McLean Weather in December
Average highs run from 56°F on December 1 to 51°F on December 31, and lows from 32°F to 27°F. Normal precipitation for the month is 0.98 in over about 2 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
- 52°F
- Average low
- 29°F
- Precipitation
- 0.98 in
- Snowfall
- 2.9 in
- Record high
- 86°FDec 25, 2025
- Record low
- -8°FDec 23, 1989
- Chance of a freeze
- 100%
- Daylight
- 9 h 57 min to 9 h 49 min
- Cloud cover
- 52%
- Humidity
- 61%
- Dew point
- 25°F
- Wind
- 10.7 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 | 56°F | 32°F | 79°F 1973 | 5°F 1985 | 9% | 3% |
| Dec 2 | 56°F | 31°F | 76°F 1995 | 3°F 1985 | 9% | 3% |
| Dec 3 | 56°F | 31°F | 78°F 2021 | 3°F 1985 | 9% | 3% |
| Dec 4 | 55°F | 31°F | 78°F 1977 | 9°F 2009 | 9% | 3% |
| Dec 5 | 55°F | 31°F | 74°F 1975 | 9°F 2009 | 8% | 3% |
| Dec 6 | 54°F | 30°F | 76°F 1987 | 0°F 1972 | 8% | 3% |
| Dec 7 | 54°F | 30°F | 71°F 1966 | 0°F 1972 | 8% | 3% |
| Dec 8 | 54°F | 30°F | 78°F 2023 | -3°F 2005 | 8% | 3% |
| Dec 9 | 53°F | 30°F | 76°F 1970 | -3°F 2005 | 8% | 3% |
| Dec 10 | 53°F | 29°F | 80°F 1996 | 2°F 1978 | 8% | 3% |
| Dec 11 | 53°F | 29°F | 73°F 1979 | 3°F 1972 | 8% | 3% |
| Dec 12 | 53°F | 29°F | 79°F 2025 | 7°F 1989 | 8% | 3% |
| Dec 13 | 52°F | 29°F | 75°F 1977 | 7°F 1989 | 8% | 3% |
| Dec 14 | 52°F | 29°F | 72°F 1995 | 8°F 1985 | 8% | 3% |
| Dec 15 | 52°F | 28°F | 79°F 2021 | 1°F 1989 | 8% | 3% |
| Dec 16 | 52°F | 28°F | 77°F 2010 | 1°F 1989 | 8% | 3% |
| Dec 17 | 51°F | 28°F | 73°F 2016 | 0°F 1964 | 8% | 3% |
| Dec 18 | 51°F | 28°F | 79°F 1980 | -4°F 2016 | 8% | 3% |
| Dec 19 | 51°F | 28°F | 72°F 1978 | -5°F 2016 | 8% | 3% |
| Dec 20 | 51°F | 28°F | 73°F 1978 | 2°F 1996 | 8% | 3% |
| Dec 21 | 51°F | 27°F | 71°F 2004 | -3°F 1990 | 8% | 3% |
| Dec 22 | 51°F | 27°F | 75°F 2003 | -7°F 1983 | 8% | 3% |
| Dec 23 | 51°F | 27°F | 83°F 2025 | -8°F 1989 | 8% | 3% |
| Dec 24 | 51°F | 27°F | 79°F 2025 | -6°F 1990 | 8% | 3% |
| Dec 25 | 51°F | 27°F | 86°F 2025 | -2°F 2004 | 8% | 3% |
| Dec 26 | 51°F | 27°F | 83°F 2025 | -2°F 1983 | 8% | 3% |
| Dec 27 | 51°F | 27°F | 78°F 2025 | 2°F 2012 | 8% | 3% |
| Dec 28 | 51°F | 27°F | 79°F 2025 | 6°F 1987 | 8% | 3% |
| Dec 29 | 51°F | 27°F | 75°F 1965 | -5°F 1983 | 8% | 3% |
| Dec 30 | 51°F | 27°F | 74°F 2005 | -1°F 1983 | 8% | 3% |
| Dec 31 | 51°F | 27°F | 72°F 2008 | -2°F 1990 | 8% | 3% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- December 1
- sunrise 7:33 AM, sunset 5:30 PM
- December 31
- sunrise 7:51 AM, sunset 5:40 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00415770 (Mc Lean), public domain. Records: NOAA GHCN-Daily, station USC00416776, 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.