Upper Lake, CA climate
Upper Lake has mild winters and hot summers. A typical July afternoon reaches 93°, a January night drops to 34°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Upper Lake feels like
Winter
Spring
Summer
Fall
Upper Lake 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° | 34° | 7.6" | 0 | 16 | 0 | 41° – 53° |
| February | 59° | 36° | 6.7" | 0 | 14 | 0 | 40° – 54° |
| March | 63° | 38° | 5.3" | 0 | 13 | 0 | 42° – 58° |
| April | 68° | 40° | 2.5" | 0 | 9 | 0 | 48° – 59° |
| May | 76° | 45° | 1.6" | 0 | 6 | 0 | 52° – 69° |
| June | 85° | 51° | 0.4" | 0 | 2 | 0 | 63° – 75° |
| July | 93° | 55° | 0.0" | 0 | 0 | 0 | 70° – 78° |
| August | 92° | 54° | 0.1" | 0 | 1 | 0 | 70° – 78° |
| September | 87° | 49° | 0.2" | 0 | 1 | 0 | 65° – 73° |
| October | 77° | 44° | 1.7" | 0 | 5 | 0 | 55° – 68° |
| November | 63° | 38° | 4.1" | 0 | 12 | 0 | 42° – 55° |
| December | 55° | 34° | 7.4" | 0 | 16 | 0 | 40° – 48° |
| Year | 73° | 43° | 37.5" | 0.0" | 96 | 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 Upper Lake
Upper Lake gets 38 inches of rain and melted snow a year. January is the wettest month and July the driest. Rain or snow falls on about 96 days a year.
About 211 frost-free days a year
In half of years the last 32° night comes by April 8 and the first one by November 6. That leaves about 211 frost-free days for gardens, longer than 79% of U.S. towns.
Heating and cooling a home in Upper Lake
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Upper Lake, 77% of that work is heating and 23% 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 Upper Lake 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 Upper Lake averaged 1.0° warmer than the 1900s. The biggest change is in January (+1.8°). The shift is smaller than in 71% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Upper Lake’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 69°. July is the most reliable, staying within 8°.
Common questions about Upper Lake’s climate
What is the coldest month in Upper Lake?
December, with a typical high of 55° and a low of 34°.
What is the hottest month in Upper Lake?
July, with a typical high of 93° and a low of 55°. About 82 days a year reach 90°.
How much snow does Upper Lake get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Upper Lake?
In half of years the first 32° night comes by November 6, and the last spring frost by April 8.
What is the rainiest month in Upper Lake?
January, with 7.6 inches of rain and melted snow. The year totals 38 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Upper Lake itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Potter Valley Powerhouse, CA (18 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.