Atascadero, CA climate
Atascadero has mild winters and warm summers, with very little rain. A typical July afternoon reaches 86°, a January night drops to 38°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Atascadero feels like
Winter
Spring
Summer
Fall
Atascadero 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 | 62° | 38° | 4.6" | 0 | 9 | 0 | 46° – 55° |
| February | 63° | 39° | 4.2" | 0 | 10 | 0 | 47° – 56° |
| March | 66° | 41° | 3.5" | 0 | 9 | 0 | 47° – 59° |
| April | 71° | 43° | 1.1" | 0 | 5 | 0 | 52° – 61° |
| May | 76° | 46° | 0.4" | 0 | 2 | 0 | 57° – 67° |
| June | 82° | 50° | 0.0" | 0 | 1 | 0 | 61° – 70° |
| July | 86° | 54° | 0.0" | 0 | 0 | 0 | 67° – 74° |
| August | 87° | 54° | 0.0" | 0 | 0 | 0 | 67° – 74° |
| September | 85° | 51° | 0.1" | 0 | 1 | 0 | 64° – 72° |
| October | 79° | 47° | 0.8" | 0 | 3 | 0 | 59° – 68° |
| November | 69° | 41° | 1.6" | 0 | 5 | 0 | 48° – 59° |
| December | 62° | 37° | 3.4" | 0 | 8 | 0 | 46° – 54° |
| Year | 74° | 45° | 19.9" | 0.0" | 52 | 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 Atascadero
Atascadero gets 20 inches of rain and melted snow a year. January is the wettest month and July the driest. Rain or snow falls on about 52 days a year.
About 238 frost-free days a year
In half of years the last 32° night comes by March 15 and the first one by November 10. That leaves about 238 frost-free days for gardens, longer than 88% of U.S. towns.
Heating and cooling a home in Atascadero
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Atascadero, 77% of that work is heating and 23% 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.
How Atascadero 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 Atascadero averaged 1.8° warmer than the 1900s. The biggest change is in January (+2.6°). The shift is larger than in 85% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Atascadero’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. March swings the most: between 1991 and 2020 its average temperature ranged from 47° to 59°. August is the most reliable, staying within 7°.
Common questions about Atascadero’s climate
What is the coldest month in Atascadero?
December, with a typical high of 62° and a low of 37°.
What is the hottest month in Atascadero?
August, with a typical high of 87° and a low of 54°. About 80 days a year reach 90°.
How much snow does Atascadero get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Atascadero?
In half of years the first 32° night comes by November 10, and the last spring frost by March 15.
What is the rainiest month in Atascadero?
January, with 4.6 inches of rain and melted snow. The year totals 20 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Atascadero itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Santa Margarita Boost, CA (8 mi, snow) and Paso Robles, CA (10 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.