Photo: ASDFGH · CC BY-SA 4.0Nights stay kind in West Covina each January, milder than in 94% of U.S. towns
In July the day’s top temperature is typically 89°. By precipitation alone, it ranks drier than 92% of U.S. towns. Since 1901–2000, the year has warmed by 2.7°, most of all in January. Long walks are most pleasant from October to June, when afternoons reach 68–83°.
A year in West Covina at a glance
Each month’s typical high and low, and what it brings.
What stands out about West Covina’s climate
Compared with towns across the U.S., with West Covina’s place in California beside it.
What a year in West Covina 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 San Gabriel Fire Dept, CA, 11 miles from the city’s center point, 110 ft lower.
The 2023 USDA map puts West Covina’s center in zone 10a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 34°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 16 inches of rain a year
February is the wettest month and August the driest. Rain falls on about 33 days a year. Snow is rare: about 0.0" in a normal year at Covina City Yard Fc387b, CA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in West Covina
43% 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 San Gabriel Fire Dept, CA.
Living with West Covina’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 10a. Frost comes about 1 winter in 7, 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. 10 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in West Covina from natural hazards, earthquakes are the largest share (56%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →West Covina and its neighbors
Covina has the coldest January nights next door (44°, 1° colder). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like West Covina’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 |
|---|---|---|---|---|
| West Covina, CA | 45° | 89° | 16" | 0.0" |
| Sierra Vista Southeast, AZ | 32° | 91° | 15" | 0.7" |
| Port Isabel, TX | 52° | 92° | 26" | 0.2" |
| Ashland, OR | 31° | 91° | 19" | 0.5" |
| Finley, WA | 29° | 91° | 9" | 2.0" |
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 West Covina averaged 2.7° warmer than the 1900s. The biggest change is in January (+3.6°).
A bigger shift than in all but 18 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. In a city of 105,000 people, part of the change is the city itself: pavement and buildings hold heat (the urban heat island).
How West Covina compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with West Covina’s place among California’s.
West Covina weather by month
Highs, lows and precipitation from NOAA’s grid at West Covina’s center; snow, wet days and snow on the ground from Covina City Yard Fc387b, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 69° | 45° | 3.7" | 0.0" | 6 | 0 | 53° – 62° |
| February | 69° | 46° | 4.2" | 0.0" | 6 | 0 | 51° – 67° |
| March | 72° | 48° | 2.4" | 0.0" | 5 | 0 | 54° – 67° |
| April | 75° | 50° | 0.9" | 0.0" | 3 | 0 | 58° – 67° |
| May | 78° | 55° | 0.4" | 0.0" | 2 | 0 | 62° – 72° |
| June | 83° | 59° | 0.1" | 0.0" | 1 | 0 | 67° – 76° |
| July | 89° | 63° | 0.0" | 0.0" | 0 | 0 | 73° – 81° |
| August | 91° | 63° | 0.0" | 0.0" | 0 | 0 | 74° – 81° |
| September | 88° | 61° | 0.1" | 0.0" | 0 | 0 | 71° – 79° |
| October | 82° | 56° | 0.6" | 0.0" | 2 | 0 | 64° – 74° |
| November | 74° | 49° | 0.9" | 0.0" | 3 | 0 | 55° – 65° |
| December | 68° | 44° | 2.5" | 0.0" | 5 | 0 | 52° – 61° |
| Year | 78° | 53° | 15.7" | 0.0" | 33 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 51° to 67°. August is the most reliable, staying within 7°.
Where West Covina’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 West Covina’s center.
- Snow: Covina City Yard Fc387b, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: San Gabriel Fire Dept, CA, 11 miles from the city’s center point, 110 ft lower; 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 West Covina’s climate
What is the weather like in West Covina?
A typical July afternoon reaches 89°, a January night drops to 45°, and snow is almost unheard of. Milder January nights than 94% of U.S. towns; hotter July afternoons than 72% of U.S. towns.
How cold does it get in West Covina in winter?
December nights average 44°. About 1 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 52°.
How much snow does West Covina get?
About 0.0 inches in a normal winter at Covina City Yard Fc387b, CA, so most winters see none.
How hot does it get in West Covina?
July, with a typical high of 89° and a low of 63°. About 65 days a year reach 90° and 7 reach 100° (San Gabriel Fire Dept, CA).
When is the first and last frost in West Covina?
Most years have no frost at all: a 32° night comes in about 15% of winters at San Gabriel Fire Dept, CA, usually in December or January.
What growing zone is West Covina in?
Zone 10a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 34°.
What is the best time of year to visit West Covina?
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 West Covina getting warmer?
Yes: 1991–2020 averaged 2.7° warmer than 1901–2000 on NOAA’s grid. A bigger shift than all but 18 U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in West Covina.
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.