American Falls Weather in December
Average highs run from 37°F on December 1 to 31°F on December 31, and lows from 20°F to 17°F. Normal precipitation for the month is 1.21 in over about 10 wet days.
December day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
December at a glance
- Average high
- 33°F
- Average low
- 18°F
- Precipitation
- 1.21 in
- Snowfall
- 7.9 in
- Record high
- 64°FDec 1, 1995
- Record low
- -29°FDec 23, 1990
- Chance of a freeze
- 100%
- Daylight
- 9 h 16 min to 9 h 05 min
- Cloud cover
- 70%
- Humidity
- 82%
- Dew point
- 19°F
- Wind
- 8.3 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Dec 1 | 37°F | 20°F | 64°F 1995 | -3°F 1967 | 29% | 17% |
| Dec 2 | 37°F | 20°F | 61°F 2021 | -1°F 2015 | 29% | 17% |
| Dec 3 | 36°F | 20°F | 58°F 1987 | -17°F 1992 | 30% | 18% |
| Dec 4 | 36°F | 20°F | 57°F 1946 | -22°F 1992 | 30% | 18% |
| Dec 5 | 35°F | 19°F | 57°F 1939 | -25°F 1972 | 30% | 18% |
| Dec 6 | 35°F | 19°F | 57°F 1981 | -12°F 1972 | 30% | 18% |
| Dec 7 | 35°F | 19°F | 54°F 1981 | -9°F 2005 | 30% | 18% |
| Dec 8 | 34°F | 19°F | 59°F 1939 | -14°F 1972 | 30% | 19% |
| Dec 9 | 34°F | 19°F | 60°F 1939 | -24°F 1972 | 31% | 19% |
| Dec 10 | 34°F | 18°F | 63°F 1939 | -28°F 1972 | 31% | 19% |
| Dec 11 | 33°F | 18°F | 60°F 1939 | -26°F 1972 | 31% | 19% |
| Dec 12 | 33°F | 18°F | 59°F 2014 | -11°F 1985 | 31% | 20% |
| Dec 13 | 33°F | 18°F | 57°F 2025 | -12°F 1967 | 31% | 20% |
| Dec 14 | 33°F | 18°F | 54°F 2002 | -15°F 1972 | 31% | 20% |
| Dec 15 | 32°F | 18°F | 55°F 1946 | -16°F 1972 | 31% | 20% |
| Dec 16 | 32°F | 17°F | 62°F 1939 | -8°F 1985 | 31% | 20% |
| Dec 17 | 32°F | 17°F | 55°F 1939 | -15°F 1964 | 31% | 21% |
| Dec 18 | 32°F | 17°F | 54°F 1958 | -13°F 1964 | 31% | 21% |
| Dec 19 | 32°F | 17°F | 55°F 1941 | -15°F 1945 | 31% | 21% |
| Dec 20 | 32°F | 17°F | 56°F 1941 | -13°F 1990 | 32% | 21% |
| Dec 21 | 31°F | 17°F | 55°F 2020 | -25°F 1990 | 32% | 22% |
| Dec 22 | 31°F | 17°F | 58°F 1964 | -25°F 1983 | 32% | 22% |
| Dec 23 | 31°F | 17°F | 59°F 1964 | -29°F 1990 | 32% | 22% |
| Dec 24 | 31°F | 17°F | 57°F 2025 | -21°F 1990 | 32% | 22% |
| Dec 25 | 31°F | 17°F | 57°F 2025 | -15°F 1990 | 32% | 22% |
| Dec 26 | 31°F | 17°F | 57°F 1980 | -9°F 2001 | 32% | 22% |
| Dec 27 | 31°F | 17°F | 59°F 1980 | -10°F 1941 | 32% | 22% |
| Dec 28 | 31°F | 17°F | 53°F 1945 | -15°F 1954 | 33% | 22% |
| Dec 29 | 31°F | 17°F | 50°F 2017 | -17°F 1990 | 33% | 23% |
| Dec 30 | 31°F | 17°F | 57°F 2011 | -17°F 1990 | 33% | 23% |
| Dec 31 | 31°F | 17°F | 54°F 1996 | -17°F 1978 | 33% | 23% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:42 AM, sunset 4:58 PM
- December 31
- sunrise 8:02 AM, sunset 5:07 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00100227 (American Falls 6 Ne), public domain. Records: NOAA GHCN-Daily, station USW00024156, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.