Granite Hills, CA climate
Granite Hills has warm winters and warm summers, with very little rain. A typical July afternoon reaches 88°, a January night drops to 42°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Granite Hills feels like
Winter
Spring
Summer
Fall
Granite Hills 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 | 69° | 42° | 2.7" | 0 | 7 | 0 | 51° – 60° |
| February | 69° | 43° | 3.2" | 0 | 8 | 0 | 52° – 62° |
| March | 71° | 46° | 2.2" | 0 | 7 | 0 | 53° – 65° |
| April | 74° | 48° | 1.0" | 0 | 4 | 0 | 57° – 65° |
| May | 77° | 53° | 0.4" | 0 | 3 | 0 | 61° – 70° |
| June | 83° | 57° | 0.1" | 0 | 1 | 0 | 65° – 74° |
| July | 88° | 61° | 0.1" | 0 | 1 | 0 | 71° – 80° |
| August | 90° | 62° | 0.1" | 0 | 0 | 0 | 73° – 79° |
| September | 88° | 59° | 0.2" | 0 | 1 | 0 | 70° – 78° |
| October | 82° | 53° | 0.5" | 0 | 3 | 0 | 63° – 72° |
| November | 75° | 45° | 1.1" | 0 | 4 | 0 | 53° – 64° |
| December | 68° | 41° | 2.1" | 0 | 7 | 0 | 51° – 58° |
| Year | 78° | 51° | 13.6" | 0.0" | 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 Granite Hills
Granite Hills gets 14 inches of rain and melted snow a year. February is the wettest month and July the driest. Rain or snow falls on about 45 days a year.
A year-round growing season
Heating and cooling a home in Granite Hills
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Granite Hills, 49% of that work is heating and 51% 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.
Granite Hills and its neighbors
Granite Hills borders 3 towns with climate data. January nights across them vary by 1.2°. Crest has both the coldest January nights (42°) and the hottest July afternoons (89°). Granite Hills’s January low is 42° and its July high 88°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Granite Hills 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 Granite Hills averaged 2.1° warmer than the 1900s. The biggest change is in January (+3.2°). The shift is larger than in 97% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Granite Hills’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 53° to 65°. August is the most reliable, staying within 6°.
Common questions about Granite Hills’s climate
What is the coldest month in Granite Hills?
December, with a typical high of 68° and a low of 41°.
What is the hottest month in Granite Hills?
August, with a typical high of 90° and a low of 62°. About 57 days a year reach 90°.
How much snow does Granite Hills get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Granite Hills?
Frost is uncommon. Only 73% of years see a night at 32° or below.
What is the rainiest month in Granite Hills?
February, with 3.2 inches of rain and melted snow. The year totals 14 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Granite Hills itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Lakeside 2 E, CA (4 mi, snow) and El Cajon, 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.