Rock Springs December Weather

Averages and records for weather in Rock Springs, Wyoming in the month of December.
Typical Rock Springs December Weather
1991–2020
Average daily high 29.8 °F
Average daily low 12.9 °F
Average monthly precipitation 0.3 inches
Daily chance of precipitation 15.9%
Rock Springs December Weather Records
1898–2024
Highest temperature 59 °F December 4, 1939
Lowest temperature -30 °F December 21, 1899
Highest daily low 42 °F December 10, 1933
Lowest daily high -17 °F December 20, 1990
Hottest average high temperature 43.9 °F 1939
Coldest average high temperature 21.4 °F 1978
Most daily precipitation 0.9 inches December 12, 1975
Most monthly precipitation 1.8 inches 1975
Note: Daily averages are a moving average which includes 14 days before and after
Day Average (°F) Record (°F)
High Low High Low
December 1 34.7 16.5 57 -7
December 2 34.3 16.2 58 -3
December 3 33.8 15.8 54 -4
December 4 33.3 15.4 59 -13
December 5 32.8 15.1 58 -22
December 6 32.5 14.9 57 -19
December 7 32.1 14.6 54 -18
December 8 31.8 14.4 58 -20
December 9 31.5 14.1 58 -21
December 10 31.2 13.9 56 -28
December 11 30.9 13.7 55 -24
December 12 30.7 13.5 51 -12
December 13 30.4 13.3 49 -10
December 14 30.2 13.2 52 -13
December 15 30.0 13.0 51 -16
December 16 29.8 12.9 57 -12
December 17 29.5 12.6 57 -16
December 18 29.3 12.5 51 -22
December 19 29.2 12.4 50 -23
December 20 29.1 12.3 51 -27
December 21 29.0 12.2 51 -30
December 22 28.9 12.1 51 -29
December 23 28.9 12.1 54 -16
December 24 28.8 12.1 50 -16
December 25 28.8 12.1 47 -17
December 26 28.7 12.1 52 -17
December 27 28.7 12.1 51 -23
December 28 28.7 12.0 50 -17
December 29 28.6 12.0 47 -11
December 30 28.5 12.0 52 -22
December 31 28.5 12.1 53 -29
Weather Station Details
Years Station Coordinates
1948–2024 Rock Springs Airport location
1898–1947 Rock Springs location