Shasta Lake, CA climate
Shasta Lake has mild winters and hot summers. A typical July afternoon reaches 98°, a January night drops to 38°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Shasta Lake feels like
Winter
Spring
Summer
Fall
Shasta 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 | 55° | 38° | 7.5" | 0.1" | 10 | 0 | 42° – 53° |
| February | 59° | 40° | 7.9" | 0.5" | 9 | 0 | 44° – 56° |
| March | 64° | 42° | 7.5" | 0 | 8 | 0 | 45° – 60° |
| April | 70° | 46° | 3.1" | 0 | 6 | 0 | 52° – 63° |
| May | 80° | 53° | 1.9" | 0 | 4 | 0 | 56° – 74° |
| June | 89° | 60° | 1.1" | 0 | 2 | 0 | 68° – 82° |
| July | 98° | 65° | 0.1" | 0 | 0 | 0 | 77° – 85° |
| August | 96° | 63° | 0.1" | 0 | 0 | 0 | 76° – 85° |
| September | 91° | 58° | 0.4" | 0 | 1 | 0 | 71° – 79° |
| October | 78° | 51° | 2.2" | 0 | 3 | 0 | 59° – 70° |
| November | 62° | 43° | 4.5" | 0 | 7 | 0 | 45° – 58° |
| December | 54° | 37° | 8.2" | 0.1" | 10 | 0 | 41° – 49° |
| Year | 75° | 50° | 44.4" | 0.7" | 59 | 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 Shasta Lake
Shasta Lake gets 44 inches of rain and melted snow a year. December is the wettest month and July the driest. Rain or snow falls on about 59 days a year.
A year-round growing season
Heating and cooling a home in Shasta Lake
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Shasta Lake, 55% of that work is heating and 45% 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.
Shasta Lake and its neighbors
Shasta Lake borders 1 town with climate data. January nights across them vary by 0.9°. Redding has both the coldest January nights (39°) and the hottest July afternoons (99°). Shasta Lake’s January low is 38° and its July high 98°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Shasta 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 Shasta Lake averaged 1.2° warmer than the 1900s. The biggest change is in September (+2.2°). The shift is larger than in 52% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Shasta 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 56° to 74°. December is the most reliable, staying within 7°.
Common questions about Shasta Lake’s climate
What is the coldest month in Shasta Lake?
December, with a typical high of 54° and a low of 37°.
What is the hottest month in Shasta Lake?
July, with a typical high of 98° and a low of 65°. About 90 days a year reach 90°.
How much snow does Shasta Lake get?
Almost none. A normal year brings 0.7 inches.
When is the first frost in Shasta Lake?
Frost is uncommon. Only 87% of years see a night at 32° or below.
What is the rainiest month in Shasta Lake?
December, with 8.2 inches of rain and melted snow. The year totals 44 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Shasta Lake itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Redding Cdf, CA (12 mi, snow) and Shasta Dam, CA (3 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.