Vacaville, CA Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Vacaville's primary NOAA station, VACAVILLE.
The climate verdict for Vacaville
Vacaville, 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
- annual average temperature (NOAA normal)
- 100/100
- comfort score, above 99% of station-mapped location scores
- 25.6"
- precipitation, annual total
- 314 days
- frost-free days per growing season
Vacaville: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00049200 · Vacaville, CA 64°F mean · 25.6" 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 ≈ Altus
- PRCP-MID 25.6"
- SWING-MID 30°F
- COMF-TOP 100/100
- LOAD-MIX H/C balanced
- STN-1 USC00049200
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Altus, OK (+ 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.
- Vacaville (this station) 64°F
- Hot Auburn, AL 64°F
- Near Altus, OK 64°F
- Near Aspermont, TX 64°F
- Near Atlanta Hartsfi…, GA 64°F
Climate Living Index · Vacaville
Vacaville: 82/100 · grade B
Vacaville publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Vacaville, not an official NOAA rating. Rankings still use Comfort Score 100/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 314 days/year | 100/100 · A |
| Snowfall burden | 0.0 inches/year | 90/100 · A |
| Annual temperature balance | 63.6°F · 3.9° from 67.5°F | 88/100 · A |
| Normal heat + freeze calendar | 104 calendar days | 74/100 · B |
| Precipitation balance | 25.6 in · 9.4 from 35 in | 67/100 · C |
Vacaville · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Vacaville is a temperate Köppen climate: Csa
Coldest-month mean 48.6°F and warmest-month mean 78.7°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
- 78.7°F
- Coldest month
- 48.6°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 Vacaville sits across the climate record
Three NOAA fields for Vacaville'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, Vacaville sits in the warmer third of annual means.
- Annual precipitation
- 35th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Narrower than 90%
- Warmest-to-coldest month gap for Vacaville is compact versus 6,861 complete station-years.
How Vacaville compares across U.S. station-mapped locations
Vacaville'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 | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 58°F (14°C) | 40°F (4°C) | 49°F (9°C) | 5.5" | 0.0" | 5.1 | 0.0 |
| February | 63°F (17°C) | 42°F (6°C) | 53°F (11°C) | 5.1" | 0.0" | 1.8 | 0.0 |
| March | 69°F (20°C) | 45°F (7°C) | 57°F (14°C) | 3.4" | 0.0" | 0.7 | 0.0 |
| April | 75°F (24°C) | 48°F (9°C) | 62°F (16°C) | 1.2" | 0.0" | 0.1 | 1.3 |
| May | 83°F (28°C) | 53°F (12°C) | 68°F (20°C) | 0.8" | 0.0" | 0.0 | 8.2 |
| June | 91°F (33°C) | 58°F (14°C) | 74°F (23°C) | 0.2" | 0.0" | 0.0 | 15.9 |
| July | 97°F (36°C) | 60°F (16°C) | 79°F (26°C) | 0.0" | 0.0" | 0.0 | 27.1 |
| August | 97°F (36°C) | 60°F (15°C) | 78°F (26°C) | 0.1" | 0.0" | 0.0 | 25.3 |
| September | 92°F (33°C) | 58°F (14°C) | 75°F (24°C) | 0.1" | 0.0" | 0.0 | 19.1 |
| October | 81°F (27°C) | 52°F (11°C) | 67°F (19°C) | 1.0" | 0.0" | 0.0 | 4.6 |
| November | 67°F (19°C) | 45°F (7°C) | 56°F (13°C) | 2.4" | 0.0" | 1.0 | 0.0 |
| December | 58°F (14°C) | 40°F (4°C) | 49°F (9°C) | 5.7" | 0.0" | 5.5 | 0.0 |
The year, day by day
The year in Vacaville runs from a mild 39°F around January 1 to 98°F at the peak near July 22, and the normal low never reaches freezing on any date in the record.
When the heat sits
Normal highs reach 90°F from June 13 through September 24, covering 104 dates. The broader mild season, normal highs of 70°F or more, runs March 25 to November 8.
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 January 8, when 38% of years recorded at least a hundredth of an inch. The driest is July 21 at 0%. Summed across the calendar, that is about 62 wet dates a year.
The widest day
July 26 carries the biggest normal gap between afternoon and dawn, 38°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Vacaville.
Where Vacaville Stands Nationally
Summers here run among the most heat-heavy normals calendars in the country: on about 104 days a year the normal daily high itself reaches 90°F — a count fewer than one station in ten exceeds.
Day-to-night contrast is extreme by national standards — the widest normal daily swing reaches about 38°F, sharper than nine in ten ranked stations see.
Vacaville earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall and snowfall
12.0 days with precipitation
11.0 days with precipitation
8.4 days with precipitation
5.0 days with precipitation
3.7 days with precipitation
1.1 days with precipitation
0.1 days with precipitation
0.2 days with precipitation
0.5 days with precipitation
2.6 days with precipitation
6.5 days with precipitation
10.5 days with precipitation
Vacaville's wet season runs through the cold months
December, January and February carry 64% 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 a 30.1°F seasonal spread.
- Wettest month
- December, 5.7"
- Driest month
- July, 0.0"
- Wettest three months
- December, January, February (64% 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 Vacaville, it arrives in quantity
25.6" of precipitation falls across only about 62 wet days here, averaging 0.42 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 62 a year, 17% of all days
- Average depth per wet day
- 0.42 inches
- Most wet days
- January, about 12
- 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.
Vacaville's record shows no measurable snowfall
This station measured snowfall across the 1991-2020 period and recorded none: the annual normal is 0.0 inches. That is a measured zero rather than missing data, which is a meaningful distinction here , most stations in the database simply do not report snow at all, and those pages say nothing about it.
A thirty-year normal of zero describes the typical year at this station. It is not a claim that snow has never fallen in the area.
Frost Dates & Growing Season
First Fall Freeze
December 11
50% probability date
Last Spring Freeze
January 31
50% probability date
Growing Season
314 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
2,149
Higher = more heating needed
Cooling Degree Days
1,677
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside CA closest to Vacaville 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).
- Altus, OK 64°F · 0.0°F off
- Aspermont, TX 64°F · 0.0°F off
- Auburn, AL 64°F · 0.0°F off
- Cleveland, MS 64°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (25.6" here), excluding temperature-peer places.
- Tilden, TX 25.6" · 0.0" off
- Quanah, TX 25.6" · 0.0" off
- Phillipsburg, KS 25.6" · 0.0" off
- Kearney, NE 25.6" · 0.0" off
Data-derived climate profile
How Vacaville's climate pattern fits together
mixed demand · moderate · mid swing
July and January mark the typical warm and cold ends of the calendar in Vacaville's middle-range seasonal profile. The measured spread is 30.1°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 Vacaville's normal, at 2,149 and 1,677 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 314 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.
Vacaville's 25.6 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Recorded annual snowfall is negligible. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from Vacaville'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 Vacaville, the bands are descriptive ranges rather than an official NOAA classification or a forecast.
Questions about Vacaville's climate
How much rain does Vacaville get? ▼
How many days above 90°F does Vacaville get? ▼
How much energy does heating and cooling require in Vacaville? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Vacaville's primary station: VACAVILLE (USC00049200). 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 0681554). Match rule for Vacaville: 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 Vacaville 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.