Oroville, California climate: Normal weather by month, frost dates and records
Oroville's normal year runs from 40°F January nights to 96°F July afternoons, with 25.7 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 17.3°C, January lows of 4°C, July highs of 35°C, 652 mm of precipitation a year.
- NOAA stationOroville Municipal Airport
- Station IDUSW00093210
- Location39.49°N 121.62°W
- Elevation190 ft (58 m)
- Population19,712
On October 23, the normal high in Oroville is 76°F and the normal low 50°F, and the chance of measurable rain or snow is 18%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Oroville.
- Jan 55° 40°
- Feb 61° 42°
- Mar 66° 45°
- Apr 72° 49°
- May 81° 55°
- Jun 90° 61°
- Jul 96° 65°
- Aug 94° 64°
- Sep 89° 59°
- Oct 78° 52°
- Nov 64° 44°
- Dec 55° 40°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Oroville each month?
July is the warmest month, with normal highs of 96°F; January the coldest, with normal lows of 40°F. The most precipitation falls in January (5.20 in), the least in July (0.04 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 55°F | 40°F | 47.4°F | 5.20 | 12 | <1 | 4 | 9 h 40 min |
| February | 61°F | 42°F | 51.5°F | 4.79 | 10 | <1 | 2 | 10 h 40 min |
| March | 66°F | 45°F | 55.6°F | 3.33 | 10 | <1 | <1 | 11 h 50 min |
| April | 72°F | 49°F | 60.4°F | 1.80 | 7 | 1 | <1 | 13 h 10 min |
| May | 81°F | 55°F | 68.0°F | 1.05 | 5 | 6 | <1 | 14 h 20 min |
| June | 90°F | 61°F | 75.4°F | 0.32 | 2 | 17 | <1 | 15 h |
| July | 96°F | 65°F | 80.5°F | 0.04 | <1 | 27 | <1 | 14 h 40 min |
| August | 94°F | 64°F | 78.8°F | 0.04 | 1 | 25 | <1 | 13 h 50 min |
| September | 89°F | 59°F | 74.0°F | 0.16 | 1 | 15 | <1 | 12 h 30 min |
| October | 78°F | 52°F | 65.1°F | 1.44 | 4 | 2 | <1 | 11 h 10 min |
| November | 64°F | 44°F | 53.9°F | 2.87 | 10 | <1 | 1 | 10 h |
| December | 55°F | 40°F | 47.4°F | 4.63 | 12 | <1 | 4 | 9 h 20 min |
| Year (annual) | 75°F | 51°F | 63.2°F | 25.67 | 73 | 93 | 11 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 13°C | 4°C | 8.6°C | 132 mm |
| February | 16°C | 6°C | 10.8°C | 122 mm |
| March | 19°C | 7°C | 13.1°C | 85 mm |
| April | 22°C | 9°C | 15.8°C | 46 mm |
| May | 27°C | 13°C | 20.0°C | 27 mm |
| June | 32°C | 16°C | 24.1°C | 8 mm |
| July | 35°C | 18°C | 26.9°C | 1 mm |
| August | 35°C | 18°C | 26.0°C | 1 mm |
| September | 31°C | 15°C | 23.3°C | 4 mm |
| October | 26°C | 11°C | 18.4°C | 37 mm |
| November | 18°C | 7°C | 12.2°C | 73 mm |
| December | 13°C | 4°C | 8.6°C | 118 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00093210; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Oroville?
Normal highs sit between 65°F and 85°F in March, April, May and October. Of those, October has the fewest days with rain (4).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00093210.
When is the last frost in Oroville?
In Oroville, the last spring frost (32°F) comes after January 29 in half of years and after February 28 in one year in ten; the first autumn frost comes before December 7 in half of years and before November 20 in one year in ten. A night at 32°F or colder comes at all in 95% of years here (NOAA).
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- January 291 year in 10 after February 28; 9 in 10 after December 28
- First autumn frost, half of years before
- December 71 year in 10 before November 20; 9 in 10 before January 6
NOAA puts the median frost-free season at 317 days, and the season without a hard freeze (28°F) at 360 days.
A hard freeze (28°F) comes after January 9 in half of springs and before December 27 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Oroville in zone 9b in ZIP code 95968, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Oroville's NOAA station is in zone 9b: the coldest night of a typical year reaches 28°F (19 complete years).
Frost dates for every NOAA station in California · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00093210; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Oroville?
