Climate Comfort Score
77/100
Good
NOAA 1991–2020 normals 66°F annual avg Public-domain federal data
Fullerton Muni, CA Climate
Explore average temperature, rainfall, and comfort score sourced from NOAA NCEI's 1991–2020 climate normals →
- 66°F
- Avg annual temp
- 77/100
- Comfort score
- 11.9"
- Annual precip
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Fullerton Muni
Fullerton Muni, California averages 66°F a year and scores 77/100 on the comfort index - good, milder than 72% of U.S. cities.
- 66°F
- yearly average temperature, NOAA normal
- 77/100
- comfort score, milder than 72% of U.S. cities
- 11.9"
- annual precipitation
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
66°F (19°C)
Avg High
76°F
Avg Low
56°F
Annual Precip
11.9"
Comfort Score
77/100
Good
Avg Annual Temperature
66°F
30-year mean (NOAA NCEI)
Annual Precipitation
11.9"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Fullerton Muni) 77.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Good for the Fullerton Muni area.
How Fullerton Muni compares to every U.S. city
Fullerton Muni's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
77 Top 28% higher than 72% 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 Fullerton Muni
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for Fullerton Muni 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 | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 69°F (20°C) | 46°F (8°C) | 58°F (14°C) | 2.9" | 0.1 | 0.1 |
| February | 69°F (21°C) | 48°F (9°C) | 59°F (15°C) | 3.0" | 0.0 | 0.5 |
| March | 71°F (22°C) | 52°F (11°C) | 61°F (16°C) | 1.7" | 0.0 | 1.0 |
| April | 74°F (23°C) | 54°F (12°C) | 64°F (18°C) | 0.6" | 0.0 | 1.6 |
| May | 76°F (24°C) | 58°F (15°C) | 67°F (19°C) | 0.3" | 0.0 | 1.8 |
| June | 79°F (26°C) | 63°F (17°C) | 71°F (22°C) | 0.1" | 0.0 | 2.1 |
| July | 84°F (29°C) | 66°F (19°C) | 75°F (24°C) | 0.0" | 0.0 | 6.4 |
| August | 87°F (30°C) | 66°F (19°C) | 77°F (25°C) | 0.0" | 0.0 | 9.4 |
| September | 85°F (30°C) | 65°F (18°C) | 75°F (24°C) | 0.1" | 0.0 | 9.1 |
| October | 80°F (27°C) | 58°F (15°C) | 69°F (21°C) | 0.5" | 0.0 | 5.6 |
| November | 74°F (23°C) | 51°F (10°C) | 62°F (17°C) | 0.7" | 0.0 | 1.8 |
| December | 68°F (20°C) | 46°F (8°C) | 57°F (14°C) | 1.9" | 0.1 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 2.9"
5.2 days with precipitation
February 3.0"
6.8 days with precipitation
March 1.7"
5.3 days with precipitation
April 0.6"
3.5 days with precipitation
May 0.3"
1.8 days with precipitation
June 0.1"
0.5 days with precipitation
July 0.0"
0.3 days with precipitation
August 0.0"
0.2 days with precipitation
September 0.1"
0.8 days with precipitation
October 0.5"
3.0 days with precipitation
November 0.7"
4.6 days with precipitation
December 1.9"
6.3 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
N/A
50% probability date
Last Spring Freeze
N/A
50% probability date
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
1,051
Higher = more heating needed
Cooling Degree Days
1,507
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
Nearby Cities
What Fullerton Muni's climate means for you
Fullerton Muni runs 66°F a year - peaking in August, coldest in December.
- Energy bills track 1,051 heating and 1,507 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: Fullerton Muni, CA
In Fullerton Muni, California, the NOAA 1991–2020 climate normals put the annual average temperature at 66°F, ranging from a mean daily high of 76°F to a mean daily low of 56°F. August is typically the warmest month of the year, while December is the coldest. As thirty-year averages computed from station USW00003166, these numbers smooth out year-to-year noise into a working baseline for a typical month.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Fullerton Muni receives roughly 11.9 inches of precipitation each year, predominantly as rainfall. Growing-season length varies with elevation and microclimate. For energy use, 1,051 heating degree days and 1,507 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Fullerton Muni scores 77/100 (Good), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Shoulder seasons bring the mildest highs and lows in the monthly tables above, summer brings August-driven heat, and winter brings December-driven cold - use that rhythm for planning. These figures are thirty-year averages rather than forecasts, so a specific year may still run warmer, cooler, wetter, or drier than what's shown.
Frequently Asked Questions
What is the average temperature in Fullerton Muni, CA? ▼
The average annual temperature in Fullerton Muni, California is 66°F. The warmest month averages 87°F (30°C) and the coldest averages 46°F (8°C).
How much rain does Fullerton Muni get? ▼
Fullerton Muni receives 11.9 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Fullerton Muni? ▼
Fullerton Muni has a climate comfort score of 77/100 (Good), milder than 72% of U.S. cities in the PlainClimate database.
When is the growing season in Fullerton Muni? ▼
Growing season data is not available for Fullerton Muni.
How much energy does heating and cooling require in Fullerton Muni? ▼
Fullerton Muni has 1,051 heating degree days and 1,507 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 Fullerton Muni climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USW00003166 near Fullerton Muni.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USW00003166. 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.