Oakley’s winters are milder and less snowy than most of the U.S.
A typical July afternoon reaches 91°, a January night drops to 40°, and snow is almost unheard of.
A year in Oakley at a glance
Each month’s typical high and low, and what it brings.
What stands out about Oakley’s climate
Compared with towns across the U.S., with Oakley’s place in California beside it.
What a year in Oakley feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
A freeze most winters
Frost and day counts come from NOAA’s station at Antioch Pumping Plt #3, CA, 4 miles from the town’s center, at about the same height.
The 2023 USDA map puts Oakley’s center in zone 9b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 27°. 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 14 inches of rain a year
January is the wettest month and July the driest. Rain falls on about 50 days a year. Snow is rare: about 0.0" in a normal year at Antioch Pumping Plt #3, CA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Oakley
62% of the work is heating. Months averaging under 55° run from December through February.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Antioch Pumping Plt #3, CA.
Living with Oakley’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 9b. Frost comes about 8 winters in 10, so tender plants can often stay out through winter.
Months with highs of 62–84° and lows of 40° or more: February, March, April, May, October and November. 29 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Oakley from natural hazards, river flooding is the largest share (57%); heat waves, cold waves, winter storms and ice storms together are 4%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Oakley and its neighbors
Every town next door is within a degree of Oakley in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Oakley’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 |
|---|---|---|---|---|
| Oakley, CA | 40° | 91° | 14" | 0.0" |
| Sierra Vista, AZ | 32° | 91° | 14" | 0.4" |
| Ashland, OR | 31° | 91° | 19" | 0.5" |
| Alpine, TX | 30° | 90° | 15" | 2.2" |
| 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 Oakley averaged 1.5° warmer than the 1900s. The biggest change is in January (+2.2°).
A bigger shift than in 58% 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 Oakley compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Oakley’s place among California’s.
Oakley weather by month
Highs, lows and precipitation from NOAA’s grid at Oakley’s center; snow, wet days and snow on the ground from Antioch Pumping Plt #3, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 57° | 40° | 2.9" | 0.0" | 11 | 0 | 44° – 54° |
| February | 62° | 43° | 2.6" | 0.0" | 9 | 0 | 48° – 57° |
| March | 67° | 45° | 2.0" | 0.0" | 8 | 0 | 50° – 63° |
| April | 72° | 48° | 1.0" | 0.0" | 4 | 0 | 55° – 65° |
| May | 79° | 53° | 0.5" | 0.0" | 3 | 0 | 58° – 74° |
| June | 86° | 57° | 0.1" | 0.0" | 1 | 0 | 67° – 75° |
| July | 91° | 59° | 0.0" | 0.0" | 0 | 0 | 71° – 79° |
| August | 90° | 59° | 0.0" | 0.0" | 0 | 0 | 71° – 79° |
| September | 87° | 57° | 0.1" | 0.0" | 0 | 0 | 68° – 76° |
| October | 78° | 52° | 0.7" | 0.0" | 1 | 0 | 62° – 72° |
| November | 66° | 45° | 1.5" | 0.0" | 5 | 0 | 49° – 60° |
| December | 57° | 39° | 2.6" | 0.0" | 9 | 0 | 45° – 52° |
| Year | 74° | 50° | 14.0" | 0.0" | 50 | 0 |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 58° to 74°. December is the most reliable, staying within 7°.
Where Oakley’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 Oakley’s center.
- Snow: Antioch Pumping Plt #3, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Antioch Pumping Plt #3, CA, 4 miles from the town’s center, 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 Oakley’s climate
What is the weather like in Oakley?
A typical July afternoon reaches 91°, a January night drops to 40°, and snow is almost unheard of. Milder January nights than 88% of U.S. towns; hotter July afternoons than 81% of U.S. towns.
How cold does it get in Oakley in winter?
December nights average 39°. About 7 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 45°.
How much snow does Oakley get?
About 0.0 inches in a normal winter at Antioch Pumping Plt #3, CA, so most winters see none.
How hot does it get in Oakley?
July, with a typical high of 91° and a low of 59°. About 64 days a year reach 90° and 10 reach 100° (Antioch Pumping Plt #3, CA).
When is the first and last frost in Oakley?
There is no reliable frost date: a 32° night comes in about 81% of winters at Antioch Pumping Plt #3, CA, so most years bring a freeze but some pass without one.
What growing zone is Oakley in?
Zone 9b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 27°.
What is the best time of year to visit Oakley?
By one simple rule (highs of 62–84° and lows of 40° or more), February, March, April, May, October and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Oakley getting warmer?
Yes: 1991–2020 averaged 1.5° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 58% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Oakley.
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.