San Ysidro, NM climate
San Ysidro has chilly winters and hot summers, with very little rain. A typical July afternoon reaches 92°, a January night drops to 19°, and about 6 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in San Ysidro feels like
Winter
Spring
Summer
Fall
San Ysidro 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 | 48° | 19° | 0.4" | 0.8" | 4 | 0 | 28° – 39° |
| February | 54° | 24° | 0.3" | 0.7" | 3 | 0 | 33° – 44° |
| March | 63° | 30° | 0.5" | 0.9" | 3 | 0 | 43° – 51° |
| April | 70° | 35° | 0.5" | 0 | 3 | 0 | 49° – 57° |
| May | 80° | 44° | 0.6" | 0 | 3 | 0 | 58° – 67° |
| June | 91° | 53° | 0.5" | 0 | 3 | 0 | 67° – 76° |
| July | 92° | 59° | 1.7" | 0 | 8 | 0 | 73° – 80° |
| August | 90° | 58° | 1.7" | 0 | 7 | 0 | 71° – 78° |
| September | 83° | 50° | 1.3" | 0 | 6 | 0 | 61° – 70° |
| October | 72° | 38° | 1.1" | 0 | 4 | 0 | 52° – 59° |
| November | 58° | 27° | 0.6" | 0.3" | 2 | 0 | 35° – 49° |
| December | 47° | 19° | 0.5" | 3.0" | 4 | 1 | 29° – 39° |
| Year | 71° | 38° | 9.6" | 5.7" | 50 | 2 |
“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 San Ysidro
San Ysidro gets 10 inches of rain and melted snow a year. August is the wettest month and February the driest. Rain or snow falls on about 50 days a year.
About 188 frost-free days a year
In half of years the last 32° night comes by April 17 and the first one by October 24. That leaves about 188 frost-free days for gardens, longer than 62% of U.S. towns.
Heating and cooling a home in San Ysidro
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In San Ysidro, 78% of that work is heating and 22% 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 San Ysidro 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 San Ysidro averaged 1.3° warmer than the 1900s. The biggest change is in March (+2.5°). The shift is larger than in 60% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at San Ysidro’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. November swings the most: between 1991 and 2020 its average temperature ranged from 35° to 49°. August is the most reliable, staying within 7°.
Common questions about San Ysidro’s climate
What is the coldest month in San Ysidro?
January, with a typical high of 48° and a low of 19°.
What is the hottest month in San Ysidro?
July, with a typical high of 92° and a low of 59°. About 71 days a year reach 90°.
How much snow does San Ysidro get?
About 6 inches in a normal winter, most of it in December.
When is the first frost in San Ysidro?
In half of years the first 32° night comes by October 24, and the last spring frost by April 17.
What is the rainiest month in San Ysidro?
August, with 1.7 inches of rain and melted snow. The year totals 10 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for San Ysidro itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Jemez Dam, NM (18 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.