Fort Irwin, CA climate
Fort Irwin has mild winters and scorching summers, with very little rain. A typical July afternoon reaches 103°, a January night drops to 37°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Fort Irwin feels like
Winter
Spring
Summer
Fall
Fort Irwin 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 | 59° | 37° | 1.0" | 44° – 54° |
| February | 63° | 40° | 1.2" | 45° – 59° |
| March | 70° | 46° | 0.7" | 51° – 64° |
| April | 77° | 51° | 0.2" | 58° – 68° |
| May | 87° | 59° | 0.1" | 64° – 80° |
| June | 97° | 68° | 0.0" | 76° – 88° |
| July | 103° | 75° | 0.2" | 84° – 93° |
| August | 101° | 74° | 0.2" | 84° – 91° |
| September | 94° | 67° | 0.2" | 76° – 85° |
| October | 81° | 55° | 0.3" | 64° – 74° |
| November | 68° | 44° | 0.4" | 47° – 62° |
| December | 57° | 36° | 0.8" | 43° – 52° |
| Year | 80° | 54° | 5.2" |
“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 Fort Irwin
Fort Irwin gets 5 inches of rain and melted snow a year. February is the wettest month and June the driest.
How Fort Irwin 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 Fort Irwin averaged 2.2° warmer than the 1900s. The biggest change is in September (+3.2°). The shift is larger than in 98% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Fort Irwin’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. May swings the most: between 1991 and 2020 its average temperature ranged from 64° to 80°. August is the most reliable, staying within 7°.
Common questions about Fort Irwin’s climate
What is the coldest month in Fort Irwin?
December, with a typical high of 57° and a low of 36°.
What is the hottest month in Fort Irwin?
July, with a typical high of 103° and a low of 75°.
What is the rainiest month in Fort Irwin?
February, with 1.2 inches of rain and melted snow. The year totals 5 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Fort Irwin itself (about a 3-mile square). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.