Clearlake, CA Climate: Temperature & Rain by Month
Temperature and precipitation from NOAA NCEI 1991–2020 normals →, plus PlainClimate's derived comfort score
30-year climate normals (1991-2020) from Clearlake's primary NOAA station, CLEARLAKE 4 SE.
The climate verdict for Clearlake
A compact 29.9°F seasonal swing gives Clearlake, California a steadier-than-extreme annual shape. NOAA reports an annual average of 57°F. It scores 83/100 for climate comfort (excellent), putting it in the top third of station-mapped location scores and exceeding 81% of them.
- 57°F
- average temperature, NOAA 1991-2020 normal
- 83/100
- comfort score, above 81% of station-mapped location scores
- 29.9"
- annual precipitation
- 210 days
- frost-free growing season
Clearlake: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00041806 · Clearlake, CA 57°F mean · 29.9" precip
TEMP-MILD · RANK-UPPER · PHOTO-FINISH · PRCP-MID · SWING-NARROW · COMF-TOP · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-MILD 57°F
- RANK-UPPER #4,528
- PHOTO-FINISH ≈ Cougar Dam
- PRCP-MID 29.9"
- SWING-NARROW 30°F
- COMF-TOP 83/100
- LOAD-HEAT 3,707 HDD
- STN-1 USC00041806
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Cougar Dam, OR (+ 0.4 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every CA station list.
- Clearlake (this station) 57°F
- Cold Portal, AZ 57°F
- Hot Priest Valley, CA 57°F
- Near Cougar Dam, OR 57°F
- Near Sautee, GA 57°F
Climate Living Index · Clearlake
Clearlake: 80/100 · grade B
Clearlake publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Clearlake, not an official NOAA rating. Rankings still use Comfort Score 83/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 48 calendar days | 92/100 · A |
| Snowfall burden | 0.4 inches/year | 87/100 · A |
| Precipitation balance | 29.9 in · 5.1 from 35 in | 82/100 · B |
| Frost-free season | 210 days/year | 71/100 · B |
| Annual temperature balance | 56.9°F · 10.6° from 67.5°F | 66/100 · C |
Clearlake · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Clearlake is a temperate Köppen climate: Csa
Coldest-month mean 43.7°F and warmest-month mean 73.6°F place this station in temperate, dry-summer, hot summer climates (Csa). Class Csa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, dry-summer, hot summer.
- Köppen code
- Csa
- Group
- Temperate
- Warmest month
- 73.6°F
- Coldest month
- 43.7°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Clearlake sits across the climate record
Three NOAA fields for Clearlake's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 66th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 40th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Narrower than 91%
- Warmest-to-coldest month gap for Clearlake is compact versus 6,861 complete station-years.
How Clearlake compares across U.S. station-mapped locations
Clearlake's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
83 Top 19% score exceeds 81% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). Below this entry.
- 70–80: 650 station-mapped locations (11%). Below this entry.
- 80–90: 921 station-mapped locations (15%). This entry sits in this band.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
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 |
The year, day by day
The year in Clearlake runs from a mild 32°F around January 1 to 92°F at the peak near July 23, and the normal low never reaches freezing on any date in the record.
When the heat sits
Normal highs reach 90°F from July 5 through August 21, covering 48 dates. The broader mild season, normal highs of 70°F or more, runs May 7 to October 29.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
No freezing date
Not one calendar date in the 1991–2020 record carries a normal low at or below 32°F. The coldest normal low of the year is 32°F around January 1.
Where the wet dates fall
The likeliest wet date is February 17, when 45% of years recorded at least a hundredth of an inch. The driest is July 27 at 1%. Summed across the calendar, that is about 78 wet dates a year.
The widest day
August 23 carries the biggest normal gap between afternoon and dawn, 36°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Clearlake.
Where Clearlake Stands Nationally
Day-to-night contrast is extreme by national standards — the widest normal daily swing reaches about 36°F, sharper than nine in ten ranked stations see.
Clearlake earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 0.2"
13.6 days with precipitation
Snow: 0.1"
12.7 days with precipitation
Snow: 0.1"
10.3 days with precipitation
8.1 days with precipitation
5.4 days with precipitation
1.7 days with precipitation
0.2 days with precipitation
0.2 days with precipitation
0.6 days with precipitation
4.0 days with precipitation
9.2 days with precipitation
12.6 days with precipitation
Clearlake's wet season runs through the cold months
December, January and February carry 62% of the year's precipitation here, while June through August contribute 1%. That is the cool-season-dominant pattern of the West Coast and the higher inland West, where storm tracks swing south in winter and summer turns dry; the thermometer meanwhile shows an unusually narrow 29.9°F seasonal spread.
- Wettest month
- January, 6.2"
- Driest month
- July, 0.0"
- Wettest three months
- January, February, December (62% of the year)
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A cool-season label means the December-February share reaches 35%. Where snow falls, the monthly figures above report liquid-equivalent precipitation, so a wet winter month is not necessarily a rainy one.
When it rains in Clearlake, it arrives in quantity
29.9" of precipitation falls across only about 79 wet days here, averaging 0.38 inches each. Fewer days carry more water: the year's total is delivered in comparatively heavy events rather than persistent damp.
- Days with measurable precipitation
- about 79 a year, 22% of all days
- Average depth per wet day
- 0.38 inches
- Most wet days
- January, about 14
- Fewest wet days
- July, about 0
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, and a per-day average is not a forecast of any individual storm.
Snow reaches Clearlake, but rarely amounts to much
The normals record 0.4 inches of snow a year here, most likely in January. That is a real but marginal amount: enough that snow is part of the local record, not enough to define the winter.
A figure in this range usually reflects a handful of events that melt quickly rather than a season of accumulation; about 0 days a year record any measurable snow at all.
NOAA 1991-2020 normals. An average across thirty years can smooth away a single heavy winter, so a small annual figure does not mean a significant snowfall is impossible.
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
Nationwide similar cities
Other rankable U.S. places outside CA closest to Clearlake on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (57°F here).
- Ashland, KS 57°F · 0.0°F off
- Beaver Dam, KY 57°F · 0.0°F off
- Benton, KY 57°F · 0.0°F off
- Diamond, MO 57°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (29.9" here), excluding temperature-peer places.
- Hawarden, IA 29.9" · 0.0" off
- Onawa, IA 29.9" · 0.0" off
- Courtland, KS 29.9" · 0.0" off
- Babbitt, MN 29.8" · 0.0" off
Data-derived climate profile
How Clearlake's climate pattern fits together
heating led · moderate · low swing
Heating is the larger measured load in Clearlake, at 3,707 degree days versus 788 for cooling. Unlike a strongly continental record, however, its 29.9°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
Clearlake's frost-free season lasts about 210 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
Temperature varies within a narrow 29.9°F band across the normal year. July and January mark the typical warm and cold ends of the calendar. The annual average is 57°F. Monthly rows still matter, but they refine a steady profile rather than reveal two climatic extremes.
Clearlake's 29.9 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Recorded annual snowfall is negligible. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from Clearlake's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Clearlake, not an official NOAA class or a year-ahead forecast.
Questions about Clearlake's climate
How much rain does Clearlake get? ▼
How many days above 90°F does Clearlake get? ▼
How much energy does heating and cooling require in Clearlake? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Clearlake's primary station: CLEARLAKE 4 SE (USC00041806). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 0613945). Match rule for Clearlake: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Clearlake comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.