Twain, CA climate
Twain has chilly winters and warm summers. A typical July afternoon reaches 89°, a January night drops to 27°, and about 28 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Twain feels like
Winter
Spring
Summer
Fall
Twain 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 | 46° | 27° | 6.4" | 5.8" | 12 | 3 | 30° – 41° |
| February | 49° | 28° | 6.5" | 7.6" | 11 | 2 | 32° – 45° |
| March | 55° | 31° | 5.7" | 5.4" | 13 | 1 | 36° – 49° |
| April | 61° | 34° | 3.0" | 1.6" | 9 | 0 | 41° – 51° |
| May | 70° | 40° | 1.9" | 0 | 7 | 0 | 47° – 63° |
| June | 80° | 46° | 0.8" | 0 | 3 | 0 | 58° – 69° |
| July | 89° | 51° | 0.1" | 0 | 1 | 0 | 66° – 74° |
| August | 88° | 49° | 0.2" | 0 | 1 | 0 | 65° – 73° |
| September | 82° | 44° | 0.4" | 0 | 2 | 0 | 59° – 66° |
| October | 69° | 36° | 2.0" | 0.1" | 5 | 0 | 48° – 57° |
| November | 53° | 30° | 3.9" | 1.7" | 8 | 0 | 34° – 47° |
| December | 44° | 26° | 7.2" | 6.2" | 12 | 1 | 32° – 39° |
| Year | 65° | 37° | 38.0" | 28.4" | 84 | 7 |
“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 Twain
Twain gets 38 inches of rain and melted snow a year. December is the wettest month and July the driest. Rain or snow falls on about 84 days a year. Snow covers the ground about 7 days of the year.
About 122 frost-free days a year
In half of years the last 32° night comes by May 22 and the first one by September 25. That leaves about 122 frost-free days for gardens, shorter than 97% of U.S. towns.
Heating and cooling a home in Twain
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Twain, 95% of that work is heating and 5% 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 Twain 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 Twain averaged 1.0° warmer than the 1900s. The biggest change is in January (+2.1°). The shift is smaller than in 67% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Twain’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 47° to 63°. December is the most reliable, staying within 7°.
Common questions about Twain’s climate
What is the coldest month in Twain?
December, with a typical high of 44° and a low of 26°.
What is the hottest month in Twain?
July, with a typical high of 89° and a low of 51°. About 56 days a year reach 90°.
How much snow does Twain get?
About 28 inches in a normal winter, most of it in February.
When is the first frost in Twain?
In half of years the first 32° night comes by September 25, and the last spring frost by May 22.
What is the rainiest month in Twain?
December, with 7.2 inches of rain and melted snow. The year totals 38 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Twain itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Quincy, CA (8 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.