Climate averages 1991–2020
Wyoming weather
in December.
A cold month with moderate precipitation: the 10th warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Wyoming: daytime highs average 1.9°C and nights cool to about -3.8°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 60 mm of precipitation on roughly 11 days, which makes December a month with moderate precipitation (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 05 min on an average December day.
The nearest other city in this atlas is Grand Rapids (6 km away). In December its highs average 1.7°C, about as warm as Wyoming, with 60 mm of precipitation.
Among the 498 cities listed in the United States, Wyoming ranks joint 453rd of 498 for the warmest December highs and joint 215th of 498 for the driest December (precipitation, lowest first). The mean December high of those 498 cities is 10.5°C; Wyoming is 8.7°C cooler than that mean.
From December to January, average highs fall by 2.9°C to -1.1°C, and monthly precipitation rises from 60 mm to 62 mm.
The annual picture
December in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Wyoming climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -1.1°C-8.1°C | -8.1°C | 62 | 10.5 | 9.49 h |
| February | 0.3°C-8.2°C | -8.2°C | 50 | 8.1 | 10.511 h |
| March | 6.2°C-3.3°C | -3.3°C | 63 | 9.3 | 11.912 h |
| April | 13.2°C3.0°C | 3.0°C | 101 | 12.1 | 13.413 h |
| May | 19.5°C9.6°C | 9.6°C | 108 | 11.9 | 14.615 h |
| June | 24.7°C15.3°C | 15.3°C | 95 | 11.3 | 15.315 h |
| July | 26.7°C17.8°C | 17.8°C | 96 | 10.8 | 15.015 h |
| August | 25.8°C17.3°C | 17.3°C | 92 | 10.5 | 13.914 h |
| September | 22.1°C13.5°C | 13.5°C | 79 | 9.3 | 12.513 h |
| October | 15.0°C7.4°C | 7.4°C | 86 | 11.4 | 11.111 h |
| November | 7.7°C1.3°C | 1.3°C | 68 | 10.0 | 9.810 h |
| December, selected | 1.9°C-3.8°C | -3.8°C | 60 | 10.8 | 9.19 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Grand Rapids in DecemberUnited States · 6 kmHigh 1.7°C · Low -3.8°C · 60 mm precipitation
- Kalamazoo in DecemberUnited States · 70 kmHigh 2.0°C · Low -3.8°C · 63 mm rain
- Lansing in DecemberUnited States · 96 kmHigh 1.8°C · Low -4.4°C · 56 mm precipitation
- South Bend in DecemberUnited States · 144 kmHigh 2.6°C · Low -3.7°C · 61 mm rain
- Flint in DecemberUnited States · 165 kmHigh 1.6°C · Low -4.5°C · 54 mm precipitation
- Racine in DecemberUnited States · 171 kmHigh 1.6°C · Low -2.6°C · 68 mm precipitation
- Ann Arbor in DecemberUnited States · 176 kmHigh 2.0°C · Low -4.3°C · 57 mm rain
- Kenosha in DecemberUnited States · 177 kmHigh 1.8°C · Low -2.4°C · 71 mm precipitation
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Wyoming) is explained once on the Wyoming year overview and on the Sources, method and limits page.
Grand Rapids lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.