Hornbrook, CA climate
Hornbrook has mild winters and hot summers, with very little rain. A typical July afternoon reaches 93°, a January night drops to 30°, and about 12 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Hornbrook feels like
Winter
Spring
Summer
Fall
Hornbrook 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 | 49° | 30° | 3.3" | 4.3" | 13 | 2 | 34° – 44° |
| February | 53° | 31° | 2.3" | 2.6" | 10 | 1 | 36° – 48° |
| March | 59° | 33° | 2.0" | 0.4" | 11 | 0 | 40° – 52° |
| April | 65° | 36° | 1.2" | 0.2" | 9 | 0 | 46° – 56° |
| May | 74° | 43° | 1.2" | 0 | 8 | 0 | 51° – 66° |
| June | 83° | 48° | 0.6" | 0 | 4 | 0 | 61° – 73° |
| July | 93° | 54° | 0.4" | 0 | 3 | 0 | 65° – 78° |
| August | 92° | 53° | 0.3" | 0 | 2 | 0 | 68° – 77° |
| September | 85° | 46° | 0.3" | 0 | 2 | 0 | 62° – 70° |
| October | 71° | 39° | 1.1" | 0 | 5 | 0 | 51° – 60° |
| November | 55° | 33° | 2.4" | 1.5" | 11 | 1 | 36° – 50° |
| December | 47° | 29° | 3.6" | 2.6" | 13 | 1 | 34° – 42° |
| Year | 69° | 39° | 18.8" | 11.6" | 91 | 5 |
“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 Hornbrook
Hornbrook gets 19 inches of rain and melted snow a year. December is the wettest month and August the driest. Rain or snow falls on about 91 days a year. Snow covers the ground about 5 days of the year.
About 169 frost-free days a year
In half of years the last 32° night comes by April 30 and the first one by October 18. That leaves about 169 frost-free days for gardens, shorter than 62% of U.S. towns.
Heating and cooling a home in Hornbrook
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Hornbrook, 86% of that work is heating and 14% 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 Hornbrook 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 Hornbrook averaged 1.7° warmer than the 1900s. The biggest change is in January (+3.1°). The shift is larger than in 81% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Hornbrook’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 51° to 66°. September is the most reliable, staying within 8°.
Common questions about Hornbrook’s climate
What is the coldest month in Hornbrook?
December, with a typical high of 47° and a low of 29°.
What is the hottest month in Hornbrook?
July, with a typical high of 93° and a low of 54°. About 67 days a year reach 90°.
How much snow does Hornbrook get?
About 12 inches in a normal winter, most of it in January.
When is the first frost in Hornbrook?
In half of years the first 32° night comes by October 18, and the last spring frost by April 30.
What is the rainiest month in Hornbrook?
December, with 3.6 inches of rain and melted snow. The year totals 19 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Hornbrook itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Yreka, CA (15 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.