Richland weather in December: Richland, Washington: normal highs, lows, rain and records for December
Richland in December has a normal high of 40°F and a normal low of 28°F, a daily mean of 34°F, falling from 43°F on the 1st to 39°F by the 31st. Measurable precipitation falls on 12 days in a normal December, 1.07 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 4°C and low of −2°C, 27 mm of precipitation in December.
- NOAA stationRichland
- Station IDUSC00457015
- Location46.31°N 119.26°W
- Elevation373 ft (114 m)
- Population64,372
- Jan 41° 29°
- Feb 48° 30°
- Mar 57° 35°
- Apr 65° 41°
- May 74° 48°
- Jun 80° 54°
- Jul 89° 60°
- Aug 88° 59°
- Sep 79° 51°
- Oct 64° 42°
- Nov 49° 34°
- Dec 40° 28°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Richland in December?
The normal high is 40°F and the normal low 28°F, for a daily mean of 34.1°F. December is 7.2°F cooler than November and 0.6°F cooler than January. December is the 12th warmest month of the year in Richland and the wettest. Across the month the normal high falls 4°F, from 43°F on December 1 to 39°F on December 31. From one year to the next December's mean temperature typically moves about 3.6°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 31°F and 38°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 39%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 43°F | 30°F | 37% | 11% |
| December 8 | 41°F | 29°F | 38% | 12% |
| December 15 | 40°F | 28°F | 38% | 12% |
| December 22 | 39°F | 28°F | 39% | 13% |
| December 31 | 39°F | 28°F | 39% | 14% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 23)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 43°F | 30°F | 37% | 11% | 8 h 50 min |
| December 2 | 43°F | 30°F | 37% | 11% | 8 h 50 min |
| December 3 | 42°F | 30°F | 37% | 11% | 8 h 50 min |
| December 4 | 42°F | 30°F | 38% | 11% | 8 h 50 min |
| December 5 | 42°F | 30°F | 38% | 11% | 8 h 50 min |
| December 6 | 41°F | 29°F | 38% | 11% | 8 h 50 min |
| December 7 | 41°F | 29°F | 38% | 11% | 8 h 50 min |
| December 8 | 41°F | 29°F | 38% | 12% | 8 h 40 min |
| December 9 | 41°F | 29°F | 38% | 12% | 8 h 40 min |
| December 10 | 40°F | 29°F | 38% | 12% | 8 h 40 min |
| December 11 | 40°F | 29°F | 38% | 12% | 8 h 40 min |
| December 12 | 40°F | 29°F | 38% | 12% | 8 h 40 min |
| December 13 | 40°F | 28°F | 38% | 12% | 8 h 40 min |
| December 14 | 40°F | 28°F | 38% | 12% | 8 h 40 min |
| December 15 | 40°F | 28°F | 38% | 12% | 8 h 40 min |
| December 16 | 39°F | 28°F | 38% | 12% | 8 h 40 min |
| December 17 | 39°F | 28°F | 38% | 12% | 8 h 40 min |
| December 18 | 39°F | 28°F | 38% | 12% | 8 h 40 min |
| December 19 | 39°F | 28°F | 38% | 12% | 8 h 40 min |
| December 20 | 39°F | 28°F | 38% | 13% | 8 h 40 min |
| December 21 | 39°F | 28°F | 39% | 13% | 8 h 40 min |
| December 22 | 39°F | 28°F | 39% | 13% | 8 h 40 min |
| December 23 | 39°F | 28°F | 39% | 13% | 8 h 40 min |
| December 24 | 39°F | 28°F | 39% | 13% | 8 h 40 min |
| December 25 | 39°F | 28°F | 39% | 13% | 8 h 40 min |
| December 26 | 39°F | 28°F | 39% | 13% | 8 h 40 min |
| December 27 | 39°F | 28°F | 39% | 13% | 8 h 40 min |
| December 28 | 39°F | 28°F | 39% | 14% | 8 h 40 min |
| December 29 | 39°F | 28°F | 39% | 14% | 8 h 40 min |
| December 30 | 39°F | 28°F | 39% | 14% | 8 h 40 min |
| December 31 | 39°F | 28°F | 39% | 14% | 8 h 40 min |
- Normal high
- 40°FDecember average
- Normal low
- 28°FDecember average
- Precipitation
- 1.07 inmonth total
- Days with precipitation
- 120.01 inch or more
- Nights at 32°F or colder
- 22
- Daylight
- 8 h 50 min to 8 h 40 minDecember 1 to December 31
- Sunshine
- 55%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00457015; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Richland in December?
On a given December day the chance of 0.01 inch or more is 38% on average, highest around December 28 (39%). In all, 1.07 in falls on 12 days of a normal December.
In a normal December in Richland, 22 nights fall to freezing and 7 days stay below freezing all day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00457015.
What are the records for December in Richland?
The warmest December temperature on this station's record (since 1944) is 69°F, on December 1, 2021; the coldest is −10°F, on December 30, 1968. The wettest December brought 2.83 in (1973); the snowiest, 12.7 inches (1964).
The December mean against the 1991-2020 normal of 34.1°F: 2021 36.2°F (+2.1), 2022 25.2°F (−8.9), 2023 37.5°F (+3.4), 2024 37.7°F (+3.6), 2025 42.8°F (+8.7). 4 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 36.2°F | +2.1°F | 1.30 in |
| 2022 | 25.2°F | −8.9°F | 1.39 in |
| 2023 | 37.5°F | +3.4°F | 2.28 in |
| 2024 | 37.7°F | +3.6°F | 2.55 in |
| 2025 | 42.8°F | +8.7°F | 1.67 in |
Source: records: ACIS, station USC00457015; recent months: ACIS, station USC00457015. Records and recent months use complete months only.
How does December in Richland compare across Washington?
Across the 96 places PlainClimate covers in Washington, December normal highs run from 29°F in Winthrop to 48°F in Grayland; Richland's is 40°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.