Climate Comfort Score
95/100
Excellent
NOAA 1991–2020 normals 62°F annual avg Public-domain federal data
Vallejo, CA Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991–2020 normals →
- 62°F
- Avg annual temp
- 95/100
- Comfort score
- 21.5"
- Annual precip
- 344d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Vallejo
Vallejo, California averages 62°F a year and scores 95/100 on the comfort index - excellent, milder than 98% of U.S. cities.
- 62°F
- average temperature, NOAA 1991-2020 normal
- 95/100
- comfort score, milder than 98% of U.S. cities
- 21.5"
- precipitation, annual total
- 344 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
62°F (16°C)
Avg High
74°F
Avg Low
50°F
Annual Precip
21.5"
Comfort Score
95/100
Excellent
Avg Annual Temperature
62°F
30-year mean (NOAA NCEI)
Annual Precipitation
21.5"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Vallejo) 95.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Vallejo area.
How Vallejo compares to every U.S. city
Vallejo's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
95 Top 2% higher than 98% 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 Vallejo
MethodologyVallejo'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 | 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 |
Monthly Precipitation
Average monthly rainfall
January 4.5"
February 3.6"
March 3.2"
April 1.4"
May 0.8"
June 0.2"
July 0.0"
August 0.0"
September 0.1"
October 1.0"
November 2.2"
December 4.5"
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
What Vallejo's climate means for you
Vallejo runs 62°F a year - peaking in September, coldest in January.
- Gardeners get about 344 frost-free days, with the last spring freeze near January 17 - plan the planting calendar around it, not the regional average.
- Energy bills track 2,093 heating and 868 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: Vallejo, CA
Based on station USC00049219 feeding NOAA's 1991–2020 climate normals, Vallejo, California averages 62°F a year, ranging from a mean daily high of 74°F to a mean daily low of 50°F. September is typically the warmest month of the year, while January is the coldest. Because these figures are thirty-year averages rather than any single year's readings, they describe the typical month, not a forecast for it.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Vallejo receives roughly 21.5 inches of precipitation each year, predominantly as rainfall. The frost-free season averages 344 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near January 17 and the first fall freeze near December 27. For energy use, 2,093 heating degree days and 868 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Vallejo scores 95/100 (Excellent), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Use the monthly tables above to plan around specific windows, shoulder seasons for mild highs and lows, peak summer for September-driven heat, or deep winter for January-driven cold. All figures here are thirty-year averages: any single year may run warmer, wetter, drier, or cooler than the normal, so treat them as planning guidance rather than forecasts.
Frequently Asked Questions
What is the average temperature in Vallejo, CA? ▼
The average annual temperature in Vallejo, California is 62°F. The warmest month averages 86°F (30°C) and the coldest averages 42°F (6°C).
How much rain does Vallejo get? ▼
Vallejo receives 21.5 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Vallejo? ▼
Vallejo has a climate comfort score of 95/100 (Excellent), milder than 98% of U.S. cities in the PlainClimate database.
When is the growing season in Vallejo? ▼
Vallejo has approximately 344 frost-free days per year, with the last spring freeze around January 17 and the first fall freeze around December 27.
How much energy does heating and cooling require in Vallejo? ▼
Vallejo has 2,093 heating degree days and 868 cooling degree days annually, a heating-dominated climate. 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 Vallejo climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00049219 near Vallejo.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00049219. 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.