Signal Hill, CA climate
Signal Hill has warm winters and pleasant summers, with very little rain. A typical July afternoon reaches 78°, a January night drops to 48°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Signal Hill feels like
Winter
Spring
Summer
Fall
Signal Hill 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 | 68° | 48° | 3.0" | 0 | 6 | 0 | 54° – 63° |
| February | 67° | 49° | 3.3" | 0 | 6 | 0 | 54° – 64° |
| March | 68° | 51° | 1.8" | 0 | 5 | 0 | 54° – 66° |
| April | 70° | 53° | 0.6" | 0 | 2 | 0 | 57° – 66° |
| May | 72° | 57° | 0.2" | 0 | 1 | 0 | 60° – 69° |
| June | 74° | 60° | 0.1" | 0 | 1 | 0 | 64° – 71° |
| July | 78° | 63° | 0.0" | 0 | 1 | 0 | 67° – 75° |
| August | 80° | 64° | 0.0" | 0 | 0 | 0 | 69° – 75° |
| September | 80° | 62° | 0.1" | 0 | 0 | 0 | 67° – 76° |
| October | 76° | 59° | 0.4" | 0 | 2 | 0 | 63° – 74° |
| November | 72° | 52° | 0.8" | 0 | 3 | 0 | 56° – 65° |
| December | 67° | 48° | 2.0" | 0 | 6 | 0 | 54° – 61° |
| Year | 73° | 55° | 12.2" | 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 Signal Hill
Signal Hill gets 12 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 Signal Hill
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Signal Hill, 50% of that work is heating and 50% 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 Signal Hill 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 Signal Hill averaged 2.3° warmer than the 1900s. The biggest change is in January (+3.2°). The shift is larger than in 99% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Signal Hill’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 66°. August is the most reliable, staying within 6°.
Common questions about Signal Hill’s climate
What is the coldest month in Signal Hill?
December, with a typical high of 67° and a low of 48°.
What is the hottest month in Signal Hill?
August, with a typical high of 80° and a low of 64°. About 23 days a year reach 90°.
How much snow does Signal Hill get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Signal Hill?
Frost is uncommon. Only 1% of years see a night at 32° or below.
What is the rainiest month in Signal Hill?
February, with 3.3 inches of rain and melted snow. The year totals 12 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Signal Hill itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Torrance Airport, CA (10 mi, snow) and Long Beach Daugherty Fld, CA (1 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.