Folsom, CA climate
Folsom has mild winters and hot summers. A typical July afternoon reaches 95°, a January night drops to 38°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Folsom feels like
Winter
Spring
Summer
Fall
Folsom 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 | 56° | 38° | 4.9" | 0 | 10 | 0 | 44° – 53° |
| February | 61° | 41° | 4.4" | 0 | 10 | 0 | 46° – 56° |
| March | 66° | 44° | 3.6" | 0 | 8 | 0 | 48° – 60° |
| April | 72° | 46° | 2.1" | 0 | 5 | 0 | 53° – 63° |
| May | 80° | 51° | 1.1" | 0 | 3 | 0 | 58° – 73° |
| June | 89° | 57° | 0.3" | 0 | 1 | 0 | 67° – 78° |
| July | 95° | 61° | 0.0" | 0 | 0 | 0 | 74° – 82° |
| August | 94° | 60° | 0.0" | 0 | 1 | 0 | 73° – 82° |
| September | 89° | 57° | 0.1" | 0 | 1 | 0 | 69° – 77° |
| October | 79° | 50° | 1.1" | 0 | 2 | 0 | 61° – 70° |
| November | 65° | 43° | 2.4" | 0 | 5 | 0 | 46° – 59° |
| December | 56° | 38° | 4.1" | 0 | 10 | 0 | 43° – 52° |
| Year | 75° | 49° | 24.1" | 0.0" | 55 | 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 Folsom
Folsom gets 24 inches of rain and melted snow a year. January is the wettest month and July the driest. Rain or snow falls on about 55 days a year.
A year-round growing season
Heating and cooling a home in Folsom
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Folsom, 58% of that work is heating and 42% is cooling.
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.
Folsom and its neighbors
Folsom borders 4 towns with climate data. January nights across them vary by 0.5°. Granite Bay has both the coldest January nights (38°) and the hottest July afternoons (96°). Folsom’s January low is 38° and its July high 95°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Folsom 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 Folsom averaged 1.1° warmer than the 1900s. The biggest change is in September (+1.7°). The shift is smaller than in 62% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Folsom’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 58° to 73°. September is the most reliable, staying within 8°.
Common questions about Folsom’s climate
What is the coldest month in Folsom?
January, with a typical high of 56° and a low of 38°.
What is the hottest month in Folsom?
July, with a typical high of 95° and a low of 61°. About 90 days a year reach 90°.
How much snow does Folsom get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Folsom?
Frost is uncommon. Only 81% of years see a night at 32° or below.
What is the rainiest month in Folsom?
January, with 4.9 inches of rain and melted snow. The year totals 24 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Folsom itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Represa, CA (2 mi, snow) and Sacramento 5 Ese, CA (17 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.