Home › Cities › United States › California › Mount Shasta
Mount Shasta, California climate
Csb Warm-summer Mediterranean
Mount Shasta has a seasonal cool-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is July with an average daily high near 30°C, while the coldest is December averaging around −2°C at night. Precipitation totals about 956 mm a year and is strongly seasonal — December alone averages 168 mm while August barely receives 5 mm.
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)Mount Shasta climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 7 | 8 | 11 | 15 | 20 | 25 | 30 | 29 | 26 | 18 | 10 | 6 |
| Avg temp (°C) | 2 | 3 | 6 | 8 | 13 | 16 | 20 | 20 | 16 | 11 | 5 | 2 |
| Avg low (°C) | −2 | −2 | 0 | 2 | 5 | 8 | 11 | 10 | 7 | 3 | 0 | −2 |
| Precipitation (mm) | 160 | 163 | 142 | 73 | 53 | 28 | 7 | 5 | 13 | 51 | 92 | 168 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 7 | 8 | 11 | 15 | 20 | 25 |
| Avg temp (°C) | 2 | 3 | 6 | 8 | 13 | 16 |
| Avg low (°C) | −2 | −2 | 0 | 2 | 5 | 8 |
| Precipitation (mm) | 160 | 163 | 142 | 73 | 53 | 28 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 29 | 26 | 18 | 10 | 6 |
| Avg temp (°C) | 20 | 20 | 16 | 11 | 5 | 2 |
| Avg low (°C) | 11 | 10 | 7 | 3 | 0 | −2 |
| Precipitation (mm) | 7 | 5 | 13 | 51 | 92 | 168 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 11 | 11 | 10 | 8 | 4 | 2 | 2 | 3 | 5 | 9 | 12 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.5 | 3 | 11 | 9 | 3 | — | — | — |
| Days with low ≤ 0°C (days) | 22 | 20 | 18 | 10 | 2 | 0.2 | — | — | 0.5 | 6 | 18 | 24 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 11 | 11 | 10 | 8 | 4 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.5 | 3 |
| Days with low ≤ 0°C (days) | 22 | 20 | 18 | 10 | 2 | 0.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 2 | 2 | 3 | 5 | 9 | 12 |
| Days with high ≥ 32°C (days) | 11 | 9 | 3 | — | — | — |
| Days with low ≤ 0°C (days) | — | — | 0.5 | 6 | 18 | 24 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 62 | 61 | 63 | 60 | 52 | 35 | 21 | 20 | 26 | 39 | 58 | 63 |
| Relative humidity (%) | 87 | 86 | 82 | 78 | 74 | 62 | 44 | 37 | 41 | 57 | 77 | 87 |
| Wind speed (km/h) | 3.0 | 3.1 | 3.2 | 3.1 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 62 | 61 | 63 | 60 | 52 | 35 |
| Relative humidity (%) | 87 | 86 | 82 | 78 | 74 | 62 |
| Wind speed (km/h) | 3.0 | 3.1 | 3.2 | 3.1 | 3.0 | 3.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 21 | 20 | 26 | 39 | 58 | 63 |
| Relative humidity (%) | 44 | 37 | 41 | 57 | 77 | 87 |
| Wind speed (km/h) | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 | 3.0 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at MT Shasta (NOAA GHCN station USW00024215), inside the city.
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.