Porterville, CA climate
Porterville has mild winters and hot summers, with very little rain. A typical July afternoon reaches 98°, a January night drops to 39°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Porterville feels like
Winter
Spring
Summer
Fall
Porterville 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 | 58° | 39° | 2.0" | 0.2" | 9 | 0 | 43° – 52° |
| February | 64° | 42° | 1.7" | 0 | 8 | 0 | 48° – 59° |
| March | 70° | 45° | 1.8" | 0 | 7 | 0 | 51° – 64° |
| April | 76° | 48° | 1.0" | 0 | 4 | 0 | 58° – 66° |
| May | 84° | 55° | 0.5" | 0 | 3 | 0 | 62° – 76° |
| June | 92° | 61° | 0.1" | 0 | 1 | 0 | 72° – 80° |
| July | 98° | 67° | 0.0" | 0 | 0 | 0 | 79° – 86° |
| August | 97° | 65° | 0.0" | 0 | 0 | 0 | 78° – 84° |
| September | 92° | 61° | 0.1" | 0 | 1 | 0 | 72° – 80° |
| October | 81° | 52° | 0.5" | 0 | 2 | 0 | 63° – 71° |
| November | 67° | 43° | 0.9" | 0 | 4 | 0 | 49° – 60° |
| December | 58° | 38° | 1.7" | 0 | 7 | 0 | 45° – 52° |
| Year | 78° | 51° | 10.4" | 0.2" | 45 | 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 Porterville
Porterville gets 10 inches of rain and melted snow a year. January is the wettest month and July the driest. Rain or snow falls on about 45 days a year.
About 330 frost-free days a year
In half of years the last 32° night comes by January 20 and the first one by December 13. That leaves about 330 frost-free days for gardens, longer than 96% of U.S. towns.
Heating and cooling a home in Porterville
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Porterville, 47% of that work is heating and 53% 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 Porterville 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 Porterville averaged 2.1° warmer than the 1900s. The biggest change is in March (+2.8°). The shift is larger than in 95% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Porterville’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 62° to 76°. August is the most reliable, staying within 7°.
Common questions about Porterville’s climate
What is the coldest month in Porterville?
December, with a typical high of 58° and a low of 38°.
What is the hottest month in Porterville?
July, with a typical high of 98° and a low of 67°. About 122 days a year reach 90°.
How much snow does Porterville get?
Almost none. A normal year brings 0.2 inches.
When is the first frost in Porterville?
In half of years the first 32° night comes by December 13, and the last spring frost by January 20.
What is the rainiest month in Porterville?
January, with 2.0 inches of rain and melted snow. The year totals 10 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Porterville itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Lindsay, CA (10 mi, snow) and Porterville, 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.