Idaho Falls December Weather

Averages and records for weather in Idaho Falls, Idaho in the month of December.
Typical Idaho Falls December Weather
1991–2020
Average daily high 30.5 °F
Average daily low 13.4 °F
Average monthly precipitation 0.7 inches
Daily chance of precipitation 30.6%
Idaho Falls December Weather Records
1948–2024
Highest temperature 58 °F December 12, 2014
Lowest temperature -31 °F December 5, 1972
Highest daily low 41 °F December 22, 1955
Lowest daily high -12 °F December 10, 1972
Hottest average high temperature 38.1 °F 1958
Coldest average high temperature 18.5 °F 1985
Most daily precipitation 0.7 inches December 23, 1982
Most monthly precipitation 2.0 inches 1983
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 35.8 17.3 54 -2
December 2 35.3 16.9 54 -1
December 3 34.8 16.5 56 -15
December 4 34.3 16.1 54 -19
December 5 33.8 15.9 51 -31
December 6 33.4 15.7 55 -16
December 7 33.1 15.4 48 -14
December 8 32.7 15.3 48 -20
December 9 32.3 15.1 57 -29
December 10 32.1 14.8 52 -30
December 11 31.7 14.6 58 -26
December 12 31.4 14.3 58 -14
December 13 31.2 14.0 46 -14
December 14 31.0 13.8 51 -13
December 15 30.8 13.7 46 -14
December 16 30.6 13.5 50 -14
December 17 30.2 13.2 48 -21
December 18 29.9 12.9 46 -14
December 19 29.7 12.7 48 -13
December 20 29.4 12.5 44 -19
December 21 29.3 12.4 50 -24
December 22 29.1 12.2 51 -25
December 23 28.9 12.0 51 -30
December 24 28.7 11.9 47 -18
December 25 28.7 11.8 46 -15
December 26 28.6 11.9 53 -15
December 27 28.5 11.7 53 -17
December 28 28.5 11.8 46 -13
December 29 28.4 11.6 49 -18
December 30 28.3 11.6 52 -24
December 31 28.3 11.7 48 -29
Weather Station Details
Years Station Coordinates
1948–2024 Idaho Falls Fanning Field location