Climate Comfort Score
100/100
Excellent
NOAA 1991–2020 normals 62°F annual avg Public-domain federal data
Fairfield, CA Climate
Average temperature, precipitation, and a comfort score, drawn from NOAA NCEI 1991–2020 normals →
- 62°F
- Avg annual temp
- 100/100
- Comfort score
- 24.5"
- Annual precip
- 333d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Fairfield
Fairfield, California averages 62°F a year and scores 100/100 on the comfort index - excellent, milder than 99% of U.S. cities.
- 62°F
- yearly average temperature, NOAA normal
- 100/100
- comfort score, milder than 99% of U.S. cities
- 24.5"
- annual precipitation
- 333 days
- growing season, frost-free days
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
62°F (17°C)
Avg High
74°F
Avg Low
50°F
Annual Precip
24.5"
Annual Snow
0.0"
Comfort Score
100/100
Excellent
Avg Annual Temperature
62°F
30-year mean (NOAA NCEI)
Annual Precipitation
24.5"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Fairfield) 100.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Fairfield area.
How Fairfield compares to every U.S. city
Fairfield'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 Fairfield
MethodologyZooming out from Fairfield's own normal, the chart below shows how the U.S. land temperature anomaly has tracked the global mean since 1900 - the most recent decade sits warmer than the 30-year mean shown here.
- 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 | 57°F (14°C) | 40°F (5°C) | 49°F (9°C) | 4.7" | 0.0" | 3.1 | 0.0 |
| February | 62°F (16°C) | 43°F (6°C) | 52°F (11°C) | 5.0" | 0.0" | 0.5 | 0.0 |
| March | 66°F (19°C) | 45°F (7°C) | 56°F (13°C) | 3.3" | 0.0" | 0.2 | 0.0 |
| April | 71°F (22°C) | 48°F (9°C) | 60°F (15°C) | 1.5" | 0.0" | 0.2 | 0.6 |
| May | 78°F (25°C) | 52°F (11°C) | 65°F (18°C) | 0.7" | 0.0" | 0.0 | 3.6 |
| June | 85°F (30°C) | 56°F (13°C) | 71°F (22°C) | 0.2" | 0.0" | 0.1 | 10.2 |
| July | 90°F (32°C) | 58°F (14°C) | 74°F (23°C) | 0.0" | 0.0" | 0.0 | 15.3 |
| August | 89°F (32°C) | 58°F (14°C) | 74°F (23°C) | 0.0" | 0.0" | 0.0 | 14.5 |
| September | 87°F (31°C) | 57°F (14°C) | 72°F (22°C) | 0.1" | 0.0" | 0.0 | 12.1 |
| October | 78°F (26°C) | 52°F (11°C) | 65°F (18°C) | 1.1" | 0.0" | 0.0 | 3.3 |
| November | 66°F (19°C) | 45°F (7°C) | 55°F (13°C) | 2.5" | 0.0" | 0.4 | 0.0 |
| December | 57°F (14°C) | 40°F (5°C) | 48°F (9°C) | 5.4" | 0.0" | 3.5 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 4.7"
10.4 days with precipitation
February 5.0"
10.0 days with precipitation
March 3.3"
9.4 days with precipitation
April 1.5"
5.1 days with precipitation
May 0.7"
3.2 days with precipitation
June 0.2"
0.8 days with precipitation
July 0.0"
0.0 days with precipitation
August 0.0"
0.2 days with precipitation
September 0.1"
0.6 days with precipitation
October 1.1"
2.7 days with precipitation
November 2.5"
6.5 days with precipitation
December 5.4"
10.1 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
December 14
50% probability date
Last Spring Freeze
January 15
50% probability date
Growing Season
333 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
2,307
Higher = more heating needed
Cooling Degree Days
1,113
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
What Fairfield's climate means for you
Fairfield runs 62°F a year - peaking in July, coldest in December.
- Gardeners get about 333 frost-free days, with the last spring freeze near January 15 - plan the planting calendar around it, not the regional average.
- Energy bills track 2,307 heating and 1,113 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: Fairfield, CA
In Fairfield, California, the NOAA 1991–2020 climate normals put the annual average temperature at 62°F, ranging from a mean daily high of 74°F to a mean daily low of 50°F. July is typically the warmest month of the year, while December is the coldest. As thirty-year averages computed from station USC00042934, these numbers smooth out year-to-year noise into a working baseline for a typical month.
Anyone planning to live, garden, or travel in Fairfield should weigh precipitation alongside temperature: the annual average runs 24.5 inches, with negligible snowfall. The frost-free season averages 333 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near January 15 and the first fall freeze near December 14. And on the energy front, 2,307 heating degree days and 1,113 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Fairfield scores 100/100 (Excellent), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above turn that into a planning tool: expect the mildest highs and lows in the shoulder seasons, July-driven heat at the peak of summer, and December-driven cold at the depth of winter. Every number here is a thirty-year average, not a forecast, so any given year can and does run warmer, cooler, wetter, or drier than the normal.
Frequently Asked Questions
What is the average temperature in Fairfield, CA? ▼
The average annual temperature in Fairfield, California is 62°F. The warmest month averages 90°F (32°C) and the coldest averages 40°F (5°C).
How much rain does Fairfield get? ▼
Fairfield receives 24.5 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Fairfield? ▼
Fairfield 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 Fairfield? ▼
Fairfield has approximately 333 frost-free days per year, with the last spring freeze around January 15 and the first fall freeze around December 14.
How much energy does heating and cooling require in Fairfield? ▼
Fairfield has 2,307 heating degree days and 1,113 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 Fairfield climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00042934 near Fairfield.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00042934. 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.