Sierra Madre, CA climate
Sierra Madre has warm winters and warm summers. A typical July afternoon reaches 90°, a January night drops to 43°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Sierra Madre feels like
Winter
Spring
Summer
Fall
Sierra Madre 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 | 62° | 43° | 6.5" | 0 | 6 | 0 | 48° – 60° |
| February | 63° | 43° | 7.0" | 0 | 6 | 0 | 45° – 62° |
| March | 67° | 44° | 4.3" | 0 | 5 | 0 | 48° – 63° |
| April | 70° | 45° | 1.7" | 0 | 3 | 0 | 53° – 63° |
| May | 75° | 51° | 0.8" | 0 | 2 | 0 | 57° – 70° |
| June | 83° | 56° | 0.2" | 0 | 1 | 0 | 65° – 75° |
| July | 90° | 62° | 0.0" | 0 | 0 | 0 | 72° – 81° |
| August | 91° | 63° | 0.0" | 0 | 0 | 0 | 74° – 81° |
| September | 87° | 61° | 0.3" | 0 | 1 | 0 | 70° – 78° |
| October | 78° | 54° | 1.1" | 0 | 2 | 0 | 62° – 71° |
| November | 69° | 47° | 1.7" | 0 | 2 | 0 | 50° – 62° |
| December | 61° | 43° | 4.5" | 0 | 5 | 0 | 47° – 58° |
| Year | 75° | 51° | 28.2" | 0.0" | 34 | 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 Sierra Madre
Sierra Madre gets 28 inches of rain and melted snow a year. February is the wettest month and August the driest. Rain or snow falls on about 34 days a year.
A year-round growing season
Heating and cooling a home in Sierra Madre
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Sierra Madre, 44% of that work is heating and 56% 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.
Sierra Madre and its neighbors
Sierra Madre borders 2 towns with climate data. January nights across them vary by 3.1°. Arcadia has both the coldest January nights (45°) and the hottest July afternoons (89°). Sierra Madre’s January low is 43° and its July high 90°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Sierra Madre 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 Sierra Madre averaged 2.6° warmer than the 1900s. The biggest change is in January (+3.5°). The shift is larger than in 100% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Sierra Madre’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 45° to 62°. August is the most reliable, staying within 6°.
Common questions about Sierra Madre’s climate
What is the coldest month in Sierra Madre?
February, with a typical high of 63° and a low of 43°.
What is the hottest month in Sierra Madre?
August, with a typical high of 91° and a low of 63°. About 74 days a year reach 90°.
How much snow does Sierra Madre get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Sierra Madre?
Frost is uncommon. Only 13% of years see a night at 32° or below.
What is the rainiest month in Sierra Madre?
February, with 7.0 inches of rain and melted snow. The year totals 28 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Sierra Madre itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Altadena, CA (5 mi, snow) and Pasadena, CA (6 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.