Oroville, CA Climate: Temperature & Rain by Month
Temperature and precipitation from NOAA NCEI 1991–2020 normals →, plus PlainClimate's derived comfort score
30-year climate normals (1991-2020) from Oroville's primary NOAA station, OROVILLE.
The climate verdict for Oroville
Oroville, California has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 64°F. It scores 100/100 for climate comfort (excellent), putting it in the top third of station-mapped location scores and exceeding 99% of them.
- 64°F
- average temperature, NOAA 1991-2020 normal
- 100/100
- comfort score, above 99% of station-mapped location scores
- 30.6"
- yearly precipitation total
- 317 days
- frost-free days per growing season
Oroville: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00046521 · Oroville, CA 64°F mean · 30.6" precip
TEMP-MILD · RANK-UPPER · PHOTO-FINISH · PRCP-MID · SWING-MID · COMF-TOP · LOAD-MIX · STN-1 · BOOK-FULL
- TEMP-MILD 64°F
- RANK-UPPER #5,763
- PHOTO-FINISH ≈ Alvord
- PRCP-MID 30.6"
- SWING-MID 31°F
- COMF-TOP 100/100
- LOAD-MIX H/C balanced
- STN-1 USC00046521
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Alvord, TX (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every CA station list.
- Oroville (this station) 64°F
- Hot Ash Mtn, CA 64°F
- Near Alvord, TX 64°F
- Near Andrews, SC 64°F
- Near Arkansas Post, AR 64°F
Climate Living Index · Oroville
Oroville: 85/100 · grade A
Oroville publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Oroville, not an official NOAA rating. Rankings still use Comfort Score 100/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 317 days/year | 100/100 · A |
| Annual temperature balance | 63.5°F · 4.0° from 67.5°F | 88/100 · A |
| Precipitation balance | 30.6 in · 4.4 from 35 in | 84/100 · B |
| Normal heat + freeze calendar | 95 calendar days | 77/100 · B |
Oroville · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Oroville is a temperate Köppen climate: Csa
Coldest-month mean 48.7°F and warmest-month mean 79.9°F place this station in temperate, dry-summer, hot summer climates (Csa). Class Csa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, dry-summer, hot summer.
- Köppen code
- Csa
- Group
- Temperate
- Warmest month
- 79.9°F
- Coldest month
- 48.7°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · balanced station
Where Oroville sits across the climate record
Three NOAA fields for Oroville's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 16% warmest
- Among 6,861 stations, Oroville sits in the warmer third of annual means.
- Annual precipitation
- 41st percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Narrower than 89%
- Warmest-to-coldest month gap for Oroville is compact versus 6,861 complete station-years.
How Oroville compares across U.S. station-mapped locations
Oroville's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
100 Top 1% score exceeds 99% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). Below this entry.
- 70–80: 650 station-mapped locations (11%). Below this entry.
- 80–90: 921 station-mapped locations (15%). Below this entry.
- 90–100: 564 station-mapped locations (9%). This entry sits in this band.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Oroville's measured station temperature trend
MethodologyAcross 88 complete annual observations from 1886 to 2021, OROVILLE changed little at a fitted rate of 0.01°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Oroville primary station fitted change +0.01 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 58°F (14°C) | 40°F (4°C) | 49°F (9°C) | 5.8" | 5.3 | 0.0 |
| February | 62°F (17°C) | 42°F (6°C) | 52°F (11°C) | 5.6" | 2.2 | 0.0 |
| March | 68°F (20°C) | 46°F (8°C) | 57°F (14°C) | 4.7" | 0.7 | 0.1 |
| April | 74°F (23°C) | 48°F (9°C) | 61°F (16°C) | 2.2" | 0.1 | 0.8 |
| May | 82°F (28°C) | 54°F (12°C) | 68°F (20°C) | 1.4" | 0.1 | 6.6 |
| June | 91°F (33°C) | 59°F (15°C) | 75°F (24°C) | 0.6" | 0.0 | 17.3 |
| July | 97°F (36°C) | 63°F (17°C) | 80°F (27°C) | 0.0" | 0.0 | 27.4 |
| August | 96°F (35°C) | 61°F (16°C) | 78°F (26°C) | 0.1" | 0.0 | 25.4 |
| September | 90°F (32°C) | 57°F (14°C) | 73°F (23°C) | 0.4" | 0.0 | 15.7 |
| October | 79°F (26°C) | 51°F (11°C) | 65°F (18°C) | 1.3" | 0.0 | 3.3 |
| November | 66°F (19°C) | 45°F (7°C) | 55°F (13°C) | 2.9" | 2.1 | 0.0 |
| December | 58°F (14°C) | 40°F (4°C) | 49°F (9°C) | 5.5" | 5.5 | 0.0 |
The year, day by day
The year in Oroville runs from a mild 39°F around January 1 to 97°F at the peak near July 20, and the normal low never reaches freezing on any date in the record.
