Ukiah weather in December: Ukiah, California: normal highs, lows, rain and records for December
Ukiah in December has a normal high of 57°F and a normal low of 36°F, a daily mean of 46°F, holding near 57°F all month. Measurable precipitation falls on 15 days in a normal December, 6.92 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 14°C and low of 2°C, 176 mm of precipitation in December.
- NOAA stationUkiah Municipal Airport
- Station IDUSW00023275
- Location39.13°N 123.20°W
- Elevation601 ft (183 m)
- Population16,067
- Jan 58° 37°
- Feb 61° 39°
- Mar 65° 41°
- Apr 69° 43°
- May 78° 48°
- Jun 86° 52°
- Jul 94° 56°
- Aug 94° 55°
- Sep 89° 51°
- Oct 79° 45°
- Nov 65° 40°
- Dec 57° 36°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Ukiah in December?
The normal high is 57°F and the normal low 36°F, for a daily mean of 46.3°F. December is 6.0°F cooler than November and 1.4°F cooler than January. December is the 12th warmest month of the year in Ukiah and the wettest. Across the month the normal high falls 1°F, from 58°F on December 1 to 57°F on December 31. From one year to the next December's mean temperature typically moves about 2.3°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 44°F and 49°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 49%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 58°F | 37°F | 44% | 28% |
| December 8 | 57°F | 36°F | 46% | 31% |
| December 15 | 56°F | 36°F | 48% | 33% |
| December 22 | 56°F | 36°F | 49% | 34% |
| December 31 | 57°F | 36°F | 48% | 33% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 17)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 58°F | 37°F | 44% | 28% | 9 h 40 min |
| December 2 | 58°F | 37°F | 44% | 29% | 9 h 40 min |
| December 3 | 58°F | 37°F | 45% | 29% | 9 h 40 min |
| December 4 | 57°F | 37°F | 45% | 29% | 9 h 40 min |
| December 5 | 57°F | 37°F | 45% | 30% | 9 h 30 min |
| December 6 | 57°F | 36°F | 46% | 30% | 9 h 30 min |
| December 7 | 57°F | 36°F | 46% | 31% | 9 h 30 min |
| December 8 | 57°F | 36°F | 46% | 31% | 9 h 30 min |
| December 9 | 57°F | 36°F | 46% | 31% | 9 h 30 min |
| December 10 | 56°F | 36°F | 47% | 32% | 9 h 30 min |
| December 11 | 56°F | 36°F | 47% | 32% | 9 h 30 min |
| December 12 | 56°F | 36°F | 47% | 32% | 9 h 30 min |
| December 13 | 56°F | 36°F | 48% | 33% | 9 h 30 min |
| December 14 | 56°F | 36°F | 48% | 33% | 9 h 30 min |
| December 15 | 56°F | 36°F | 48% | 33% | 9 h 30 min |
| December 16 | 56°F | 36°F | 48% | 34% | 9 h 30 min |
| December 17 | 56°F | 36°F | 49% | 34% | 9 h 30 min |
| December 18 | 56°F | 36°F | 49% | 34% | 9 h 30 min |
| December 19 | 56°F | 36°F | 49% | 34% | 9 h 30 min |
| December 20 | 56°F | 36°F | 49% | 34% | 9 h 30 min |
| December 21 | 56°F | 36°F | 49% | 34% | 9 h 20 min |
| December 22 | 56°F | 36°F | 49% | 34% | 9 h 20 min |
| December 23 | 56°F | 36°F | 49% | 34% | 9 h 20 min |
| December 24 | 56°F | 36°F | 49% | 34% | 9 h 20 min |
| December 25 | 57°F | 36°F | 49% | 34% | 9 h 30 min |
| December 26 | 57°F | 36°F | 49% | 34% | 9 h 30 min |
| December 27 | 57°F | 36°F | 49% | 33% | 9 h 30 min |
| December 28 | 57°F | 36°F | 48% | 33% | 9 h 30 min |
| December 29 | 57°F | 36°F | 48% | 33% | 9 h 30 min |
| December 30 | 57°F | 36°F | 48% | 33% | 9 h 30 min |
| December 31 | 57°F | 36°F | 48% | 33% | 9 h 30 min |
- Normal high
- 57°FDecember average
- Normal low
- 36°FDecember average
- Precipitation
- 6.92 inmonth total
- Days with precipitation
- 150.01 inch or more
- Nights at 32°F or colder
- 11
- Daylight
- 9 h 40 min to 9 h 30 minDecember 1 to December 31
- Sunshine
- 68%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023275; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Ukiah in December?
On a given December day the chance of 0.01 inch or more is 47% on average, highest around December 21 (49%). In all, 6.92 in falls on 15 days of a normal December, 3 of them with an inch or more.
In a normal December in Ukiah, 11 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023275.
How humid and windy is Ukiah in December?
At 3 p.m. the normal temperature is 54°F with 58% relative humidity and a dew point of 39°F; at 6 a.m. it is 38°F with 90% humidity. The wind averages 2.5 mph, most often from the west-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 38°F | 36°F | 90% | 1.8 mph | – |
| 9 a.m. | 40°F | 37°F | 90% | 2.0 mph | – |
| noon | 49°F | 39°F | 69% | 3.1 mph | – |
| 3 p.m. | 54°F | 39°F | 58% | 4.2 mph | – |
| 6 p.m. | 48°F | 40°F | 74% | 2.7 mph | – |
| 9 p.m. | 43°F | 39°F | 84% | 2.1 mph | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00023275. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for December in Ukiah?
The warmest December temperature on Ukiah's official record (since 1893) is 84°F, on December 3, 2006; the coldest is 13°F, on December 12, 1932. The wettest December brought 21.05 in (1964).
The December mean against the 1991-2020 normal of 46.3°F: 2021 46.0°F (−0.3), 2022 46.4°F (+0.1), 2023 50.3°F (+4.0), 2024 51.2°F (+4.9), 2025 50.6°F (+4.3). 4 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 46.0°F | −0.3°F | 6.25 in |
| 2022 | 46.4°F | +0.1°F | 9.98 in |
| 2023 | 50.3°F | +4.0°F | 7.86 in |
| 2024 | 51.2°F | +4.9°F | 8.88 in |
| 2025 | 50.6°F | +4.3°F | 9.81 in |
Source: records: ACIS, NWS threaded record UKIthr; recent months: ACIS, station USW00023275. Records and recent months use complete months only.
How does December in Ukiah 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; Ukiah's is 57°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.