Casa de Oro-Mount Helix, CA climate
Casa de Oro-Mount Helix has warm winters and warm summers, with very little rain. A typical July afternoon reaches 85°, a January night drops to 44°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Casa de Oro-Mount Helix feels like
Winter
Spring
Summer
Fall
Casa de Oro-Mount Helix 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 | 69° | 44° | 2.5" | 0 | 7 | 0 | 53° – 61° |
| February | 68° | 45° | 2.8" | 0 | 8 | 0 | 53° – 62° |
| March | 70° | 47° | 2.0" | 0 | 7 | 0 | 54° – 65° |
| April | 73° | 50° | 1.0" | 0 | 4 | 0 | 57° – 66° |
| May | 75° | 55° | 0.4" | 0 | 3 | 0 | 61° – 70° |
| June | 80° | 58° | 0.1" | 0 | 1 | 0 | 65° – 73° |
| July | 85° | 62° | 0.0" | 0 | 1 | 0 | 70° – 79° |
| August | 87° | 63° | 0.0" | 0 | 0 | 0 | 72° – 78° |
| September | 86° | 61° | 0.1" | 0 | 1 | 0 | 70° – 77° |
| October | 80° | 55° | 0.5" | 0 | 3 | 0 | 64° – 73° |
| November | 74° | 48° | 1.1" | 0 | 4 | 0 | 55° – 65° |
| December | 68° | 43° | 2.0" | 0 | 7 | 0 | 52° – 59° |
| Year | 76° | 52° | 12.6" | 0.0" | 45 | 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 Casa de Oro-Mount Helix
Casa de Oro-Mount Helix gets 13 inches of rain and melted snow a year. February is the wettest month and July the driest. Rain or snow falls on about 45 days a year.
A year-round growing season
Heating and cooling a home in Casa de Oro-Mount Helix
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Casa de Oro-Mount Helix, 49% of that work is heating and 51% 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.
Casa de Oro-Mount Helix and its neighbors
Casa de Oro-Mount Helix borders 4 towns with climate data. January nights across them vary by 1.5°. El Cajon has the coldest January nights (43°) and Rancho San Diego the hottest July afternoons (86°). Casa de Oro-Mount Helix’s January low is 44° and its July high 85°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Casa de Oro-Mount Helix 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 Casa de Oro-Mount Helix averaged 2.2° warmer than the 1900s. The biggest change is in January (+3.2°). The shift is larger than in 97% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Casa de Oro-Mount Helix’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. March swings the most: between 1991 and 2020 its average temperature ranged from 54° to 65°. August is the most reliable, staying within 7°.
Common questions about Casa de Oro-Mount Helix’s climate
What is the coldest month in Casa de Oro-Mount Helix?
December, with a typical high of 68° and a low of 43°.
What is the hottest month in Casa de Oro-Mount Helix?
August, with a typical high of 87° and a low of 63°. About 57 days a year reach 90°.
How much snow does Casa de Oro-Mount Helix get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Casa de Oro-Mount Helix?
Frost is uncommon. Only 73% of years see a night at 32° or below.
What is the rainiest month in Casa de Oro-Mount Helix?
February, with 2.8 inches of rain and melted snow. The year totals 13 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Casa de Oro-Mount Helix itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Lakeside 2 E, CA (8 mi, snow) and El Cajon, CA (3 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.