Occidental, CA Climate: Temperature & Rain by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from Occidental's primary NOAA station, OCCIDENTAL.
The climate verdict for Occidental
Water is the standout signal in Occidental, California: 53.8 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 58°F. It scores 76/100 for climate comfort (good), putting it in the top third of station-mapped location scores and exceeding 69% of them.
- 58°F
- yearly average temperature, NOAA normal
- 76/100
- comfort score, above 69% of station-mapped location scores
- 53.8"
- annual precipitation
- 335 days
- growing season, frost-free days
Occidental: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00046370 · Occidental, CA 58°F mean · 53.8" precip
TEMP-MILD · RANK-UPPER · PHOTO-FINISH · PRCP-WET · SWING-NARROW · COMF-TOP · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-MILD 58°F
- RANK-UPPER #4,665
- PHOTO-FINISH ≈ Napa County
- PRCP-WET 53.8"
- SWING-NARROW 18°F
- COMF-TOP 76/100
- LOAD-HEAT 3,087 HDD
- STN-1 USC00046370
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Napa County, CA (+ 0.1 °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.
- Occidental (this station) 58°F
- Hot Martinez Wtp, CA 58°F
- Near Napa County, CA 58°F
- Near Graton, CA 58°F
- Near Santa Rosa Sono…, CA 58°F
Climate Living Index · Occidental
Occidental: 76/100 · grade B
Occidental publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Occidental, not an official NOAA rating. Rankings still use Comfort Score 76/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 335 days/year | 100/100 · A |
| Normal heat + freeze calendar | 0 calendar days | 100/100 · A |
| Annual temperature balance | 57.6°F · 9.9° from 67.5°F | 68/100 · C |
| Precipitation balance | 53.8 in · 18.8 from 35 in | 33/100 · F |
Occidental · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Occidental is a temperate Köppen climate: Csb
Coldest-month mean 48.2°F and warmest-month mean 65.9°F place this station in temperate, dry-summer, warm summer climates (Csb). Class Csb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, dry-summer, warm summer.
- Köppen code
- Csb
- Group
- Temperate
- Warmest month
- 65.9°F
- Coldest month
- 48.2°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 · heating-led station
Where Occidental sits across the climate record
Three NOAA fields for Occidental's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 68th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Top 12% wettest
- Occidental's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 97%
- Warmest-to-coldest month gap for Occidental is compact versus 6,861 complete station-years.
How Occidental compares across U.S. station-mapped locations
Occidental's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
76 Top 31% score exceeds 69% 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%). This entry sits in this band.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 56°F (13°C) | 42°F (6°C) | 49°F (10°C) | 10.8" | 0.9 | 0.0 |
| February | 59°F (15°C) | 43°F (6°C) | 51°F (10°C) | 9.9" | 1.2 | 0.0 |
| March | 61°F (16°C) | 44°F (7°C) | 53°F (12°C) | 7.0" | 0.2 | 0.0 |
| April | 66°F (19°C) | 45°F (7°C) | 56°F (13°C) | 3.8" | 0.1 | 0.1 |
| May | 70°F (21°C) | 48°F (9°C) | 59°F (15°C) | 2.0" | 0.0 | 0.5 |
| June | 76°F (25°C) | 51°F (11°C) | 64°F (18°C) | 0.6" | 0.0 | 3.2 |
| July | 78°F (26°C) | 52°F (11°C) | 65°F (18°C) | 0.1" | 0.0 | 3.7 |
| August | 78°F (26°C) | 53°F (12°C) | 66°F (19°C) | 0.1" | 0.0 | 3.0 |
| September | 77°F (25°C) | 53°F (12°C) | 65°F (18°C) | 0.2" | 0.0 | 3.3 |
| October | 73°F (23°C) | 52°F (11°C) | 62°F (17°C) | 2.6" | 0.0 | 1.2 |
| November | 62°F (17°C) | 46°F (8°C) | 54°F (12°C) | 5.7" | 0.2 | 0.0 |
| December | 55°F (13°C) | 41°F (5°C) | 48°F (9°C) | 11.1" | 0.7 | 0.0 |
The year, day by day
The calendar barely moves in Occidental: no date carries a normal high of 90°F or a normal low at freezing. The year runs between 41°F near December 12 and 79°F near August 22.
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 41°F around December 12.
Where the wet dates fall
The likeliest wet date is February 9, when 43% of years recorded at least a hundredth of an inch. The driest is July 14 at 3%. Summed across the calendar, that is about 80 wet dates a year.
The widest day
June 27 carries the biggest normal gap between afternoon and dawn, 26°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Occidental.
Where Occidental Stands Nationally
The normal water year runs well above the national norm at roughly 54 inches.
Occidental earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall
12.3 days with precipitation
11.7 days with precipitation
12.5 days with precipitation
6.5 days with precipitation
4.7 days with precipitation
1.7 days with precipitation
0.8 days with precipitation
0.8 days with precipitation
1.4 days with precipitation
4.0 days with precipitation
8.6 days with precipitation
13.1 days with precipitation
Occidental's wet season runs through the cold months
December, January and February carry 59% of the year's precipitation here, while June through August contribute 1%. 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 an unusually narrow 17.7°F seasonal spread.
- Wettest month
- December, 11.1"
- Driest month
- August, 0.1"
- Wettest three months
- December, January, February (59% 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 Occidental, it arrives in quantity
53.8" of precipitation falls across only about 78 wet days here, averaging 0.69 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 78 a year, 21% of all days
- Average depth per wet day
- 0.69 inches
- Most wet days
- December, about 13
- Fewest wet days
- July, about 1
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 30
50% probability date
Last Spring Freeze
January 29
50% probability date
Growing Season
335 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
3,087
Higher = more heating needed
Cooling Degree Days
404
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside CA closest to Occidental 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 (58°F here).
- Big Water, UT 58°F · 0.0°F off
- Gate, OK 58°F · 0.0°F off
- Gladeville, TN 58°F · 0.0°F off
- Independence, KS 58°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (53.8" here), excluding temperature-peer places.
- Fletcher, NC 53.9" · 0.0" off
- Union City, TN 53.8" · 0.0" off
- Boothville, LA 53.9" · 0.1" off
- Banner Elk, NC 53.8" · 0.1" off
Data-derived climate profile
How Occidental's climate pattern fits together
heating led · wet · low swing
Heating is the larger measured load in Occidental, at 3,087 degree days versus 404 for cooling. Unlike a strongly continental record, however, its 17.7°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
The frost-free window extends for about 335 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.
Occidental's 17.7°F seasonal spread is compact even though precipitation is abundant. August and December mark the typical warm and cold ends of the calendar. The annual average is 58°F. Temperature is relatively steady; the monthly rows show how rain and snow observations vary across the calendar.
Alongside its heating load, Occidental carries 53.8 inches of precipitation in a normal year, inside PlainClimate's wet range. Snowfall is not added to the interpretation because its annual value is missing. That distinction matters because a wet annual total can arrive as rain, snow, or a mixture at different times.
These labels group NOAA 1991-2020 normals from Occidental's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Occidental, not an official NOAA class or a year-ahead forecast.
Questions about Occidental's climate
How much rain does Occidental get? ▼
How much energy does heating and cooling require in Occidental? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Occidental's primary station: OCCIDENTAL (USC00046370). 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 a census-designated place (GEOID 0653266), not an incorporated municipality. Match rule for Occidental: 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 Occidental 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.