Mountain Home Weather in December
Average highs run from 43°F on December 1 to 38°F on December 31, and lows from 25°F to 23°F.
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
- 39°F
- Average low
- 23°F
- Record high
- 74°FDec 10, 1939
- Record low
- -32°FDec 22, 1990
- Chance of a freeze
- 100%
- Daylight
- 9 h 14 min to 9 h 03 min
- Cloud cover
- 65%
- Humidity
- 76%
- Dew point
- 22°F
- Wind
- 8.1 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Dec 1 | 43°F | 25°F | 63°F 1962 | 10°F 1969 | |
| Dec 2 | 42°F | 25°F | 63°F 1995 | 12°F 1969 | |
| Dec 3 | 42°F | 25°F | 64°F 1943 | 12°F 1997 | |
| Dec 4 | 42°F | 25°F | 62°F 1979 | 9°F 2006 | |
| Dec 5 | 41°F | 25°F | 66°F 1939 | -6°F 1972 | |
| Dec 6 | 41°F | 25°F | 68°F 1987 | 1°F 1992 | |
| Dec 7 | 41°F | 24°F | 60°F 1939 | 5°F 1972 | |
| Dec 8 | 40°F | 24°F | 62°F 1981 | 2°F 1972 | |
| Dec 9 | 40°F | 24°F | 59°F 1990 | -21°F 1972 | |
| Dec 10 | 40°F | 24°F | 74°F 1939 | -26°F 1972 | |
| Dec 11 | 39°F | 24°F | 65°F 1939 | -23°F 1972 | |
| Dec 12 | 39°F | 24°F | 68°F 1995 | -12°F 1972 | |
| Dec 13 | 39°F | 23°F | 58°F 1977 | -12°F 1972 | |
| Dec 14 | 39°F | 23°F | 60°F 1977 | -15°F 1972 | |
| Dec 15 | 39°F | 23°F | 60°F 2006 | -16°F 1972 | |
| Dec 16 | 38°F | 23°F | 64°F 1939 | 2°F 1967 | |
| Dec 17 | 38°F | 23°F | 57°F 1939 | -3°F 1964 | |
| Dec 18 | 38°F | 23°F | 57°F 1979 | 0°F 2005 | |
| Dec 19 | 38°F | 23°F | 56°F 1940 | -8°F 1984 | |
| Dec 20 | 38°F | 23°F | 61°F 1964 | -6°F 1984 | |
| Dec 21 | 38°F | 23°F | 65°F 1964 | -15°F 1990 | |
| Dec 22 | 38°F | 23°F | 68°F 1964 | -32°F 1990 | |
| Dec 23 | 38°F | 23°F | 65°F 1964 | -28°F 1990 | |
| Dec 24 | 38°F | 23°F | 59°F 1964 | -23°F 1990 | |
| Dec 25 | 38°F | 23°F | 54°F 1980 | -24°F 1990 | |
| Dec 26 | 38°F | 23°F | 58°F 1976 | -2°F 1985 | |
| Dec 27 | 38°F | 23°F | 59°F 1980 | -5°F 1985 | |
| Dec 28 | 38°F | 23°F | 58°F 1965 | -5°F 1985 | |
| Dec 29 | 38°F | 23°F | 61°F 1996 | -5°F 1985 | |
| Dec 30 | 38°F | 23°F | 62°F 2008 | -19°F 1990 | |
| Dec 31 | 38°F | 23°F | 61°F 1996 | -3°F 1978 |
Chance of rain
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:55 AM, sunset 5:09 PM
- December 31
- sunrise 8:14 AM, sunset 5:17 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00106174 (Mtn Home), public domain. Records: NOAA GHCN-Daily, station USC00101195, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.