Mount Wilson, NV climate
Mount Wilson has chilly winters and warm summers, with very little rain. A typical July afternoon reaches 86°, a January night drops to 21°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Mount Wilson feels like
Winter
Spring
Summer
Fall
Mount Wilson weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 42° | 21° | 1.2" | 26° – 40° |
| February | 44° | 23° | 1.5" | 25° – 41° |
| March | 51° | 28° | 1.4" | 33° – 45° |
| April | 58° | 32° | 1.0" | 39° – 51° |
| May | 68° | 40° | 1.2" | 47° – 59° |
| June | 79° | 50° | 0.6" | 57° – 69° |
| July | 86° | 57° | 1.1" | 68° – 75° |
| August | 84° | 56° | 1.1" | 67° – 74° |
| September | 75° | 47° | 1.0" | 58° – 64° |
| October | 63° | 37° | 1.3" | 43° – 55° |
| November | 50° | 27° | 0.7" | 29° – 45° |
| December | 41° | 21° | 1.1" | 25° – 36° |
| Year | 62° | 36° | 13.2" |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Mount Wilson
Mount Wilson gets 13 inches of rain and melted snow a year. February is the wettest month and June the driest.
About 166 frost-free days a year
In half of years the last 32° night comes by May 2 and the first one by October 17. That leaves about 166 frost-free days for gardens, shorter than 64% of U.S. towns.
Heating and cooling a home in Mount Wilson
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Mount Wilson, 89% of that work is heating and 11% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Mount Wilson compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Mount Wilson averaged 1.6° warmer than the 1900s. The biggest change is in January (+2.8°). The shift is larger than in 74% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Mount Wilson’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 25° to 41°. September is the most reliable, staying within 6°.
Common questions about Mount Wilson’s climate
What is the coldest month in Mount Wilson?
December, with a typical high of 41° and a low of 21°.
What is the hottest month in Mount Wilson?
July, with a typical high of 86° and a low of 57°. About 22 days a year reach 90°.
When is the first frost in Mount Wilson?
In half of years the first 32° night comes by October 17, and the last spring frost by May 2.
What is the rainiest month in Mount Wilson?
February, with 1.5 inches of rain and melted snow. The year totals 13 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Mount Wilson itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Pioche, NV (21 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.