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Three Rivers, California climate
Csa Hot-summer Mediterranean
Three Rivers has a seasonal mild-temperate climate (Hot-summer Mediterranean, Köppen Csa). The hottest month is July with an average daily high near 99°F, while the coldest is December averaging around 37°F at night. Precipitation totals about 24 inches a year and is strongly seasonal — February alone averages 4.7 inches while August barely receives 0.03 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Three Rivers climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 60 | 62 | 66 | 71 | 81 | 91 | 99 | 98 | 93 | 81 | 68 | 59 |
| Avg temp (°F) | 49 | 51 | 54 | 58 | 67 | 76 | 83 | 83 | 77 | 66 | 55 | 48 |
| Avg low (°F) | 37 | 39 | 42 | 45 | 53 | 61 | 68 | 67 | 61 | 52 | 43 | 37 |
| Precipitation (in) | 4.6 | 4.7 | 3.9 | 2.0 | 1.1 | 0.4 | 0.1 | 0.0 | 0.2 | 1.3 | 2.2 | 3.8 |
| Snowfall (in) | 0.1 | — | 0.1 | — | — | — | — | — | — | — | 0.0 | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 60 | 62 | 66 | 71 | 81 | 91 |
| Avg temp (°F) | 49 | 51 | 54 | 58 | 67 | 76 |
| Avg low (°F) | 37 | 39 | 42 | 45 | 53 | 61 |
| Precipitation (in) | 4.6 | 4.7 | 3.9 | 2.0 | 1.1 | 0.4 |
| Snowfall (in) | 0.1 | — | 0.1 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 99 | 98 | 93 | 81 | 68 | 59 |
| Avg temp (°F) | 83 | 83 | 77 | 66 | 55 | 48 |
| Avg low (°F) | 68 | 67 | 61 | 52 | 43 | 37 |
| Precipitation (in) | 0.1 | 0.0 | 0.2 | 1.3 | 2.2 | 3.8 |
| Snowfall (in) | — | — | — | — | 0.0 | — |
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 | 9 | 6 | 4 | 1 | 0.8 | 0.4 | 1 | 3 | 6 | 8 |
| Days with high ≥ 90°F (days) | — | — | — | 0.6 | 6 | 17 | 27 | 27 | 19 | 6 | 0.0 | — |
| Days with low ≤ 32°F (days) | 6 | 4 | 2 | 1.0 | 0.0 | — | 0.0 | — | — | 0.1 | 2 | 6 |
| Days with snowfall ≥ 1 in (days) | 0.1 | — | 0.0 | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 10 | 9 | 6 | 4 | 1 |
| Days with high ≥ 90°F (days) | — | — | — | 0.6 | 6 | 17 |
| Days with low ≤ 32°F (days) | 6 | 4 | 2 | 1.0 | 0.0 | — |
| Days with snowfall ≥ 1 in (days) | 0.1 | — | 0.0 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 0.8 | 0.4 | 1 | 3 | 6 | 8 |
| Days with high ≥ 90°F (days) | 27 | 27 | 19 | 6 | 0.0 | — |
| Days with low ≤ 32°F (days) | 0.0 | — | — | 0.1 | 2 | 6 |
| Days with snowfall ≥ 1 in (days) | — | — | — | — | — | — |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 60 | 60 | 56 | 51 | 33 | 31 | 27 | 28 | 34 | 46 | 54 |
| Relative humidity (%) | 62 | 66 | 65 | 61 | 54 | 40 | 31 | 29 | 33 | 40 | 50 | 58 |
| Wind speed (mph) | 1.2 | 1.2 | 1.2 | 1.2 | 1.1 | 1.1 | 1.0 | 1.1 | 1.1 | 1.1 | 1.2 | 1.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 60 | 60 | 56 | 51 | 33 |
| Relative humidity (%) | 62 | 66 | 65 | 61 | 54 | 40 |
| Wind speed (mph) | 1.2 | 1.2 | 1.2 | 1.2 | 1.1 | 1.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 31 | 27 | 28 | 34 | 46 | 54 |
| Relative humidity (%) | 31 | 29 | 33 | 40 | 50 | 58 |
| Wind speed (mph) | 1.0 | 1.1 | 1.1 | 1.1 | 1.2 | 1.2 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Ash Mtn, a weather station, about 9 km from the city centre. The underlying daily records come from NOAA's global station network.
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.