Climate Comfort Score
100/100
Excellent
NOAA 1991–2020 normals 64°F annual avg Public-domain federal data
Vacaville, CA Climate
Explore average temperature, rainfall, and comfort score sourced from NOAA NCEI's 1991–2020 climate normals →
- 64°F
- Avg annual temp
- 100/100
- Comfort score
- 25.6"
- Annual precip
- 314d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Vacaville
Vacaville, California averages 64°F a year and scores 100/100 on the comfort index - excellent, milder than 99% of U.S. cities.
- 64°F
- annual average temperature (NOAA normal)
- 100/100
- comfort score, milder than 99% of U.S. cities
- 25.6"
- precipitation, annual total
- 314 days
- frost-free days per growing season
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
64°F (18°C)
Avg High
77°F
Avg Low
50°F
Annual Precip
25.6"
Annual Snow
0.0"
Comfort Score
100/100
Excellent
Avg Annual Temperature
64°F
30-year mean (NOAA NCEI)
Annual Precipitation
25.6"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Vacaville) 100.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Vacaville area.
How Vacaville compares to every U.S. city
Vacaville's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
100 Top 1% higher than 99% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Vacaville
MethodologyVacaville's NOAA 1991-2020 normal sits inside a longer story: U.S. land temperatures have been tracking (and drifting from) the global mean since 1900, and the chart below shows that spread, with the most recent decade running warmer than the 30-year mean.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
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 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 5.5"
12.0 days with precipitation
February 5.1"
11.0 days with precipitation
March 3.4"
8.4 days with precipitation
April 1.2"
5.0 days with precipitation
May 0.8"
3.7 days with precipitation
June 0.2"
1.1 days with precipitation
July 0.0"
0.1 days with precipitation
August 0.1"
0.2 days with precipitation
September 0.1"
0.5 days with precipitation
October 1.0"
2.6 days with precipitation
November 2.4"
6.5 days with precipitation
December 5.7"
10.5 days with precipitation
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
What Vacaville's climate means for you
Vacaville runs 64°F a year - peaking in July, coldest in January.
- Gardeners get about 314 frost-free days, with the last spring freeze near January 31 - plan the planting calendar around it, not the regional average.
- Energy bills track 2,149 heating and 1,677 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Vacaville, CA
Vacaville, California runs an annual average of 64°F, ranging from a mean daily high of 77°F to a mean daily low of 50°F, per NOAA's 1991–2020 climate normals. July is typically the warmest month of the year, while January is the coldest. Drawn from station USC00049200, these thirty-year averages smooth out year-to-year swings into a baseline for what a typical month looks like here.
Anyone planning to live, garden, or travel in Vacaville should weigh precipitation alongside temperature: the annual average runs 25.6 inches, with negligible snowfall. The frost-free season averages 314 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near January 31 and the first fall freeze near December 11. And on the energy front, 2,149 heating degree days and 1,677 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Vacaville scores 100/100 (Excellent), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above are the practical planning tool: mild highs and lows land in the shoulder seasons, July-driven heat peaks in summer, and January-driven cold sets in over deep winter. These are thirty-year averages, not a forecast - any single year can run warmer, wetter, drier, or cooler than the normal.
Frequently Asked Questions
What is the average temperature in Vacaville, CA? ▼
The average annual temperature in Vacaville, California is 64°F. The warmest month averages 97°F (36°C) and the coldest averages 40°F (4°C).
How much rain does Vacaville get? ▼
Vacaville receives 25.6 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Vacaville? ▼
Vacaville has a climate comfort score of 100/100 (Excellent), milder than 99% of U.S. cities in the PlainClimate database.
When is the growing season in Vacaville? ▼
Vacaville has approximately 314 frost-free days per year, with the last spring freeze around January 31 and the first fall freeze around December 11.
How much energy does heating and cooling require in Vacaville? ▼
Vacaville has 2,149 heating degree days and 1,677 cooling degree days annually, a fairly balanced heating/cooling split. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Vacaville climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00049200 near Vacaville.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00049200. For informational purposes only.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.