Clearlake weather in December: Clearlake, California: normal highs, lows, rain and records for December
Clearlake in December has a normal high of 55°F and a normal low of 33°F, a daily mean of 44°F, falling from 58°F on the 1st to 54°F by the 31st. Measurable precipitation falls on 13 days in a normal December, 6.08 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 13°C and low of 0°C, 154 mm of precipitation in December.
- NOAA stationClearlake (4 mi SE)
- Station IDUSC00041806
- Location38.92°N 122.57°W
- Elevation1,349 ft (411 m)
- From the center4 miles
- Population16,636
- Jan 55° 33°
- Feb 58° 34°
- Mar 62° 35°
- Apr 66° 39°
- May 73° 45°
- Jun 83° 52°
- Jul 91° 56°
- Aug 91° 54°
- Sep 85° 50°
- Oct 75° 43°
- Nov 63° 36°
- Dec 55° 33°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Clearlake in December?
The normal high is 55°F and the normal low 33°F, for a daily mean of 43.7°F. December is 5.8°F cooler than November and 0.0°F cooler than January. December is the 11th warmest month of the year in Clearlake and the 3rd wettest. Across the month the normal high falls 4°F, from 58°F on December 1 to 54°F on December 31. From one year to the next December's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 42°F and 46°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 43%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 58°F | 33°F | 37% | 24% |
| December 8 | 56°F | 33°F | 39% | 27% |
| December 15 | 55°F | 33°F | 40% | 28% |
| December 22 | 54°F | 32°F | 41% | 29% |
| December 31 | 54°F | 32°F | 43% | 30% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 25)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 58°F | 33°F | 37% | 24% | 9 h 40 min |
| December 2 | 57°F | 33°F | 37% | 25% | 9 h 40 min |
| December 3 | 57°F | 33°F | 37% | 25% | 9 h 40 min |
| December 4 | 57°F | 33°F | 38% | 25% | 9 h 40 min |
| December 5 | 57°F | 33°F | 38% | 26% | 9 h 40 min |
| December 6 | 56°F | 33°F | 38% | 26% | 9 h 30 min |
| December 7 | 56°F | 33°F | 38% | 26% | 9 h 30 min |
| December 8 | 56°F | 33°F | 39% | 27% | 9 h 30 min |
| December 9 | 56°F | 33°F | 39% | 27% | 9 h 30 min |
| December 10 | 55°F | 33°F | 39% | 27% | 9 h 30 min |
| December 11 | 55°F | 33°F | 39% | 27% | 9 h 30 min |
| December 12 | 55°F | 33°F | 39% | 27% | 9 h 30 min |
| December 13 | 55°F | 33°F | 40% | 28% | 9 h 30 min |
| December 14 | 55°F | 33°F | 40% | 28% | 9 h 30 min |
| December 15 | 55°F | 33°F | 40% | 28% | 9 h 30 min |
| December 16 | 54°F | 33°F | 40% | 28% | 9 h 30 min |
| December 17 | 54°F | 32°F | 40% | 28% | 9 h 30 min |
| December 18 | 54°F | 32°F | 40% | 28% | 9 h 30 min |
| December 19 | 54°F | 32°F | 40% | 28% | 9 h 30 min |
| December 20 | 54°F | 32°F | 41% | 28% | 9 h 30 min |
| December 21 | 54°F | 32°F | 41% | 29% | 9 h 30 min |
| December 22 | 54°F | 32°F | 41% | 29% | 9 h 30 min |
| December 23 | 54°F | 32°F | 41% | 29% | 9 h 30 min |
| December 24 | 54°F | 32°F | 41% | 29% | 9 h 30 min |
| December 25 | 54°F | 32°F | 42% | 29% | 9 h 30 min |
| December 26 | 54°F | 32°F | 42% | 29% | 9 h 30 min |
| December 27 | 54°F | 32°F | 42% | 29% | 9 h 30 min |
| December 28 | 54°F | 32°F | 42% | 30% | 9 h 30 min |
| December 29 | 54°F | 32°F | 42% | 30% | 9 h 30 min |
| December 30 | 54°F | 32°F | 43% | 30% | 9 h 30 min |
| December 31 | 54°F | 32°F | 43% | 30% | 9 h 30 min |
- Normal high
- 55°FDecember average
- Normal low
- 33°FDecember average
- Precipitation
- 6.08 inmonth total
- Days with precipitation
- 130.01 inch or more
- Nights at 32°F or colder
- 18
- Daylight
- 9 h 40 min to 9 h 30 minDecember 1 to December 31
- Days at 70°F or more
- 1
- Sunshine
- 72%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00041806; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Clearlake in December?
On a given December day the chance of 0.01 inch or more is 40% on average, highest around December 31 (43%). In all, 6.08 in falls on 13 days of a normal December, 2 of them with an inch or more.
In a normal December in Clearlake, 18 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00041806.
What are the records for December in Clearlake?
The warmest December temperature on this station's record (since 1954) is 78°F, on December 28, 1967; the coldest is 6°F, on December 22, 1990. The wettest December brought 17.88 in (2002); the snowiest, 2.5 inches (1972).
The December mean against the 1991-2020 normal of 43.7°F: 2024 47.5°F (+3.8), 2025 50.0°F (+6.3). 2 of 2 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2024 | 47.5°F | +3.8°F | 4.23 in |
| 2025 | 50.0°F | +6.3°F | 6.71 in |
Source: records: ACIS, station USC00041806; recent months: ACIS, station USC00041806. Records and recent months use complete months only.
How does December in Clearlake compare across California?
Across the 219 places PlainClimate covers in California, December normal highs run from 38°F in Tahoma to 71°F in Anaheim; Clearlake's is 55°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Clearlake in November63°F by day, 36°F at night
- Clearlake in January55°F by day, 33°F at night
- Clearlake through the yearEvery month, frost dates, records and recent years
- California in DecemberThe statewide normal and the warmest and coolest places
- Anaheim: California's warmest Decembernormal high 71°F