Tuolumne, CA climate
Tuolumne has mild winters and warm summers. A typical July afternoon reaches 91°, a January night drops to 32°, and about 4 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Tuolumne feels like
Winter
Spring
Summer
Fall
Tuolumne 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 | 54° | 32° | 7.1" | 0.6" | 10 | 1 | 39° – 48° |
| February | 56° | 34° | 6.4" | 0.6" | 9 | 0 | 39° – 51° |
| March | 60° | 37° | 6.2" | 1.1" | 11 | 1 | 40° – 55° |
| April | 64° | 39° | 3.3" | 0.8" | 7 | 0 | 46° – 57° |
| May | 73° | 45° | 1.7" | 0 | 4 | 0 | 51° – 67° |
| June | 83° | 51° | 0.4" | 0 | 1 | 0 | 62° – 72° |
| July | 91° | 57° | 0.0" | 0 | 0 | 0 | 70° – 78° |
| August | 91° | 56° | 0.0" | 0 | 1 | 0 | 70° – 77° |
| September | 85° | 52° | 0.3" | 0 | 2 | 0 | 64° – 73° |
| October | 74° | 44° | 2.0" | 0 | 4 | 0 | 55° – 66° |
| November | 61° | 36° | 3.9" | 0.5" | 8 | 0 | 39° – 54° |
| December | 53° | 31° | 6.5" | 0.2" | 10 | 0 | 37° – 48° |
| Year | 71° | 43° | 37.8" | 3.8" | 66 | 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 Tuolumne
Tuolumne gets 38 inches of rain and melted snow a year. January is the wettest month and July the driest. Rain or snow falls on about 66 days a year.
About 192 frost-free days a year
In half of years the last 32° night comes by April 22 and the first one by November 2. That leaves about 192 frost-free days for gardens, longer than 66% of U.S. towns.
Heating and cooling a home in Tuolumne
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Tuolumne, 84% of that work is heating and 16% 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.
Tuolumne and its neighbors
Tuolumne borders 1 town with climate data. January nights across them vary by 1.3°. Soulsbyville has both the coldest January nights (33°) and the hottest July afternoons (90°). Tuolumne’s January low is 32° and its July high 91°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Tuolumne 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 Tuolumne averaged 1.0° warmer than the 1900s. The biggest change is in January (+2.1°). The shift is smaller than in 73% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Tuolumne’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 51° to 67°. August is the most reliable, staying within 8°.
Common questions about Tuolumne’s climate
What is the coldest month in Tuolumne?
December, with a typical high of 53° and a low of 31°.
What is the hottest month in Tuolumne?
July, with a typical high of 91° and a low of 57°. About 59 days a year reach 90°.
How much snow does Tuolumne get?
About 4 inches in a normal winter, most of it in March.
When is the first frost in Tuolumne?
In half of years the first 32° night comes by November 2, and the last spring frost by April 22.
What is the rainiest month in Tuolumne?
January, with 7.1 inches of rain and melted snow. The year totals 38 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Tuolumne itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Groveland 2, CA (8 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.