Midwinter lows in South Whittier stay above those of 95% of U.S. towns
The warmest part of a July day comes in at 86° on average. It is a dry place: less rain and snow fall here than on 94% of U.S. towns. Warming shows here too: 2.4° more than in 1901–2000, led by January. For walks and days out, the stretch from October to June brings highs of 69–81°.
A year in South Whittier at a glance
Each month’s typical high and low, and what it brings.
What stands out about South Whittier’s climate
Compared with towns across the U.S., with South Whittier’s place in California beside it.
What a year in South Whittier feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Frost is rare
Frost and day counts come from NOAA’s station at Fullerton Muni Airport, 5 miles from the city’s center point, at about the same height.
The 2023 USDA map puts South Whittier’s center in zone 10b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 35°. Plant labels use the zone; frost dates tell you when to plant.
90° days by month
Average days at 90° or more
About 14 inches of rain a year
February is the wettest month and August the driest. Rain falls on about 32 days a year. Snow is rare: about 0.0" in a normal year at Whittier City Yard Fc106c, CA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in South Whittier
41% of the work is heating, so air conditioning is the bigger bill. No month averages under 55°.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Fullerton Muni Airport.
Living with South Whittier’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 10b. Frost comes about 1 winter in 14, so tender plants can often stay out through winter.
Months with highs of 62–84° and lows of 40° or more: January, February, March, April, May, June, October, November and December. 1.7 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in South Whittier from natural hazards, earthquakes are the largest share (51%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →South Whittier and its neighbors
Every town next door is within a degree of South Whittier in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like South Whittier’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| South Whittier, CA | 47° | 86° | 14" | 0.0" |
| Ewa Beach, HI | 62° | 87° | 17" | 0.0" |
| Port Isabel, TX | 52° | 92° | 26" | 0.2" |
| Sierra Vista Southeast, AZ | 32° | 91° | 15" | 0.7" |
| The Dalles, OR | 31° | 88° | 15" | 5.5" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in South Whittier averaged 2.4° warmer than the 1900s. The biggest change is in January (+3.3°).
A bigger shift than in all but 122 U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How South Whittier compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with South Whittier’s place among California’s.
South Whittier weather by month
Highs, lows and precipitation from NOAA’s grid at South Whittier’s center; snow, wet days and snow on the ground from Whittier City Yard Fc106c, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 69° | 47° | 3.2" | 0.0" | 6 | 0 | 54° – 64° |
| February | 69° | 48° | 3.5" | 0.0" | 7 | 0 | 53° – 66° |
| March | 72° | 50° | 2.1" | 0.0" | 4 | 0 | 54° – 68° |
| April | 75° | 52° | 0.7" | 0.0" | 3 | 0 | 59° – 67° |
| May | 76° | 57° | 0.3" | 0.0" | 1 | 0 | 62° – 72° |
| June | 80° | 60° | 0.1" | 0.0" | 0 | 0 | 66° – 74° |
| July | 86° | 63° | 0.0" | 0.0" | 0 | 0 | 71° – 79° |
| August | 87° | 64° | 0.0" | 0.0" | 0 | 0 | 72° – 79° |
| September | 86° | 62° | 0.1" | 0.0" | 0 | 0 | 70° – 79° |
| October | 81° | 57° | 0.5" | 0.0" | 2 | 0 | 65° – 75° |
| November | 75° | 51° | 0.9" | 0.0" | 3 | 0 | 57° – 66° |
| December | 69° | 46° | 2.3" | 0.0" | 6 | 0 | 54° – 62° |
| Year | 77° | 55° | 13.5" | 0.0" | 32 | 0 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 54° to 68°. August is the most reliable, staying within 6°.
Where South Whittier’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at South Whittier’s center.
- Snow: Whittier City Yard Fc106c, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Fullerton Muni Airport, 5 miles from the city’s center point, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about South Whittier’s climate
What is the weather like in South Whittier?
A typical July afternoon reaches 86°, a January night drops to 47°, and snow is almost unheard of. Milder January nights than 95% of U.S. towns; hotter July afternoons than 52% of U.S. towns.
How cold does it get in South Whittier in winter?
December nights average 46°. A night at 32° or below comes in only some winters (0.3 a year on average). In the coldest December of the last 30 years the month averaged 54°.
How much snow does South Whittier get?
About 0.0 inches in a normal winter at Whittier City Yard Fc106c, CA, so most winters see none.
How hot does it get in South Whittier?
July, with a typical high of 86° and a low of 63°. About 39 days a year reach 90° and 4 reach 100° (Fullerton Muni Airport).
When is the first and last frost in South Whittier?
Most years have no frost at all: a 32° night comes in about 7% of winters at Fullerton Muni Airport, usually in December or January.
What growing zone is South Whittier in?
Zone 10b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 35°.
What is the best time of year to visit South Whittier?
By one simple rule (highs of 62–84° and lows of 40° or more), January, February, March, April, May, June, October, November and December. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is South Whittier getting warmer?
Yes: 1991–2020 averaged 2.4° warmer than 1901–2000 on NOAA’s grid. A bigger shift than all but 122 U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in South Whittier.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.