When the heat sits
Normal highs reach 90°F from June 12 through September 14, covering 95 dates. The broader mild season, normal highs of 70°F or more, runs April 1 to November 5.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
No freezing date
Not one calendar date in the 1991–2020 record carries a normal low at or below 32°F. The coldest normal low of the year is 39°F around January 1.
Where the wet dates fall
The likeliest wet date is February 18, when 36% of years recorded at least a hundredth of an inch. The driest is July 18 at 1%. Summed across the calendar, that is about 66 wet dates a year.
The widest day
August 5 carries the biggest normal gap between afternoon and dawn, 35°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Oroville.
Where Oroville Stands Nationally
Summers here run among the most heat-heavy normals calendars in the country: on about 95 days a year the normal daily high itself reaches 90°F — a count fewer than one station in ten exceeds.
Daily temperature swings run wider than most of the country, peaking near 35°F between the normal high and low.
Oroville earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
11.2 days with precipitation
10.3 days with precipitation
10.0 days with precipitation
6.4 days with precipitation
4.3 days with precipitation
1.8 days with precipitation
0.1 days with precipitation
0.3 days with precipitation
0.9 days with precipitation
3.4 days with precipitation
6.6 days with precipitation
10.2 days with precipitation
Oroville's wet season runs through the cold months
December, January and February carry 55% of the year's precipitation here, while June through August contribute 2%. That is the cool-season-dominant pattern of the West Coast and the higher inland West, where storm tracks swing south in winter and summer turns dry; the thermometer meanwhile shows a 31.2°F seasonal spread.
- Wettest month
- January, 5.8"
- Driest month
- July, 0.0"
- Wettest three months
- January, February, December (55% of the year)
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A cool-season label means the December-February share reaches 35%. Where snow falls, the monthly figures above report liquid-equivalent precipitation, so a wet winter month is not necessarily a rainy one.
When it rains in Oroville, it arrives in quantity
30.6" of precipitation falls across only about 65 wet days here, averaging 0.47 inches each. Fewer days carry more water: the year's total is delivered in comparatively heavy events rather than persistent damp.
- Days with measurable precipitation
- about 65 a year, 18% of all days
- Average depth per wet day
- 0.47 inches
- Most wet days
- January, about 11
- Fewest wet days
- July, about 0
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, and a per-day average is not a forecast of any individual storm.
Frost Dates & Growing Season
First Fall Freeze
December 13
50% probability date
Last Spring Freeze
January 30
50% probability date
Growing Season
317 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
2,215
Higher = more heating needed
Cooling Degree Days
1,700
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside CA closest to Oroville on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (64°F here).
- Alvord, TX 64°F · 0.0°F off
- Andrews, SC 64°F · 0.0°F off
- Bonham, TX 64°F · 0.0°F off
- Hemingway, SC 64°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (30.6" here), excluding temperature-peer places.
- Fredericksburg, TX 30.6" · 0.0" off
- Kerrville, TX 30.6" · 0.0" off
- Okeene, OK 30.6" · 0.0" off
- Worthington, MN 30.5" · 0.0" off
Data-derived climate profile
How Oroville's climate pattern fits together
mixed demand · moderate · mid swing
July and January mark the typical warm and cold ends of the calendar in Oroville's middle-range seasonal profile. The measured spread is 31.2°F. The annual average is 64°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Heating and cooling both register in Oroville's normal, at 2,215 and 1,700 degree days respectively. Neither total exceeds the other by more than two to one, so the record is better read as a mixed-demand calendar than as heating-led or cooling-led.
The frost-free window extends for about 317 days. That is a long calendar measure, but it is not a forecast and does not combine heat, rainfall, soil, or local elevation into a planting recommendation.
Oroville's 30.6 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Snowfall is not added to the interpretation because its annual value is missing. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from Oroville's primary station, where heating and cooling demand are close enough that neither season sets the character on its own. On a balanced station like Oroville, the bands are descriptive ranges rather than an official NOAA classification or a forecast.
Questions about Oroville's climate
How much rain does Oroville get? ▼
How many days above 90°F does Oroville get? ▼
How much energy does heating and cooling require in Oroville? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Oroville's primary station: OROVILLE (USC00046521). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 0654386). Match rule for Oroville: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Oroville comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.