Potrero, CA climate
Potrero has mild winters and hot summers, with very little rain. A typical July afternoon reaches 92°, a January night drops to 39°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Potrero feels like
Winter
Spring
Summer
Fall
Potrero 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 | 64° | 39° | 3.4" | 0.1" | 7 | 0 | 47° – 58° |
| February | 64° | 39° | 3.9" | 0 | 8 | 0 | 46° – 58° |
| March | 67° | 40° | 2.7" | 0 | 7 | 0 | 48° – 60° |
| April | 72° | 42° | 1.3" | 0.1" | 5 | 0 | 52° – 61° |
| May | 77° | 48° | 0.8" | 0 | 2 | 0 | 57° – 69° |
| June | 86° | 52° | 0.1" | 0 | 0 | 0 | 64° – 74° |
| July | 92° | 58° | 0.1" | 0 | 2 | 0 | 70° – 80° |
| August | 94° | 59° | 0.2" | 0 | 2 | 0 | 73° – 80° |
| September | 89° | 56° | 0.3" | 0 | 2 | 0 | 70° – 77° |
| October | 80° | 49° | 0.6" | 0 | 3 | 0 | 60° – 70° |
| November | 71° | 43° | 1.4" | 0 | 5 | 0 | 50° – 62° |
| December | 64° | 38° | 2.6" | 0.1" | 7 | 0 | 47° – 56° |
| Year | 77° | 47° | 17.4" | 0.3" | 48 | 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 Potrero
Potrero gets 17 inches of rain and melted snow a year. February is the wettest month and June the driest. Rain or snow falls on about 48 days a year.
About 174 frost-free days a year
In half of years the last 32° night comes by April 30 and the first one by October 26. That leaves about 174 frost-free days for gardens, shorter than 56% of U.S. towns.
Heating and cooling a home in Potrero
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Potrero, 76% of that work is heating and 24% 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 Potrero 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 Potrero averaged 2.1° warmer than the 1900s. The biggest change is in January (+3.6°). The shift is larger than in 95% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Potrero’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 48° to 60°. August is the most reliable, staying within 7°.
Common questions about Potrero’s climate
What is the coldest month in Potrero?
December, with a typical high of 64° and a low of 38°.
What is the hottest month in Potrero?
August, with a typical high of 94° and a low of 59°. About 97 days a year reach 90°.
How much snow does Potrero get?
Almost none. A normal year brings 0.3 inches.
When is the first frost in Potrero?
In half of years the first 32° night comes by October 26, and the last spring frost by April 30.
What is the rainiest month in Potrero?
February, with 3.9 inches of rain and melted snow. The year totals 17 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Potrero itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Campo, CA (8 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.