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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 85°F, while the coldest is December averaging around 28°F at night. Precipitation totals about 38 inches a year and is strongly seasonal — December alone averages 6.6 inches while August barely receives 0.20 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)Mount Shasta climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 44 | 47 | 53 | 59 | 69 | 76 | 85 | 85 | 78 | 65 | 51 | 42 |
| Avg temp (°F) | 36 | 38 | 42 | 47 | 55 | 62 | 68 | 67 | 62 | 51 | 41 | 35 |
| Avg low (°F) | 29 | 29 | 32 | 35 | 41 | 47 | 52 | 50 | 45 | 38 | 31 | 28 |
| Precipitation (in) | 6.3 | 6.4 | 5.6 | 2.9 | 2.1 | 1.1 | 0.3 | 0.2 | 0.5 | 2.0 | 3.6 | 6.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 44 | 47 | 53 | 59 | 69 | 76 |
| Avg temp (°F) | 36 | 38 | 42 | 47 | 55 | 62 |
| Avg low (°F) | 29 | 29 | 32 | 35 | 41 | 47 |
| Precipitation (in) | 6.3 | 6.4 | 5.6 | 2.9 | 2.1 | 1.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 85 | 85 | 78 | 65 | 51 | 42 |
| Avg temp (°F) | 68 | 67 | 62 | 51 | 41 | 35 |
| Avg low (°F) | 52 | 50 | 45 | 38 | 31 | 28 |
| Precipitation (in) | 0.3 | 0.2 | 0.5 | 2.0 | 3.6 | 6.6 |
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 ≥ 90°F (days) | — | — | — | — | 0.5 | 3 | 11 | 9 | 3 | — | — | — |
| Days with low ≤ 32°F (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 ≥ 90°F (days) | — | — | — | — | 0.5 | 3 |
| Days with low ≤ 32°F (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 ≥ 90°F (days) | 11 | 9 | 3 | — | — | — |
| Days with low ≤ 32°F (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 (mph) | 1.9 | 1.9 | 2.0 | 1.9 | 1.9 | 1.9 | 1.8 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 |
| 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 (mph) | 1.9 | 1.9 | 2.0 | 1.9 | 1.9 | 1.9 |
| 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 (mph) | 1.8 | 1.9 | 1.9 | 1.9 | 1.9 | 1.9 |
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.