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 countsFolsom climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 14 | 17 | 20 | 23 | 27 | 32 | 35 | 34 | 32 | 26 | 19 | 14 |
| Avg temp (°C) | 9 | 12 | 14 | 16 | 20 | 23 | 26 | 25 | 23 | 19 | 13 | 9 |
| Avg low (°C) | 5 | 7 | 8 | 10 | 12 | 15 | 16 | 16 | 15 | 12 | 7 | 5 |
| Precipitation (mm) | 98 | 92 | 72 | 37 | 22 | 5 | 0 | 1 | 4 | 24 | 45 | 89 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 14 | 17 | 20 | 23 | 27 | 32 |
| Avg temp (°C) | 9 | 12 | 14 | 16 | 20 | 23 |
| Avg low (°C) | 5 | 7 | 8 | 10 | 12 | 15 |
| Precipitation (mm) | 98 | 92 | 72 | 37 | 22 | 5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 35 | 34 | 32 | 26 | 19 | 14 |
| Avg temp (°C) | 26 | 25 | 23 | 19 | 13 | 9 |
| Avg low (°C) | 16 | 16 | 15 | 12 | 7 | 5 |
| Precipitation (mm) | 0 | 1 | 4 | 24 | 45 | 89 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 10 | 9 | 5 | 4 | 1 | 0.1 | 0.2 | 0.8 | 3 | 7 | 10 |
| Days with high ≥ 32°C (days) | — | — | — | 1 | 7 | 15 | 24 | 23 | 16 | 4 | — | — |
| Days with low ≤ 0°C (days) | 2 | 0.3 | — | — | — | — | — | — | — | — | 0.3 | 2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 10 | 9 | 5 | 4 | 1 |
| Days with high ≥ 32°C (days) | — | — | — | 1 | 7 | 15 |
| Days with low ≤ 0°C (days) | 2 | 0.3 | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 0.1 | 0.2 | 0.8 | 3 | 7 | 10 |
| Days with high ≥ 32°C (days) | 24 | 23 | 16 | 4 | — | — |
| Days with low ≤ 0°C (days) | — | — | — | — | 0.3 | 2 |
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 (%) | 74 | 76 | 76 | 71 | 62 | 50 | 41 | 41 | 42 | 47 | 59 | 70 |
| Wind speed (mph) | 4.1 | 4.5 | 4.1 | 4.2 | 4.6 | 5.1 | 5.4 | 5.0 | 4.2 | 3.7 | 3.7 | 4.4 |
| 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 (%) | 74 | 76 | 76 | 71 | 62 | 50 |
| Wind speed (mph) | 4.1 | 4.5 | 4.1 | 4.2 | 4.6 | 5.1 |
| 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 (%) | 41 | 41 | 42 | 47 | 59 | 70 |
| Wind speed (mph) | 5.4 | 5.0 | 4.2 | 3.7 | 3.7 | 4.4 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Sacramento 5 Ese (NOAA GHCN station USW00023271), about 25 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.