Angwin, CA climate
Angwin has mild winters and warm summers. A typical July afternoon reaches 87°, a January night drops to 39°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Angwin feels like
Winter
Spring
Summer
Fall
Angwin 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 | 55° | 39° | 7.8" | 0 | 13 | 0 | 43° – 54° |
| February | 57° | 39° | 7.3" | 0 | 11 | 0 | 43° – 54° |
| March | 61° | 41° | 5.6" | 0 | 10 | 0 | 44° – 58° |
| April | 66° | 42° | 2.5" | 0 | 6 | 0 | 48° – 59° |
| May | 73° | 48° | 1.6" | 0 | 3 | 0 | 53° – 68° |
| June | 81° | 53° | 0.3" | 0 | 1 | 0 | 63° – 70° |
| July | 87° | 56° | 0.0" | 0 | 0 | 0 | 69° – 76° |
| August | 87° | 56° | 0.0" | 0 | 0 | 0 | 68° – 76° |
| September | 84° | 55° | 0.1" | 0 | 1 | 0 | 66° – 73° |
| October | 75° | 51° | 1.9" | 0 | 3 | 0 | 59° – 69° |
| November | 62° | 43° | 4.0" | 0 | 8 | 0 | 45° – 56° |
| December | 54° | 39° | 8.4" | 0 | 13 | 0 | 42° – 50° |
| Year | 70° | 47° | 39.6" | 0.0" | 69 | 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 Angwin
Angwin gets 40 inches of rain and melted snow a year. December is the wettest month and July the driest. Rain or snow falls on about 69 days a year.
About 245 frost-free days a year
In half of years the last 32° night comes by April 7 and the first one by December 5. That leaves about 245 frost-free days for gardens, longer than 89% of U.S. towns.
Heating and cooling a home in Angwin
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Angwin, 85% of that work is heating and 15% 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 Angwin 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 Angwin averaged 1.5° warmer than the 1900s. The biggest change is in January (+2.4°). The shift is larger than in 72% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Angwin’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 53° to 68°. September is the most reliable, staying within 7°.
Common questions about Angwin’s climate
What is the coldest month in Angwin?
December, with a typical high of 54° and a low of 39°.
What is the hottest month in Angwin?
July, with a typical high of 87° and a low of 56°. About 27 days a year reach 90°.
How much snow does Angwin get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Angwin?
In half of years the first 32° night comes by December 5, and the last spring frost by April 7.
What is the rainiest month in Angwin?
December, with 8.4 inches of rain and melted snow. The year totals 40 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Angwin itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Saint Helena, CA (5 mi, snow) and Angwin Pacific Union College, CA (1 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.