Climate Comfort Score
83/100
Excellent
NOAA 1991–2020 normals 57°F annual avg Public-domain federal data
Clearlake, CA Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991–2020 normals →
- 57°F
- Avg annual temp
- 83/100
- Comfort score
- 29.9"
- Annual precip
- 210d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Clearlake
Clearlake, California averages 57°F a year and scores 83/100 on the comfort index - excellent, milder than 85% of U.S. cities.
- 57°F
- average temperature, NOAA 1991-2020 normal
- 83/100
- comfort score, milder than 85% of U.S. cities
- 29.9"
- annual precipitation
- 210 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
57°F (14°C)
Avg High
71°F
Avg Low
42°F
Annual Precip
29.9"
Annual Snow
0.4"
Comfort Score
83/100
Excellent
Avg Annual Temperature
57°F
30-year mean (NOAA NCEI)
Annual Precipitation
29.9"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Clearlake) 83.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Clearlake area.
How Clearlake compares to every U.S. city
Clearlake's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
83 Top 15% higher than 85% 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 Clearlake
MethodologyHow the U.S. land temperature anomaly tracks against the global mean since 1900. The current NOAA 1991-2020 normal for Clearlake 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 | 55°F (13°C) | 33°F (0°C) | 44°F (7°C) | 6.2" | 0.2" | 17.7 | 0.0 |
| February | 58°F (14°C) | 34°F (1°C) | 46°F (8°C) | 6.2" | 0.1" | 12.8 | 0.0 |
| March | 62°F (16°C) | 35°F (2°C) | 49°F (9°C) | 4.0" | 0.1" | 9.1 | 0.0 |
| April | 66°F (19°C) | 39°F (4°C) | 53°F (12°C) | 2.0" | 0.0" | 3.3 | 0.0 |
| May | 73°F (23°C) | 45°F (7°C) | 59°F (15°C) | 1.2" | 0.0" | 0.1 | 2.0 |
| June | 83°F (28°C) | 52°F (11°C) | 67°F (20°C) | 0.2" | 0.0" | 0.0 | 8.9 |
| July | 91°F (33°C) | 56°F (13°C) | 74°F (23°C) | 0.0" | 0.0" | 0.0 | 21.7 |
| August | 91°F (33°C) | 54°F (12°C) | 72°F (22°C) | 0.1" | 0.0" | 0.0 | 17.9 |
| September | 85°F (30°C) | 50°F (10°C) | 68°F (20°C) | 0.2" | 0.0" | 0.0 | 13.4 |
| October | 75°F (24°C) | 43°F (6°C) | 59°F (15°C) | 0.9" | 0.0" | 0.9 | 2.0 |
| November | 63°F (17°C) | 36°F (2°C) | 50°F (10°C) | 2.9" | 0.0" | 10.8 | 0.0 |
| December | 55°F (13°C) | 33°F (0°C) | 44°F (7°C) | 6.1" | 0.0" | 17.5 | 0.0 |
Monthly Precipitation
Average monthly rainfall and snowfall
January 6.2"
Snow: 0.2"
13.6 days with precipitation
February 6.2"
Snow: 0.1"
12.7 days with precipitation
March 4.0"
Snow: 0.1"
10.3 days with precipitation
April 2.0"
8.1 days with precipitation
May 1.2"
5.4 days with precipitation
June 0.2"
1.7 days with precipitation
July 0.0"
0.2 days with precipitation
August 0.1"
0.2 days with precipitation
September 0.2"
0.6 days with precipitation
October 0.9"
4.0 days with precipitation
November 2.9"
9.2 days with precipitation
December 6.1"
12.6 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
November 6
50% probability date
Last Spring Freeze
April 10
50% probability date
Growing Season
210 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
3,707
Higher = more heating needed
Cooling Degree Days
788
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
What Clearlake's climate means for you
Clearlake runs 57°F a year - peaking in July, coldest in January.
- Gardeners get about 210 frost-free days, with the last spring freeze near April 10 - plan the planting calendar around it, not the regional average.
- Energy bills track 3,707 heating and 788 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: Clearlake, CA
Clearlake, California runs an annual average of 57°F, ranging from a mean daily high of 71°F to a mean daily low of 42°F, per NOAA's 1991–2020 climate normals. July is typically the warmest month of the year, while January is the coldest. Drawn from station USC00041806, these thirty-year averages smooth out year-to-year swings into a baseline for what a typical month looks like here.
Rainfall (and snow, where it falls) shapes day-to-day life here as much as temperature does. Clearlake sees about 29.9 inches of precipitation a year, with negligible snowfall. The frost-free season averages 210 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 10 and the first fall freeze near November 6. On the energy side, 3,707 heating degree days and 788 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Clearlake scores 83/100 (Excellent), 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 July-driven heat, and winter brings January-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 Clearlake, CA? ▼
The average annual temperature in Clearlake, California is 57°F. The warmest month averages 91°F (33°C) and the coldest averages 33°F (0°C).
How much rain does Clearlake get? ▼
Clearlake receives 29.9 inches of precipitation annually, including 0.4 inches of snow. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Clearlake? ▼
Clearlake has a climate comfort score of 83/100 (Excellent), milder than 85% of U.S. cities in the PlainClimate database.
When is the growing season in Clearlake? ▼
Clearlake has approximately 210 frost-free days per year, with the last spring freeze around April 10 and the first fall freeze around November 6.
How much energy does heating and cooling require in Clearlake? ▼
Clearlake has 3,707 heating degree days and 788 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 Clearlake climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00041806 near Clearlake.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00041806. 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.