Photo: Columbia · Public domainOak Glen is drier than 86% of U.S. towns: 28 inches of precipitation a year
Deep winter brings January lows near 36°. Winters are mild: January nights here are milder than in 82% of U.S. towns. The latest 30-year average runs 1.8° warmer than 1901–2000’s, with January up the most. Warm coats and heating bills mark the months from December to March, when means dip under 50°.
A year in Oak Glen at a glance
Each month’s typical high and low, and what it brings.
What stands out about Oak Glen’s climate
Compared with towns across the U.S., with Oak Glen’s place in California beside it.
What a year in Oak Glen feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 176 frost-free days a year
In half of years the last 32° night comes by May 5 and the first by November 2. Frost and day counts come from Lake Arrowhead, CA, 19 miles away.
The 2023 USDA map puts Oak Glen’s center in zone 8b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 18°. 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 31 inches of snow a winter
Snow, measured at Idyllwild Fire Dept, CA, falls mostly in February. Precipitation (rain plus melted snow) adds up to 28 inches a year; February is the wettest month and June the driest. Rain or snow falls on about 47 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Oak Glen
93% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from November through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Lake Arrowhead, CA.
Living with Oak Glen’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
176 frost-free days in zone 8b. The last frost comes by May 5 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 2.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October. 24 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Oak Glen from natural hazards, wildfire is the largest share (59%). Normals are averages; the hazards page covers the extremes.
Natural hazards →Oak Glen and its neighbors
Yucaipa the hottest July afternoons (96°, 8° warmer). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Oak Glen’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 |
|---|---|---|---|---|
| Oak Glen, CA | 36° | 87° | 28" | 31" |
| Hood River, OR | 32° | 85° | 23" | 17" |
| Coeur d'Alene, ID | 26° | 83° | 26" | 27" |
| Pullman, WA | 27° | 84° | 20" | 33" |
| Payson, AZ | 30° | 92° | 20" | 19" |
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 Oak Glen averaged 1.8° warmer than the 1900s. The biggest change is in January (+2.9°).
A bigger shift than in 82% of 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 Oak Glen compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Oak Glen’s place among California’s.
Oak Glen weather by month
Highs, lows and precipitation from NOAA’s grid at Oak Glen’s center; snow, wet days and snow on the ground from Idyllwild Fire Dept, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 55° | 36° | 5.6" | 6.3" | 7 | 40° – 52° |
| February | 55° | 36° | 6.1" | 9.8" | 8 | 37° – 53° |
| March | 60° | 38° | 4.9" | 4.1" | 6 | 41° – 56° |
| April | 65° | 41° | 2.1" | 3.5" | 4 | 47° – 57° |
| May | 72° | 46° | 0.9" | 0.5" | 2 | 52° – 65° |
| June | 82° | 54° | 0.2" | 0.0" | 0 | 62° – 72° |
| July | 87° | 61° | 0.3" | 0.0" | 2 | 69° – 78° |
| August | 88° | 61° | 0.2" | 0.0" | 2 | 72° – 77° |
| September | 82° | 57° | 0.5" | 0.0" | 2 | 66° – 73° |
| October | 72° | 48° | 1.0" | 0.0" | 3 | 56° – 66° |
| November | 62° | 40° | 1.9" | 2.3" | 4 | 43° – 56° |
| December | 54° | 35° | 4.5" | 4.2" | 6 | 40° – 51° |
| Year | 69° | 46° | 28.1" | 30.7" | 47 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 37° to 53°. August is the most reliable, staying within 5°.
Where Oak Glen’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 Oak Glen’s center.
- Snow: Idyllwild Fire Dept, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Lake Arrowhead, CA, 19 miles from the town’s center, 400 ft higher; no station nearby passes every check; this is the nearest one in the same valley, flagged above.
- 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 Oak Glen’s climate
What is the weather like in Oak Glen?
A typical July afternoon reaches 87°, a January night drops to 36°, and about 31 inches of snow falls in a normal winter. Milder January nights than 82% of U.S. towns; hotter July afternoons than 63% of U.S. towns.
How cold does it get in Oak Glen in winter?
December nights average 35°. About 105 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 40°.
How much snow does Oak Glen get?
About 31 inches in a normal winter at Idyllwild Fire Dept, CA, most of it in February.
How hot does it get in Oak Glen?
July, with a typical high of 87° and a low of 61°. About 11 days a year reach 90° (Lake Arrowhead, CA).
When is the first and last frost in Oak Glen?
In half of years the last spring frost (32°) comes by May 5 and the first fall frost by November 2, about 176 frost-free days, at Lake Arrowhead, CA.
What growing zone is Oak Glen in?
Zone 8b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 18°.
What is the best time of year to visit Oak Glen?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Oak Glen getting warmer?
Yes: 1991–2020 averaged 1.8° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 82% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Oak Glen.
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.