Twain Harte, CA climate
Twain Harte has mild winters and warm summers. A typical July afternoon reaches 88°, a January night drops to 33°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Twain Harte feels like
Winter
Spring
Summer
Fall
Twain Harte 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 | 52° | 33° | 7.9" | 0 | 10 | 0 | 38° – 48° |
| February | 54° | 33° | 7.1" | 0 | 10 | 0 | 38° – 50° |
| March | 58° | 35° | 6.9" | 0 | 10 | 0 | 38° – 53° |
| April | 62° | 38° | 3.6" | 0 | 6 | 0 | 44° – 55° |
| May | 71° | 44° | 2.1" | 0 | 4 | 0 | 49° – 65° |
| June | 81° | 50° | 0.6" | 0 | 1 | 0 | 60° – 71° |
| July | 88° | 57° | 0.1" | 0 | 0 | 0 | 69° – 77° |
| August | 88° | 56° | 0.0" | 0 | 1 | 0 | 69° – 76° |
| September | 83° | 53° | 0.3" | 0 | 1 | 0 | 63° – 72° |
| October | 72° | 45° | 2.3" | 0 | 4 | 0 | 55° – 66° |
| November | 59° | 37° | 4.3" | 0 | 7 | 0 | 39° – 54° |
| December | 51° | 32° | 7.3" | 0 | 10 | 0 | 37° – 47° |
| Year | 68° | 43° | 42.6" | 0.0" | 64 | 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 Twain Harte
Twain Harte gets 43 inches of rain and melted snow a year. January is the wettest month and August the driest. Rain or snow falls on about 64 days a year.
About 213 frost-free days a year
In half of years the last 32° night comes by April 9 and the first one by November 9. That leaves about 213 frost-free days for gardens, longer than 79% of U.S. towns.
Heating and cooling a home in Twain Harte
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Twain Harte, 79% of that work is heating and 21% 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.
Twain Harte and its neighbors
Twain Harte borders 2 towns with climate data. January nights across them vary by 0.5°. Mono Vista has both the coldest January nights (33°) and the hottest July afternoons (90°). Twain Harte’s January low is 33° and its July high 88°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Twain Harte 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 Harte averaged 0.9° warmer than the 1900s. The biggest change is in January (+2.0°). The shift is smaller than in 78% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Twain Harte’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 49° to 65°. August is the most reliable, staying within 8°.
Common questions about Twain Harte’s climate
What is the coldest month in Twain Harte?
December, with a typical high of 51° and a low of 32°.
What is the hottest month in Twain Harte?
August, with a typical high of 88° and a low of 56°. About 75 days a year reach 90°.
How much snow does Twain Harte get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Twain Harte?
In half of years the first 32° night comes by November 9, and the last spring frost by April 9.
What is the rainiest month in Twain Harte?
January, with 7.9 inches of rain and melted snow. The year totals 43 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Twain Harte itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Sonora, CA (10 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.