Gillette weather in December: Gillette, Wyoming: normal highs, lows, rain and records for December
Gillette in December has a normal high of 36°F and a normal low of 15°F, a daily mean of 25°F, falling from 39°F on the 1st to 36°F by the 31st. Measurable precipitation falls on 7 days in a normal December, 0.36 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 2°C and low of −10°C, 9 mm of precipitation in December.
- NOAA stationGillette Campbell Airport
- Station IDUSW00094023
- Location44.34°N 105.54°W
- Elevation4,354 ft (1,327 m)
- Population33,846
- Jan 36° 14°
- Feb 37° 15°
- Mar 48° 23°
- Apr 55° 30°
- May 65° 39°
- Jun 77° 48°
- Jul 87° 56°
- Aug 86° 54°
- Sep 75° 44°
- Oct 59° 32°
- Nov 46° 22°
- Dec 36° 15°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Gillette in December?
The normal high is 36°F and the normal low 15°F, for a daily mean of 25.4°F. December is 8.2°F cooler than November and 0.2°F warmer than January. December is the 11th warmest month of the year in Gillette and the 11th wettest. Across the month the normal high falls 3°F, from 39°F on December 1 to 36°F on December 31. From one year to the next December's mean temperature typically moves about 4.8°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 21°F and 30°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 23%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 39°F | 17°F | 19% | 5% |
| December 8 | 37°F | 15°F | 20% | 4% |
| December 15 | 36°F | 14°F | 21% | 4% |
| December 22 | 35°F | 14°F | 22% | 3% |
| December 31 | 36°F | 14°F | 23% | 3% |
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 | 39°F | 17°F | 19% | 5% | 9 h 10 min |
| December 2 | 39°F | 17°F | 19% | 4% | 9 h 10 min |
| December 3 | 38°F | 16°F | 19% | 4% | 9 h |
| December 4 | 38°F | 16°F | 19% | 4% | 9 h |
| December 5 | 38°F | 16°F | 20% | 4% | 9 h |
| December 6 | 37°F | 16°F | 20% | 4% | 9 h |
| December 7 | 37°F | 16°F | 20% | 4% | 9 h |
| December 8 | 37°F | 15°F | 20% | 4% | 9 h |
| December 9 | 37°F | 15°F | 20% | 4% | 9 h |
| December 10 | 36°F | 15°F | 20% | 4% | 9 h |
| December 11 | 36°F | 15°F | 20% | 4% | 9 h |
| December 12 | 36°F | 15°F | 20% | 4% | 8 h 50 min |
| December 13 | 36°F | 15°F | 20% | 4% | 8 h 50 min |
| December 14 | 36°F | 14°F | 21% | 4% | 8 h 50 min |
| December 15 | 36°F | 14°F | 21% | 4% | 8 h 50 min |
| December 16 | 36°F | 14°F | 21% | 3% | 8 h 50 min |
| December 17 | 35°F | 14°F | 21% | 3% | 8 h 50 min |
| December 18 | 35°F | 14°F | 21% | 3% | 8 h 50 min |
| December 19 | 35°F | 14°F | 21% | 3% | 8 h 50 min |
| December 20 | 35°F | 14°F | 21% | 3% | 8 h 50 min |
| December 21 | 35°F | 14°F | 22% | 3% | 8 h 50 min |
| December 22 | 35°F | 14°F | 22% | 3% | 8 h 50 min |
| December 23 | 35°F | 14°F | 22% | 3% | 8 h 50 min |
| December 24 | 35°F | 14°F | 22% | 3% | 8 h 50 min |
| December 25 | 36°F | 14°F | 22% | 3% | 8 h 50 min |
| December 26 | 36°F | 14°F | 23% | 3% | 8 h 50 min |
| December 27 | 36°F | 14°F | 23% | 3% | 8 h 50 min |
| December 28 | 36°F | 14°F | 23% | 3% | 8 h 50 min |
| December 29 | 36°F | 14°F | 23% | 3% | 8 h 50 min |
| December 30 | 36°F | 14°F | 23% | 3% | 8 h 50 min |
| December 31 | 36°F | 14°F | 23% | 3% | 8 h 50 min |
- Normal high
- 36°FDecember average
- Normal low
- 15°FDecember average
- Precipitation
- 0.36 inmonth total
- Days with precipitation
- 70.01 inch or more
- Nights at 32°F or colder
- 30
- Daylight
- 9 h 10 min to 8 h 50 minDecember 1 to December 31
- Sunshine
- 68%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094023; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Gillette in December?
On a given December day the chance of 0.01 inch or more is 21% on average, highest around December 31 (23%). In all, 0.36 in falls on 7 days of a normal December.
In a normal December in Gillette, 30 nights fall to freezing and 11 days stay below freezing all day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094023.
How humid and windy is Gillette in December?
At 3 p.m. the normal temperature is 31°F with 54% relative humidity and a dew point of 16°F; at 6 a.m. it is 21°F with 67% humidity. The wind averages 11.0 mph, most often from the west in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 21°F | 12°F | 67% | 10.5 mph | 67% |
| 9 a.m. | 23°F | 13°F | 64% | 10.9 mph | – |
| noon | 30°F | 16°F | 55% | 12.5 mph | 68% |
| 3 p.m. | 31°F | 16°F | 54% | 11.4 mph | – |
| 6 p.m. | 24°F | 14°F | 66% | 10.1 mph | 67% |
| 9 p.m. | 22°F | 13°F | 67% | 10.6 mph | 67% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094023. 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 Gillette?
The December mean against the 1991-2020 normal of 25.4°F: 2021 27.5°F (+2.1), 2022 20.8°F (−4.6), 2023 33.5°F (+8.1), 2024 33.5°F (+8.1), 2025 33.1°F (+7.7). 4 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 27.5°F | +2.1°F | 0.78 in |
| 2022 | 20.8°F | −4.6°F | 0.58 in |
| 2023 | 33.5°F | +8.1°F | 0.19 in |
| 2024 | 33.5°F | +8.1°F | 0.33 in |
| 2025 | 33.1°F | +7.7°F | 0.67 in |
Source: recent months: ACIS, station USW00094023. Records and recent months use complete months only.
How does December in Gillette compare across Wyoming?
Across the 71 places PlainClimate covers in Wyoming, December normal highs run from 24°F in Bondurant to 43°F in Yoder; Gillette's is 36°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.