Clearlake, CA climate
Clearlake has mild winters and hot summers. A typical July afternoon reaches 93°, a January night drops to 35°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Clearlake feels like
Winter
Spring
Summer
Fall
Clearlake 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 | 56° | 35° | 8.3" | 0.2" | 14 | 0 | 40° – 55° |
| February | 58° | 36° | 7.7" | 0.1" | 13 | 0 | 40° – 55° |
| March | 63° | 38° | 5.4" | 0.1" | 10 | 0 | 42° – 58° |
| April | 68° | 41° | 2.7" | 0 | 8 | 0 | 48° – 60° |
| May | 77° | 47° | 1.5" | 0 | 5 | 0 | 52° – 70° |
| June | 86° | 53° | 0.3" | 0 | 2 | 0 | 63° – 75° |
| July | 93° | 57° | 0.0" | 0 | 0 | 0 | 71° – 79° |
| August | 92° | 55° | 0.0" | 0 | 0 | 0 | 70° – 78° |
| September | 87° | 51° | 0.1" | 0 | 1 | 0 | 64° – 73° |
| October | 77° | 45° | 1.7" | 0 | 4 | 0 | 56° – 69° |
| November | 63° | 38° | 3.9" | 0 | 9 | 0 | 43° – 56° |
| December | 55° | 34° | 8.1" | 0 | 13 | 0 | 41° – 50° |
| Year | 73° | 44° | 39.7" | 0.4" | 79 | 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 Clearlake
Clearlake gets 40 inches of rain and melted snow a year. January is the wettest month and July the driest. Rain or snow falls on about 79 days a year.
About 209 frost-free days a year
In half of years the last 32° night comes by April 10 and the first one by November 6. That leaves about 209 frost-free days for gardens, longer than 78% of U.S. towns.
Heating and cooling a home in Clearlake
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Clearlake, 82% of that work is heating and 18% 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 Clearlake 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 Clearlake averaged 1.2° warmer than the 1900s. The biggest change is in January (+2.0°). The shift is smaller than in 56% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Clearlake’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 52° to 70°. August is the most reliable, staying within 8°.
Common questions about Clearlake’s climate
What is the coldest month in Clearlake?
December, with a typical high of 55° and a low of 34°.
What is the hottest month in Clearlake?
July, with a typical high of 93° and a low of 57°. About 66 days a year reach 90°.
How much snow does Clearlake get?
Almost none. A normal year brings 0.4 inches.
When is the first frost in Clearlake?
In half of years the first 32° night comes by November 6, and the last spring frost by April 10.
What is the rainiest month in Clearlake?
January, with 8.3 inches of rain and melted snow. The year totals 40 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Clearlake itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Clearlake 4 Se, CA (4 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.