Climate Comfort Score
92/100
Excellent
2026 data Public-data reference. official source
Fairfield, CA Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991-2020 normals →
30-year climate normals from 1 weather station (1991-2020).
Fairfield, California has an average annual temperature of 62°F and a climate comfort score of 92/100 (Excellent). Annual precipitation totals 24.5". Based on NOAA 30-year normals (1991–2020).
Avg Temperature
62°F (17°C)
Avg High
74°F
Avg Low
50°F
Annual Precip
24.5"
Annual Snow
0.0"
Comfort Score
92/100
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) 92.0%
National median (≈55)
PlainClimate composite — temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Fairfield area.
Warming context for Fairfield
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for Fairfield captures average conditions across the spread shown — the most recent decade is 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 | 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
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
Related Data
PlainEnviro
EPA environmental data — pollution, water quality, and environmental health by location
PlainCarbon
Carbon emissions data — greenhouse gas reporting and facility-level CO2 data
PlainHazard
Natural disaster data — weather-related hazards, FEMA declarations, and risk profiles
PlainAirData
EPA air quality data — AQI readings, pollutant levels, and air quality trends
Climate Guides
Climate Insight: Fairfield, CA
The NOAA 1991–2020 climate normals describe Fairfield, California as a location with an annual average temperature of 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. These thirty-year averages, computed from station USC00042934, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Fairfield receives roughly 24.5 inches of precipitation each year, with seasonal snowfall possible. Growing-season length varies with elevation and microclimate, with the last spring freeze near January 15 and the first fall freeze near December 14. For energy use, 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 92/100 (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 July-driven heat, or deep winter for December-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 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 92/100 (Excellent). This score considers temperature mildness, humidity, precipitation, and extreme weather frequency.
When is the growing season in Fairfield? ▼
Growing season data is not available for Fairfield.
How much energy does heating and cooling require in Fairfield? ▼
Fairfield has 2,307 heating degree days and 1,113 cooling degree days annually. Higher heating degree days indicate greater winter energy demand, while higher cooling degree days indicate greater summer cooling needs.
Where does this Fairfield climate data come from? ▼
All climate data comes from NOAA U.S. Climate Normals v1.0.1, covering the 30-year period from 1991 to 2020. Data is collected from weather station USC00042934. These 30-year averages are the standard reference for typical weather conditions.
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
