Los Alamos, CA climate
Los Alamos has mild winters and pleasant summers, with very little rain. A typical July afternoon reaches 84°, a January night drops to 40°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Los Alamos feels like
Winter
Spring
Summer
Fall
Los Alamos weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 65° | 40° | 3.7" | 0 | 8 | 0 | 49° – 58° |
| February | 65° | 41° | 3.9" | 0 | 9 | 0 | 48° – 58° |
| March | 68° | 43° | 3.0" | 0 | 6 | 0 | 49° – 61° |
| April | 71° | 45° | 1.1" | 0 | 3 | 0 | 54° – 62° |
| May | 75° | 49° | 0.3" | 0 | 2 | 0 | 58° – 67° |
| June | 79° | 52° | 0.0" | 0 | 1 | 0 | 62° – 69° |
| July | 84° | 56° | 0.0" | 0 | 0 | 0 | 67° – 73° |
| August | 84° | 56° | 0.0" | 0 | 0 | 0 | 67° – 73° |
| September | 83° | 54° | 0.1" | 0 | 0 | 0 | 65° – 74° |
| October | 78° | 49° | 0.7" | 0 | 2 | 0 | 60° – 70° |
| November | 71° | 43° | 1.4" | 0 | 4 | 0 | 50° – 61° |
| December | 64° | 39° | 2.5" | 0 | 6 | 0 | 48° – 55° |
| Year | 74° | 47° | 16.7" | 0.0" | 41 | 0 |
“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 Los Alamos
Los Alamos gets 17 inches of rain and melted snow a year. February is the wettest month and August the driest. Rain or snow falls on about 41 days a year.
How Los Alamos 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 Los Alamos averaged 2.3° warmer than the 1900s. The biggest change is in January (+3.0°). The shift is larger than in 99% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Los Alamos’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. March swings the most: between 1991 and 2020 its average temperature ranged from 49° to 61°. August is the most reliable, staying within 6°.
Common questions about Los Alamos’s climate
What is the coldest month in Los Alamos?
December, with a typical high of 64° and a low of 39°.
What is the hottest month in Los Alamos?
August, with a typical high of 84° and a low of 56°.
How much snow does Los Alamos get?
Almost none. A normal year brings 0.0 inches.
What is the rainiest month in Los Alamos?
February, with 3.9 inches of rain and melted snow. The year totals 17 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Los Alamos itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Los Alamos, CA (1 mi, snow). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.