In a normal year in Oroville, 93 days a year reach 90°F (19 of them 100°F or more), 11 nights fall to 32°F or colder and 73 days bring measurable precipitation.
- Days at 90°F or more
- 93a normal year
- Days at 100°F or more
- 19a normal year
- Nights at 32°F or colder
- 11a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 73a normal year
The highest temperature in this station's record (since 1998) is 114°F, on July 6, 2024; the lowest is 22°F, on January 13, 2013.
The wettest calendar year on that record is 2010, with 31.79 in.
Source: NOAA NCEI 1991-2020 annual normals, station USW00093210; records: ACIS (NOAA Regional Climate Centers), station USW00093210. Records use complete months only; a month missing more than three days is left out.
How sunny is Oroville?
Over a year 87% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Oroville, 5.1 kWh per square metre a day. July is the sunniest month (98%) and December the cloudiest (69%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 70% | 2.1 |
| February | 74% | 3.1 |
| March | 76% | 4.3 |
| April | 81% | 5.9 |
| May | 88% | 7.3 |
| June | 94% | 8.3 |
| July | 98% | 8.3 |
| August | 97% | 7.4 |
| September | 95% | 5.9 |
| October | 89% | 4.1 |
| November | 78% | 2.6 |
| December | 69% | 1.9 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Oroville need?
A normal year in Oroville brings 2,394 heating degree days, 55% fewer than the median U.S. place (5,373), and 1,747 cooling degree days, 93% more than the median (908). Four months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 5,120 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 544 | 0 |
| February | 379 | 0 |
| March | 293 | 2 |
| April | 166 | 28 |
| May | 47 | 140 |
| June | 6 | 318 |
| July | 0 | 480 |
| August | 0 | 428 |
| September | 5 | 275 |
| October | 74 | 75 |
| November | 334 | 1 |
| December | 546 | 0 |
| Year (annual) | 2,394 | 1,747 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00093210. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Oroville been warmer than normal lately?
2025 averaged 63.9°F, 0.6°F above the 1991-2020 normal of 63.2°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 65.2°F | +2.0°F | – |
| 2022 | 65.2°F | +2.0°F | 13.49 |
| 2023 | 63.8°F | +0.6°F | 24.83 |
| 2024 | 65.9°F | +2.7°F | 30.86 |
| 2025 | 63.9°F | +0.6°F | 22.39 |
Source: observed years: ACIS, station USW00093210. A year counts only with all twelve months complete.
How does Oroville's climate compare?
Oroville is warmer than 154 of the other 218 places with their own NOAA record in California, and wetter than 159. Across the 7,247 U.S. stations with normals, its annual mean of 63.2°F is warmer than 83%.
In the Köppen classification computed from these normals, Oroville is Csa: temperate, dry-summer, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Oroville share this climate record?
9 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Oroville East, CA7,369 people · 7 mi E
- Gridley, CA7,355 people · 10 mi SW
- Thermalito, CA6,645 people · 2 mi NE
- Palermo, CA5,440 people · 7 mi SE
- Kelly Ridge, CA3,010 people · 9 mi E
- South Oroville, CA2,811 people · 4 mi E
- Biggs, CA1,941 people · 8 mi SW
- Honcut, CA343 people · 12 mi S
- Richvale, CA298 people · 7 mi W
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Oroville's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Oroville. This page uses Oroville Municipal Airport; the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Oroville station USC00046521 | 4 mi NE | 171 ft | 63.5°F | 40°F | 97°F | 30.6 | – | January 30 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Oroville's climate
What is the coldest month in Oroville?
January, with a normal high of 55°F and a normal low of 40°F. The warmest is July (96°F by day, 65°F at night).
What is the rainiest month in Oroville?
January, with 5.20 in of precipitation in a normal year; the driest is July with 0.04 in.
What plant hardiness zone is Oroville in?
The USDA's 2023 map puts Oroville in zone 9b in ZIP code 95968, the nearest ZIP area. By the same method at Oroville's NOAA station, the coldest night of a typical year reaches 28°F (19 years, 1991-2020): zone 9b.
How late can frost come in Oroville?
In half of years the last 32°F night comes after January 29; in one year in ten it comes after February 28. Waiting until February 28 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oroville in OctoberThis month day by day, its records and recent years
- California climateThe statewide normals and every place in the state
- Chico, CA17 miles from this station, 61.6°F a year
- Paradise, CA18 miles from this station, 61.5°F a year
- Dobbins, CA24 miles from this station, 58.7°F a year
- De Sabla, CA26 miles from this station, 57.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made