McNary Weather in December
Average highs run from 48°F on December 1 to 43°F on December 31, and lows from 23°F to 20°F. Normal precipitation for the month is 2.26 in over about 8 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
- 45°F
- Average low
- 21°F
- Precipitation
- 2.26 in
- Snowfall
- 12.8 in
- Record high
- 68°FDec 1, 2003
- Record low
- -22°FDec 23, 1990
- Chance of a freeze
- 100%
- Daylight
- 10 h 03 min to 9 h 55 min
- Cloud cover
- 51%
- Humidity
- 59%
- Dew point
- 20°F
- Wind
- 7.4 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 | 48°F | 23°F | 68°F 2003 | 5°F 1976 | 21% | 14% |
| Dec 2 | 48°F | 23°F | 65°F 1995 | 1°F 1991 | 21% | 14% |
| Dec 3 | 47°F | 23°F | 67°F 1977 | 7°F 1991 | 21% | 15% |
| Dec 4 | 47°F | 23°F | 64°F 1977 | 5°F 1991 | 22% | 15% |
| Dec 5 | 47°F | 22°F | 68°F 1995 | 9°F 2005 | 22% | 15% |
| Dec 6 | 46°F | 22°F | 65°F 1970 | -1°F 2011 | 22% | 16% |
| Dec 7 | 46°F | 22°F | 66°F 1970 | -9°F 1978 | 22% | 16% |
| Dec 8 | 46°F | 22°F | 66°F 1996 | -12°F 1978 | 23% | 17% |
| Dec 9 | 45°F | 22°F | 66°F 1981 | -11°F 1978 | 23% | 17% |
| Dec 10 | 45°F | 21°F | 65°F 1987 | -7°F 1978 | 23% | 17% |
| Dec 11 | 45°F | 21°F | 62°F 1977 | -1°F 1978 | 24% | 18% |
| Dec 12 | 45°F | 21°F | 67°F 2004 | 1°F 1978 | 24% | 18% |
| Dec 13 | 44°F | 21°F | 67°F 2010 | -5°F 2001 | 24% | 18% |
| Dec 14 | 44°F | 21°F | 65°F 1969 | -3°F 1987 | 24% | 19% |
| Dec 15 | 44°F | 21°F | 67°F 1969 | -2°F 1975 | 25% | 19% |
| Dec 16 | 44°F | 21°F | 64°F 1969 | 2°F 2015 | 25% | 19% |
| Dec 17 | 44°F | 21°F | 66°F 2025 | -2°F 1971 | 25% | 19% |
| Dec 18 | 44°F | 20°F | 61°F 2023 | 0°F 1971 | 25% | 19% |
| Dec 19 | 44°F | 20°F | 66°F 2025 | 2°F 1971 | 25% | 20% |
| Dec 20 | 43°F | 20°F | 64°F 2003 | 1°F 1965 | 25% | 20% |
| Dec 21 | 43°F | 20°F | 66°F 1969 | 2°F 1965 | 25% | 20% |
| Dec 22 | 43°F | 20°F | 68°F 2025 | -12°F 1967 | 26% | 20% |
| Dec 23 | 43°F | 20°F | 68°F 2025 | -22°F 1990 | 26% | 20% |
| Dec 24 | 43°F | 20°F | 61°F 1971 | -15°F 1967 | 26% | 20% |
| Dec 25 | 43°F | 20°F | 63°F 2005 | -9°F 1967 | 26% | 20% |
| Dec 26 | 43°F | 20°F | 62°F 2006 | -11°F 1990 | 26% | 20% |
| Dec 27 | 43°F | 20°F | 61°F 2017 | -7°F 1990 | 26% | 20% |
| Dec 28 | 43°F | 20°F | 61°F 1998 | -10°F 1966 | 26% | 20% |
| Dec 29 | 43°F | 20°F | 65°F 2017 | -8°F 1966 | 26% | 20% |
| Dec 30 | 43°F | 20°F | 66°F 2017 | -8°F 1966 | 26% | 20% |
| Dec 31 | 43°F | 20°F | 59°F 2017 | -3°F 1969 | 26% | 20% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:07 AM, sunset 5:10 PM
- December 31
- sunrise 7:25 AM, sunset 5:20 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00025412 (Mc Nary 2N), public domain. Records: NOAA GHCN-Daily, station USC00027855, 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.