Vallejo, 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 Vallejo's primary NOAA station, VALLEJO.
The climate verdict for Vallejo
A compact 21.6°F seasonal swing gives Vallejo, California a steadier-than-extreme annual shape. NOAA reports an annual average of 62°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.
- 62°F
- average temperature, NOAA 1991-2020 normal
- 100/100
- comfort score, above 99% of station-mapped location scores
- 21.5"
- precipitation, annual total
- 344 days
- frost-free days per growing season
Vallejo: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00049219 · Vallejo, CA 62°F mean · 21.5" precip
TEMP-MILD · RANK-UPPER · PHOTO-FINISH · PRCP-DRY · SWING-NARROW · COMF-TOP · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-MILD 62°F
- RANK-UPPER #5,420
- PHOTO-FINISH ≈ Avalon Catalina
- PRCP-DRY 21.5"
- SWING-NARROW 22°F
- COMF-TOP 100/100
- LOAD-HEAT 2,093 HDD
- STN-1 USC00049219
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Avalon Catalina, CA ( -0.4 °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.
- Vallejo (this station) 62°F
- Hot Ramona Fire Dept, CA 62°F
- Near Concord Buchana…, CA 62°F
- Near Concord Wwtp, CA 62°F
- Cold Avalon Catalina, CA 61°F
Climate Living Index · Vallejo
Vallejo: 85/100 · grade A
Vallejo publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Vallejo, not an official NOAA rating. Rankings still use Comfort Score 100/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 344 days/year | 100/100 · A |
| Normal heat + freeze calendar | 0 calendar days | 100/100 · A |
| Annual temperature balance | 61.6°F · 5.9° from 67.5°F | 82/100 · B |
| Precipitation balance | 21.5 in · 13.5 from 35 in | 53/100 · D |
Vallejo · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Vallejo is a temperate Köppen climate: Csb
Coldest-month mean 49.7°F and warmest-month mean 71.3°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
- 71.3°F
- Coldest month
- 49.7°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 · heating-led station
Where Vallejo sits across the climate record
Three NOAA fields for Vallejo's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 21% warmest
- Among 6,861 stations, Vallejo sits in the warmer third of annual means.
- Annual precipitation
- Drier than 70%
- Vallejo's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 96%
- Warmest-to-coldest month gap for Vallejo is compact versus 6,861 complete station-years.
How Vallejo compares across U.S. station-mapped locations
Vallejo'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
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 57°F (14°C) | 42°F (6°C) | 50°F (10°C) | 4.5" | 1.5 | 0.0 |
| February | 63°F (17°C) | 45°F (7°C) | 54°F (12°C) | 3.6" | 1.0 | 0.0 |
| March | 68°F (20°C) | 46°F (8°C) | 57°F (14°C) | 3.2" | 0.3 | 0.1 |
| April | 73°F (23°C) | 47°F (8°C) | 60°F (16°C) | 1.4" | 0.1 | 0.5 |
| May | 78°F (26°C) | 51°F (11°C) | 65°F (18°C) | 0.8" | 0.0 | 2.0 |
| June | 83°F (28°C) | 54°F (12°C) | 69°F (20°C) | 0.2" | 0.0 | 6.3 |
| July | 85°F (30°C) | 56°F (13°C) | 71°F (21°C) | 0.0" | 0.0 | 7.0 |
| August | 86°F (30°C) | 56°F (13°C) | 71°F (22°C) | 0.0" | 0.0 | 8.0 |
| September | 86°F (30°C) | 57°F (14°C) | 71°F (22°C) | 0.1" | 0.0 | 9.6 |
| October | 79°F (26°C) | 54°F (12°C) | 66°F (19°C) | 1.0" | 0.0 | 2.6 |
| November | 66°F (19°C) | 47°F (8°C) | 56°F (13°C) | 2.2" | 0.5 | 0.0 |
| December | 58°F (14°C) | 42°F (6°C) | 50°F (10°C) | 4.5" | 1.2 | 0.0 |
The year, day by day
The calendar barely moves in Vallejo: no date carries a normal high of 90°F or a normal low at freezing. The year runs between 41°F near January 1 and 87°F near August 31.
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 January 1.
The widest day
August 29 carries the biggest normal gap between afternoon and dawn, 31°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Vallejo.
Monthly Precipitation
Average monthly rainfall
Vallejo's wet season runs through the cold months
December, January and February carry 58% 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 21.6°F seasonal spread.
- Wettest month
- December, 4.5"
- Driest month
- July, 0.0"
- Wettest three months
- December, January, February (58% 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.
Frost Dates & Growing Season
First Fall Freeze
December 27
50% probability date
Last Spring Freeze
January 17
50% probability date
Growing Season
344 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
2,093
Higher = more heating needed
Cooling Degree Days
868
Higher = more cooling needed
Warmest Month
September
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside CA closest to Vallejo 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 (62°F here).
- Ada, OK 62°F · 0.0°F off
- Ardmore, TN 62°F · 0.0°F off
- Belhaven, NC 62°F · 0.0°F off
- Haleyville, AL 62°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (21.5" here), excluding temperature-peer places.
- Hayes Center, NE 21.5" · 0.0" off
- Valley City, ND 21.5" · 0.0" off
- Placerville, CO 21.5" · 0.0" off
- Madrid, NE 21.4" · 0.0" off
Data-derived climate profile
How Vallejo's climate pattern fits together
heating led · moderate · low swing
Heating is the larger measured load in Vallejo, at 2,093 degree days versus 868 for cooling. Unlike a strongly continental record, however, its 21.6°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 344 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.
Temperature varies within a narrow 21.6°F band across the normal year. September and January mark the typical warm and cold ends of the calendar. The annual average is 62°F. Monthly rows still matter, but they refine a steady profile rather than reveal two climatic extremes.
Vallejo's 21.5 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 Vallejo'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 Vallejo, not an official NOAA class or a year-ahead forecast.
Questions about Vallejo's climate
How much rain does Vallejo get? ▼
How many days above 90°F does Vallejo get? ▼
How much energy does heating and cooling require in Vallejo? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Vallejo's primary station: VALLEJO (USC00049219). 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 0681666). Match rule for Vallejo: 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 Vallejo 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.