Grayson, CA climate
Grayson has mild winters and hot summers, with very little rain. A typical July afternoon reaches 94°, a January night drops to 39°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Grayson feels like
Winter
Spring
Summer
Fall
Grayson 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 | 57° | 39° | 2.3" | 0 | 10 | 0 | 44° – 53° |
| February | 63° | 42° | 2.0" | 0 | 10 | 0 | 49° – 56° |
| March | 68° | 45° | 1.5" | 0 | 9 | 0 | 51° – 62° |
| April | 74° | 48° | 0.7" | 0 | 5 | 0 | 56° – 64° |
| May | 81° | 53° | 0.5" | 0 | 3 | 0 | 60° – 74° |
| June | 89° | 58° | 0.1" | 0 | 1 | 0 | 69° – 76° |
| July | 94° | 61° | 0.0" | 0 | 0 | 0 | 73° – 81° |
| August | 93° | 60° | 0.0" | 0 | 0 | 0 | 73° – 80° |
| September | 89° | 57° | 0.1" | 0 | 1 | 0 | 70° – 76° |
| October | 80° | 51° | 0.5" | 0 | 3 | 0 | 62° – 70° |
| November | 66° | 43° | 1.0" | 0 | 6 | 0 | 49° – 60° |
| December | 57° | 39° | 2.0" | 0 | 10 | 0 | 45° – 53° |
| Year | 76° | 49° | 10.7" | 0.0" | 57 | 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 Grayson
Grayson gets 11 inches of rain and melted snow a year. January is the wettest month and July the driest. Rain or snow falls on about 57 days a year.
About 312 frost-free days a year
In half of years the last 32° night comes by January 31 and the first one by December 5. That leaves about 312 frost-free days for gardens, longer than 95% of U.S. towns.
Heating and cooling a home in Grayson
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Grayson, 59% of that work is heating and 41% 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 Grayson 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 Grayson averaged 1.5° warmer than the 1900s. The biggest change is in January (+2.3°). The shift is larger than in 69% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Grayson’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 60° to 74°. September is the most reliable, staying within 6°.
Common questions about Grayson’s climate
What is the coldest month in Grayson?
December, with a typical high of 57° and a low of 39°.
What is the hottest month in Grayson?
July, with a typical high of 94° and a low of 61°. About 90 days a year reach 90°.
How much snow does Grayson get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Grayson?
In half of years the first 32° night comes by December 5, and the last spring frost by January 31.
What is the rainiest month in Grayson?
January, with 2.3 inches of rain and melted snow. The year totals 11 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Grayson itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Turlock #2, CA (19 mi, snow) and Modesto City Co Airport, CA (13 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.