Climate Comfort Score
82/100
Excellent
NOAA 1991–2020 normals 58°F annual avg Public-domain federal data
Santa Rosa Sonoma CO, CA Climate
Explore average temperature, rainfall, and comfort score sourced from NOAA NCEI's 1991–2020 climate normals →
- 58°F
- Avg annual temp
- 82/100
- Comfort score
- 33.8"
- Annual precip
- 263d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Santa Rosa Sonoma CO
Santa Rosa Sonoma CO, California averages 58°F a year and scores 82/100 on the comfort index - excellent, milder than 83% of U.S. cities.
- 58°F
- annual average temperature (NOAA normal)
- 82/100
- comfort score, milder than 83% of U.S. cities
- 33.8"
- annual precipitation
- 263 days
- frost-free 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 (15°C)
Avg High
72°F
Avg Low
45°F
Annual Precip
33.8"
Comfort Score
82/100
Excellent
Avg Annual Temperature
58°F
30-year mean (NOAA NCEI)
Annual Precipitation
33.8"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Santa Rosa Sonoma CO) 82.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Santa Rosa Sonoma CO area.
How Santa Rosa Sonoma CO compares to every U.S. city
Santa Rosa Sonoma CO's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
82 Top 17% higher than 83% 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 Santa Rosa Sonoma CO
MethodologySince 1900, U.S. land temperatures have tracked (and diverged from) the global mean - the chart below shows how. Santa Rosa Sonoma CO's current NOAA 1991-2020 normal sits within that longer spread, and the most recent decade runs 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 | 58°F (14°C) | 38°F (3°C) | 48°F (9°C) | 6.7" | 9.1 | 0.0 |
| February | 62°F (17°C) | 39°F (4°C) | 51°F (10°C) | 6.7" | 5.0 | 0.0 |
| March | 65°F (18°C) | 41°F (5°C) | 53°F (12°C) | 4.6" | 1.2 | 0.0 |
| April | 69°F (21°C) | 43°F (6°C) | 56°F (13°C) | 2.1" | 0.5 | 0.6 |
| May | 75°F (24°C) | 47°F (8°C) | 61°F (16°C) | 1.3" | 0.0 | 2.0 |
| June | 82°F (28°C) | 50°F (10°C) | 66°F (19°C) | 0.3" | 0.0 | 6.1 |
| July | 84°F (29°C) | 52°F (11°C) | 68°F (20°C) | 0.0" | 0.0 | 6.6 |
| August | 84°F (29°C) | 52°F (11°C) | 68°F (20°C) | 0.1" | 0.0 | 7.3 |
| September | 83°F (29°C) | 50°F (10°C) | 67°F (19°C) | 0.1" | 0.0 | 7.8 |
| October | 77°F (25°C) | 46°F (8°C) | 61°F (16°C) | 1.6" | 0.2 | 3.1 |
| November | 65°F (19°C) | 40°F (5°C) | 53°F (12°C) | 3.6" | 4.1 | 0.0 |
| December | 58°F (14°C) | 37°F (3°C) | 47°F (8°C) | 6.8" | 10.9 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 6.7"
12.3 days with precipitation
February 6.7"
11.1 days with precipitation
March 4.6"
11.0 days with precipitation
April 2.1"
7.5 days with precipitation
May 1.3"
3.7 days with precipitation
June 0.3"
1.5 days with precipitation
July 0.0"
0.3 days with precipitation
August 0.1"
0.2 days with precipitation
September 0.1"
1.7 days with precipitation
October 1.6"
4.3 days with precipitation
November 3.6"
9.3 days with precipitation
December 6.8"
12.6 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
November 20
50% probability date
Last Spring Freeze
March 2
50% probability date
Growing Season
263 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
2,904
Higher = more heating needed
Cooling Degree Days
410
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
What Santa Rosa Sonoma CO's climate means for you
Santa Rosa Sonoma CO runs 58°F a year - peaking in August, coldest in December.
- Gardeners get about 263 frost-free days, with the last spring freeze near March 2 - plan the planting calendar around it, not the regional average.
- Energy bills track 2,904 heating and 410 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: Santa Rosa Sonoma CO, CA
Santa Rosa Sonoma CO, California runs an annual average of 58°F, ranging from a mean daily high of 72°F to a mean daily low of 45°F, per NOAA's 1991–2020 climate normals. August is typically the warmest month of the year, while December is the coldest. Drawn from station USW00023213, these thirty-year averages smooth out year-to-year swings into a baseline for what a typical month looks like here.
Anyone planning to live, garden, or travel in Santa Rosa Sonoma CO should weigh precipitation alongside temperature: the annual average runs 33.8 inches, predominantly as rainfall. The frost-free season averages 263 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near March 2 and the first fall freeze near November 20. And on the energy front, 2,904 heating degree days and 410 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Santa Rosa Sonoma CO scores 82/100 (Excellent), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above are the practical planning tool: mild highs and lows land in the shoulder seasons, August-driven heat peaks in summer, and December-driven cold sets in over deep winter. These are thirty-year averages, not a forecast - any single year can run warmer, wetter, drier, or cooler than the normal.
Frequently Asked Questions
What is the average temperature in Santa Rosa Sonoma CO, CA? ▼
The average annual temperature in Santa Rosa Sonoma CO, California is 58°F. The warmest month averages 84°F (29°C) and the coldest averages 37°F (3°C).
How much rain does Santa Rosa Sonoma CO get? ▼
Santa Rosa Sonoma CO receives 33.8 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Santa Rosa Sonoma CO? ▼
Santa Rosa Sonoma CO has a climate comfort score of 82/100 (Excellent), milder than 83% of U.S. cities in the PlainClimate database.
When is the growing season in Santa Rosa Sonoma CO? ▼
Santa Rosa Sonoma CO has approximately 263 frost-free days per year, with the last spring freeze around March 2 and the first fall freeze around November 20.
How much energy does heating and cooling require in Santa Rosa Sonoma CO? ▼
Santa Rosa Sonoma CO has 2,904 heating degree days and 410 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 Santa Rosa Sonoma CO climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USW00023213 near Santa Rosa Sonoma CO.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USW00023213. 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.