North San Juan, CA climate
North San Juan has mild winters and warm summers, with plenty of rain. A typical July afternoon reaches 91°, a January night drops to 35°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in North San Juan feels like
Winter
Spring
Summer
Fall
North San Juan 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 | 54° | 35° | 9.9" | 0 | 12 | 0 | 40° – 52° |
| February | 57° | 37° | 9.3" | 0 | 11 | 0 | 39° – 54° |
| March | 60° | 39° | 8.3" | 0 | 11 | 0 | 42° – 57° |
| April | 66° | 42° | 4.6" | 0 | 8 | 0 | 47° – 58° |
| May | 74° | 49° | 2.5" | 0 | 5 | 0 | 51° – 70° |
| June | 83° | 55° | 0.8" | 0 | 2 | 0 | 64° – 75° |
| July | 91° | 60° | 0.0" | 0 | 0 | 0 | 72° – 80° |
| August | 90° | 59° | 0.1" | 0 | 1 | 0 | 71° – 78° |
| September | 85° | 54° | 0.4" | 0 | 2 | 0 | 65° – 74° |
| October | 74° | 46° | 2.9" | 0 | 4 | 0 | 56° – 67° |
| November | 61° | 39° | 5.6" | 0 | 8 | 0 | 42° – 56° |
| December | 53° | 35° | 10.4" | 0 | 12 | 0 | 40° – 49° |
| Year | 71° | 46° | 54.7" | 0.0" | 75 | 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 North San Juan
North San Juan gets 55 inches of rain and melted snow a year. December is the wettest month and July the driest. Rain or snow falls on about 75 days a year.
About 229 frost-free days a year
In half of years the last 32° night comes by April 1 and the first one by November 17. That leaves about 229 frost-free days for gardens, longer than 86% of U.S. towns.
Heating and cooling a home in North San Juan
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In North San Juan, 76% of that work is heating and 24% 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 North San Juan 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 North San Juan averaged 0.8° warmer than the 1900s. The biggest change is in September (+2.0°). The shift is smaller than in 82% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at North San Juan’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 70°. August is the most reliable, staying within 7°.
Common questions about North San Juan’s climate
What is the coldest month in North San Juan?
December, with a typical high of 53° and a low of 35°.
What is the hottest month in North San Juan?
July, with a typical high of 91° and a low of 60°. About 79 days a year reach 90°.
How much snow does North San Juan get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in North San Juan?
In half of years the first 32° night comes by November 17, and the last spring frost by April 1.
What is the rainiest month in North San Juan?
December, with 10.4 inches of rain and melted snow. The year totals 55 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for North San Juan itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Colgate Powerhouse, CA (5 mi, snow) and Dobbins 1 S, CA (5 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.