| < December >
|Normal Max/ High Temperature
|Min/ Low Temperature
|Average Daylight per day
|Sun altitude at solar noon on the 21st day.
- The average temperature in Casper, Wy in December is slightly cold at -4.6 °C (23.72 °F).
- Afternoons can be very cool with average high temperatures reaching 1.1 °C (34 °F).
- Overnight temperatures are generally very cold with an average low of -10.2 °C (13.6 °F).
- In December the mean diurnal temperature variation/ range is 11.3 °C (20.3 °F).
- The weather in December is droughty. A paltry 16.8mm (0.7in) of water tumbles.
- The shortest day is 9:00 long and the longest day is 9:13 long with an average length of 9:03.
Check the distance to and compare the Casper, Wy December averages with somewhere beginning with:
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Weather Trend Graph for December in Casper, Wy, Usa
Navigate to December Weather in Locations Surrounding Casper, Wy:
- Crow Agency, Mt, Usa - 308.9 kms (191.9 miles) NNW
- Red Lodge, Mt, Usa - 336.4 kms (209 miles) NW
- Sheridan, Wy, Usa - 209.6 kms (130.2 miles) N
- Lander/ Hunt, Wyoming, Usa - 185.1 kms (115 miles) W
- Pathfinder Dam, Wy, Usa - 110.9 kms (68.9 miles) SSW
- Steamboat Springs, Co, Usa - 272.1 kms (169.1 miles) S
- Rapid City, South Dakota, Usa - 291.3 kms (181 miles) ENE
- Rapid City (Airport), Sd, Usa - 292.9 kms (182 miles) ENE
- Hay Springs, Ne, Usa - 282.2 kms (175.4 miles) E
- Hot Springs, Sd, Usa - 282.2 kms (175.4 miles) E
- Lusk, Wy, Usa - 165.1 kms (102.6 miles) E
- Alliance, Ne, Usa - 315.7 kms (196.2 miles) ESE
- Chugwater, Wy, Usa - 157.7 kms (98 miles) SE
- Scottsbluff, Ne, Usa - 262.8 kms (163.3 miles) ESE
- Laramie, Wy, Usa - 190.1 kms (118.1 miles) SSE
- Cheyenne, Wyoming, Usa - 239.1 kms (148.6 miles) SE
- Kimball, Ne, Usa - 295 kms (183.3 miles) SE
- Fort Collins, Co, Usa - 283.5 kms (176.1 miles) SSE