Climate Comfort Score
87/100
Excellent
NOAA 1991–2020 normals 58°F annual avg Public-domain federal data
Petaluma, CA Climate
Pulled from NOAA NCEI 1991–2020 normals →: average temperature, precipitation, and comfort score
- 58°F
- Avg annual temp
- 87/100
- Comfort score
- 25.6"
- Annual precip
- 270d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Petaluma
Petaluma, California averages 58°F a year and scores 87/100 on the comfort index - excellent, milder than 89% of U.S. cities.
- 58°F
- average temperature, NOAA 1991-2020 normal
- 87/100
- comfort score, milder than 89% of U.S. cities
- 25.6"
- yearly precipitation total
- 270 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
58°F (14°C)
Avg High
70°F
Avg Low
46°F
Annual Precip
25.6"
Annual Snow
0.0"
Comfort Score
87/100
Excellent
Avg Annual Temperature
58°F
30-year mean (NOAA NCEI)
Annual Precipitation
25.6"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Petaluma) 87.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Petaluma area.
How Petaluma compares to every U.S. city
Petaluma's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
87 Top 11% higher than 89% 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 Petaluma
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for Petaluma 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 | 58°F (14°C) | 39°F (4°C) | 48°F (9°C) | 4.8" | 0.0" | 6.1 | 0.0 |
| February | 61°F (16°C) | 40°F (5°C) | 51°F (10°C) | 5.2" | 0.0" | 3.2 | 0.0 |
| March | 65°F (18°C) | 42°F (5°C) | 53°F (12°C) | 3.3" | 0.0" | 0.8 | 0.0 |
| April | 68°F (20°C) | 44°F (7°C) | 56°F (13°C) | 1.7" | 0.0" | 0.5 | 0.1 |
| May | 72°F (22°C) | 47°F (9°C) | 60°F (15°C) | 0.9" | 0.0" | 0.0 | 0.9 |
| June | 78°F (26°C) | 50°F (10°C) | 64°F (18°C) | 0.3" | 0.0" | 0.0 | 2.9 |
| July | 81°F (27°C) | 52°F (11°C) | 67°F (19°C) | 0.0" | 0.0" | 0.0 | 3.7 |
| August | 81°F (27°C) | 53°F (12°C) | 67°F (19°C) | 0.1" | 0.0" | 0.0 | 4.4 |
| September | 82°F (28°C) | 51°F (11°C) | 67°F (19°C) | 0.1" | 0.0" | 0.0 | 6.4 |
| October | 76°F (25°C) | 48°F (9°C) | 62°F (17°C) | 1.3" | 0.0" | 0.0 | 2.2 |
| November | 66°F (19°C) | 42°F (6°C) | 54°F (12°C) | 2.7" | 0.0" | 2.8 | 0.0 |
| December | 58°F (14°C) | 38°F (4°C) | 48°F (9°C) | 5.2" | 0.0" | 7.6 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 4.8"
12.0 days with precipitation
February 5.2"
11.0 days with precipitation
March 3.3"
10.2 days with precipitation
April 1.7"
6.4 days with precipitation
May 0.9"
3.7 days with precipitation
June 0.3"
1.3 days with precipitation
July 0.0"
0.1 days with precipitation
August 0.1"
0.3 days with precipitation
September 0.1"
1.0 days with precipitation
October 1.3"
3.6 days with precipitation
November 2.7"
7.8 days with precipitation
December 5.2"
12.1 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
November 25
50% probability date
Last Spring Freeze
February 28
50% probability date
Growing Season
270 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
2,853
Higher = more heating needed
Cooling Degree Days
317
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
What Petaluma's climate means for you
Petaluma runs 58°F a year - peaking in August, coldest in December.
- Gardeners get about 270 frost-free days, with the last spring freeze near February 28 - plan the planting calendar around it, not the regional average.
- Energy bills track 2,853 heating and 317 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: Petaluma, CA
An annual average temperature of 58°F, ranging from a mean daily high of 70°F to a mean daily low of 46°F is what the NOAA 1991–2020 climate normals report for Petaluma, California. August is typically the warmest month of the year, while December is the coldest. That baseline comes from station USC00046826 and thirty years of averaging, so it reflects a typical month rather than any one year's swings.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Petaluma receives roughly 25.6 inches of precipitation each year, with negligible snowfall. The frost-free season averages 270 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near February 28 and the first fall freeze near November 25. For energy use, 2,853 heating degree days and 317 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Petaluma scores 87/100 (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, August-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 Petaluma, CA? ▼
The average annual temperature in Petaluma, California is 58°F. The warmest month averages 82°F (28°C) and the coldest averages 38°F (4°C).
How much rain does Petaluma get? ▼
Petaluma receives 25.6 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Petaluma? ▼
Petaluma has a climate comfort score of 87/100 (Excellent), milder than 89% of U.S. cities in the PlainClimate database.
When is the growing season in Petaluma? ▼
Petaluma has approximately 270 frost-free days per year, with the last spring freeze around February 28 and the first fall freeze around November 25.
How much energy does heating and cooling require in Petaluma? ▼
Petaluma has 2,853 heating degree days and 317 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 Petaluma climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00046826 near Petaluma.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00046826. 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.