California Polytechnic State University, CA climate
California Polytechnic State University has warm winters and pleasant summers, with very little rain. A typical July afternoon reaches 78°, a January night drops to 42°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in California Polytechnic State University feels like
Winter
Spring
Summer
Fall
California Polytechnic State University 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° | 42° | 4.7" | 0 | 9 | 0 | 49° – 57° |
| February | 64° | 42° | 4.5" | 0 | 10 | 0 | 49° – 59° |
| March | 66° | 44° | 3.7" | 0 | 9 | 0 | 48° – 61° |
| April | 69° | 45° | 1.2" | 0 | 5 | 0 | 52° – 61° |
| May | 72° | 48° | 0.5" | 0 | 2 | 0 | 55° – 65° |
| June | 76° | 51° | 0.1" | 0 | 1 | 0 | 58° – 67° |
| July | 78° | 54° | 0.0" | 0 | 0 | 0 | 63° – 70° |
| August | 79° | 54° | 0.0" | 0 | 0 | 0 | 64° – 70° |
| September | 80° | 52° | 0.1" | 0 | 1 | 0 | 62° – 71° |
| October | 77° | 49° | 0.8" | 0 | 3 | 0 | 58° – 69° |
| November | 70° | 44° | 1.7" | 0 | 5 | 0 | 50° – 61° |
| December | 63° | 41° | 3.6" | 0 | 8 | 0 | 49° – 57° |
| Year | 71° | 47° | 20.8" | 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 California Polytechnic State University
California Polytechnic State University gets 21 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.
A year-round growing season
Heating and cooling a home in California Polytechnic State University
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In California Polytechnic State University, 83% of that work is heating and 17% 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 California Polytechnic State University 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 California Polytechnic State University averaged 2.0° warmer than the 1900s. The biggest change is in January (+2.8°). The shift is larger than in 95% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at California Polytechnic State University’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 61°. August is the most reliable, staying within 6°.
Common questions about California Polytechnic State University’s climate
What is the coldest month in California Polytechnic State University?
December, with a typical high of 63° and a low of 41°.
What is the hottest month in California Polytechnic State University?
September, with a typical high of 80° and a low of 52°. About 19 days a year reach 90°.
How much snow does California Polytechnic State University get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in California Polytechnic State University?
Frost is uncommon. Only 68% of years see a night at 32° or below.
What is the rainiest month in California Polytechnic State University?
January, with 4.7 inches of rain and melted snow. The year totals 21 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for California Polytechnic State University itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Santa Margarita Boost, CA (5 mi, snow) and San Luis Obispo Poly, 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.