Julian, CA climate
Julian has mild winters and warm summers, with very little rain. A typical July afternoon reaches 88°, a January night drops to 35°, and about 6 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Julian feels like
Winter
Spring
Summer
Fall
Julian 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° | 4.1" | 1.1" | 6 | 1 | 41° – 52° |
| February | 56° | 35° | 4.9" | 1.9" | 8 | 1 | 39° – 53° |
| March | 60° | 37° | 3.6" | 3.0" | 6 | 0 | 42° – 56° |
| April | 65° | 39° | 1.8" | 0.2" | 4 | 0 | 46° – 56° |
| May | 72° | 44° | 0.7" | 0 | 3 | 0 | 51° – 66° |
| June | 81° | 51° | 0.1" | 0 | 1 | 0 | 59° – 71° |
| July | 88° | 58° | 0.3" | 0 | 1 | 0 | 67° – 77° |
| August | 89° | 58° | 0.4" | 0 | 1 | 0 | 70° – 77° |
| September | 83° | 53° | 0.4" | 0 | 1 | 0 | 65° – 73° |
| October | 73° | 46° | 0.9" | 0 | 3 | 0 | 54° – 65° |
| November | 63° | 39° | 2.0" | 0 | 4 | 0 | 43° – 57° |
| December | 55° | 35° | 3.4" | 0.2" | 6 | 0 | 42° – 52° |
| Year | 70° | 44° | 22.5" | 6.4" | 45 | 1 |
“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 Julian
Julian gets 22 inches of rain and melted snow a year. February is the wettest month and June the driest. Rain or snow falls on about 45 days a year.
About 248 frost-free days a year
In half of years the last 32° night comes by March 27 and the first one by December 1. That leaves about 248 frost-free days for gardens, longer than 90% of U.S. towns.
Heating and cooling a home in Julian
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Julian, 79% of that work is heating and 21% 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 Julian 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 Julian averaged 2.0° warmer than the 1900s. The biggest change is in January (+3.1°). The shift is larger than in 93% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Julian’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 66°. August is the most reliable, staying within 7°.
Common questions about Julian’s climate
What is the coldest month in Julian?
February, with a typical high of 56° and a low of 35°.
What is the hottest month in Julian?
August, with a typical high of 89° and a low of 58°. About 25 days a year reach 90°.
How much snow does Julian get?
About 6 inches in a normal winter, most of it in March.
When is the first frost in Julian?
In half of years the first 32° night comes by December 1, and the last spring frost by March 27.
What is the rainiest month in Julian?
February, with 4.9 inches of rain and melted snow. The year totals 22 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Julian itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Julian Cdf, CA (1 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.