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Mammoth Lakes, California climate
Csb Warm-summer Mediterranean
Mammoth Lakes has a seasonal cold-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is July with an average daily high near 78°F, while the coldest is February averaging around 17°F at night. Precipitation totals about 22 inches a year and is strongly seasonal — December alone averages 3.7 inches while September barely receives 0.36 inches. Snowfall is heavy (176 inches of snow per year on average).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 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)Mammoth Lakes climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 41 | 41 | 46 | 51 | 60 | 70 | 78 | 77 | 71 | 60 | 49 | 41 |
| Avg temp (°F) | 29 | 29 | 34 | 39 | 47 | 56 | 63 | 62 | 55 | 45 | 36 | 29 |
| Avg low (°F) | 17 | 17 | 22 | 26 | 34 | 41 | 48 | 46 | 40 | 30 | 23 | 17 |
| Precipitation (in) | 3.5 | 3.3 | 2.6 | 1.4 | 1.3 | 0.5 | 0.6 | 0.5 | 0.4 | 1.6 | 2.3 | 3.7 |
| Snowfall (in) | 33.9 | 38.6 | 28.3 | 14.7 | 4.1 | 0.4 | — | — | 0.1 | 5.2 | 12.6 | 38.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 41 | 41 | 46 | 51 | 60 | 70 |
| Avg temp (°F) | 29 | 29 | 34 | 39 | 47 | 56 |
| Avg low (°F) | 17 | 17 | 22 | 26 | 34 | 41 |
| Precipitation (in) | 3.5 | 3.3 | 2.6 | 1.4 | 1.3 | 0.5 |
| Snowfall (in) | 33.9 | 38.6 | 28.3 | 14.7 | 4.1 | 0.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 78 | 77 | 71 | 60 | 49 | 41 |
| Avg temp (°F) | 63 | 62 | 55 | 45 | 36 | 29 |
| Avg low (°F) | 48 | 46 | 40 | 30 | 23 | 17 |
| Precipitation (in) | 0.6 | 0.5 | 0.4 | 1.6 | 2.3 | 3.7 |
| Snowfall (in) | — | — | 0.1 | 5.2 | 12.6 | 38.6 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 7 | 8 | 6 | 6 | 5 | 2 | 3 | 2 | 2 | 4 | 5 | 7 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | — | 0.2 | — | — | — | — | — |
| Days with low ≤ 32°F (days) | 27 | 25 | 24 | 20 | 12 | 3 | 0.1 | 0.1 | 4 | 18 | 22 | 26 |
| Days with snowfall ≥ 1 in (days) | 6 | 6 | 5 | 4 | 1 | 0.1 | — | — | 0.1 | 1 | 3 | 6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 7 | 8 | 6 | 6 | 5 | 2 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | — |
| Days with low ≤ 32°F (days) | 27 | 25 | 24 | 20 | 12 | 3 |
| Days with snowfall ≥ 1 in (days) | 6 | 6 | 5 | 4 | 1 | 0.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 3 | 2 | 2 | 4 | 5 | 7 |
| Days with high ≥ 90°F (days) | 0.2 | — | — | — | — | — |
| Days with low ≤ 32°F (days) | 0.1 | 0.1 | 4 | 18 | 22 | 26 |
| Days with snowfall ≥ 1 in (days) | — | — | 0.1 | 1 | 3 | 6 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 56 | 59 | 57 | 54 | 52 | 36 | 35 | 28 | 26 | 33 | 45 | 54 |
| Relative humidity (%) | 70 | 73 | 72 | 65 | 58 | 45 | 40 | 35 | 38 | 44 | 55 | 68 |
| Wind speed (mph) | 4.9 | 5.5 | 5.8 | 6.2 | 5.7 | 5.5 | 4.6 | 4.6 | 4.5 | 4.6 | 5.0 | 5.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 56 | 59 | 57 | 54 | 52 | 36 |
| Relative humidity (%) | 70 | 73 | 72 | 65 | 58 | 45 |
| Wind speed (mph) | 4.9 | 5.5 | 5.8 | 6.2 | 5.7 | 5.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 35 | 28 | 26 | 33 | 45 | 54 |
| Relative humidity (%) | 40 | 35 | 38 | 44 | 55 | 68 |
| Wind speed (mph) | 4.6 | 4.6 | 4.5 | 4.6 | 5.0 | 5.1 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 24 years of daily observations at Mammoth Lakes RS, a weather station, inside the city. 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.