Climate Comfort Score
87/100
Excellent
NOAA 1991–2020 normals 59°F annual avg Public-domain federal data
Santa Rosa, CA Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991–2020 normals →
- 59°F
- Avg annual temp
- 87/100
- Comfort score
- 31.5"
- Annual precip
- 279d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Santa Rosa
Santa Rosa, California averages 59°F a year and scores 87/100 on the comfort index - excellent, milder than 89% of U.S. cities.
- 59°F
- yearly average temperature, NOAA normal
- 87/100
- comfort score, milder than 89% of U.S. cities
- 31.5"
- annual precipitation
- 279 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
59°F (15°C)
Avg High
72°F
Avg Low
46°F
Annual Precip
31.5"
Annual Snow
0.0"
Comfort Score
87/100
Excellent
Avg Annual Temperature
59°F
30-year mean (NOAA NCEI)
Annual Precipitation
31.5"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Santa Rosa) 87.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Santa Rosa area.
How Santa Rosa compares to every U.S. city
Santa Rosa'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 Santa Rosa
MethodologyZooming out from Santa Rosa'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 | 60°F (15°C) | 38°F (4°C) | 49°F (10°C) | 5.8" | 0.0" | 4.3 | 0.0 |
| February | 64°F (18°C) | 40°F (4°C) | 52°F (11°C) | 6.4" | 0.0" | 2.5 | 0.0 |
| March | 67°F (19°C) | 42°F (5°C) | 54°F (12°C) | 4.3" | 0.0" | 0.5 | 0.0 |
| April | 71°F (21°C) | 44°F (7°C) | 57°F (14°C) | 2.0" | 0.0" | 0.0 | 0.4 |
| May | 75°F (24°C) | 48°F (9°C) | 61°F (16°C) | 1.3" | 0.0" | 0.0 | 0.7 |
| June | 80°F (27°C) | 51°F (11°C) | 66°F (19°C) | 0.3" | 0.0" | 0.0 | 4.5 |
| July | 82°F (28°C) | 52°F (11°C) | 67°F (19°C) | 0.0" | 0.0" | 0.0 | 4.0 |
| August | 83°F (28°C) | 53°F (11°C) | 68°F (20°C) | 0.0" | 0.0" | 0.0 | 6.1 |
| September | 84°F (29°C) | 51°F (11°C) | 68°F (20°C) | 0.1" | 0.0" | 0.0 | 7.3 |
| October | 79°F (26°C) | 48°F (9°C) | 63°F (17°C) | 1.6" | 0.0" | 0.0 | 2.7 |
| November | 67°F (19°C) | 42°F (6°C) | 55°F (13°C) | 3.3" | 0.0" | 2.0 | 0.0 |
| December | 59°F (15°C) | 38°F (3°C) | 49°F (9°C) | 6.5" | 0.0" | 5.5 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 5.8"
14.2 days with precipitation
February 6.4"
12.7 days with precipitation
March 4.3"
12.2 days with precipitation
April 2.0"
7.8 days with precipitation
May 1.3"
5.2 days with precipitation
June 0.3"
1.3 days with precipitation
July 0.0"
0.3 days with precipitation
August 0.0"
0.4 days with precipitation
September 0.1"
1.3 days with precipitation
October 1.6"
3.7 days with precipitation
November 3.3"
9.2 days with precipitation
December 6.5"
13.1 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
December 1
50% probability date
Last Spring Freeze
February 25
50% probability date
Growing Season
279 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
2,627
Higher = more heating needed
Cooling Degree Days
442
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
What Santa Rosa's climate means for you
Santa Rosa runs 59°F a year - peaking in August, coldest in December.
- Gardeners get about 279 frost-free days, with the last spring freeze near February 25 - plan the planting calendar around it, not the regional average.
- Energy bills track 2,627 heating and 442 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, CA
Santa Rosa, California runs an annual average of 59°F, ranging from a mean daily high of 72°F to a mean daily low of 46°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 USC00047965, these thirty-year averages smooth out year-to-year swings into a baseline for what a typical month looks like here.
Precipitation patterns matter as much as temperature for anyone planning to live, garden, or travel here. Santa Rosa receives roughly 31.5 inches of precipitation each year, with negligible snowfall. The frost-free season averages 279 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near February 25 and the first fall freeze near December 1. For energy use, 2,627 heating degree days and 442 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 scores 87/100 (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 August-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 Santa Rosa, CA? ▼
The average annual temperature in Santa Rosa, California is 59°F. The warmest month averages 84°F (29°C) and the coldest averages 38°F (3°C).
How much rain does Santa Rosa get? ▼
Santa Rosa receives 31.5 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Santa Rosa? ▼
Santa Rosa 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 Santa Rosa? ▼
Santa Rosa has approximately 279 frost-free days per year, with the last spring freeze around February 25 and the first fall freeze around December 1.
How much energy does heating and cooling require in Santa Rosa? ▼
Santa Rosa has 2,627 heating degree days and 442 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 climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00047965 near Santa Rosa.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00047965. 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.