Mercer Weather in December
Average highs run from 44°F on December 1 to 37°F on December 31, and lows from 25°F to 18°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
- 40°F
- Average low
- 21°F
- Snowfall
- 4.9 in
- Record high
- 76°FDec 3, 1982
- Record low
- -17°FDec 17, 1951
- Chance of a freeze
- 100%
- Daylight
- 9 h 26 min to 9 h 16 min
- Cloud cover
- 80%
- Humidity
- 88%
- Dew point
- 26°F
- Wind
- 5.6 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 | 44°F | 25°F | 70°F 1998 | 2°F 1929 | 10% | |
| Dec 2 | 44°F | 24°F | 73°F 1934 | 5°F 1930 | 10% | |
| Dec 3 | 43°F | 24°F | 76°F 1982 | -7°F 1976 | 11% | |
| Dec 4 | 43°F | 24°F | 72°F 1941 | -1°F 1966 | 11% | |
| Dec 5 | 43°F | 24°F | 68°F 1941 | 5°F 2002 | 11% | |
| Dec 6 | 42°F | 23°F | 76°F 2001 | 8°F 1908 | 12% | |
| Dec 7 | 42°F | 23°F | 72°F 1998 | 5°F 1926 | 12% | |
| Dec 8 | 42°F | 23°F | 70°F 1916 | 6°F 2005 | 12% | |
| Dec 9 | 42°F | 23°F | 66°F 1952 | -4°F 1917 | 13% | |
| Dec 10 | 41°F | 23°F | 70°F 1971 | -5°F 1917 | 13% | |
| Dec 11 | 41°F | 22°F | 69°F 1971 | -7°F 1904 | 13% | |
| Dec 12 | 41°F | 22°F | 64°F 2007 | -7°F 1917 | 14% | |
| Dec 13 | 41°F | 22°F | 68°F 2015 | -10°F 1960 | 14% | |
| Dec 14 | 40°F | 22°F | 66°F 1975 | 0°F 1903 | 14% | |
| Dec 15 | 40°F | 21°F | 66°F 1971 | -5°F 1914 | 15% | |
| Dec 16 | 40°F | 21°F | 66°F 1971 | -13°F 1951 | 15% | |
| Dec 17 | 40°F | 21°F | 64°F 1984 | -17°F 1951 | 15% | |
| Dec 18 | 39°F | 21°F | 64°F 1921 | -13°F 1989 | 16% | |
| Dec 19 | 39°F | 21°F | 62°F 1933 | -10°F 1989 | 16% | |
| Dec 20 | 39°F | 20°F | 60°F 1939 | -5°F 1963 | 16% | |
| Dec 21 | 39°F | 20°F | 65°F 1967 | -8°F 1942 | 16% | |
| Dec 22 | 38°F | 20°F | 67°F 1949 | -13°F 1989 | 17% | |
| Dec 23 | 38°F | 20°F | 65°F 2015 | -13°F 1945 | 17% | |
| Dec 24 | 38°F | 20°F | 66°F 1964 | -14°F 1989 | 18% | |
| Dec 25 | 38°F | 19°F | 68°F 2015 | -14°F 1989 | 18% | |
| Dec 26 | 38°F | 19°F | 63°F 1982 | -10°F 1983 | 18% | |
| Dec 27 | 37°F | 19°F | 66°F 1932 | -13°F 1950 | 19% | |
| Dec 28 | 37°F | 19°F | 70°F 1982 | -13°F 1950 | 19% | |
| Dec 29 | 37°F | 19°F | 66°F 1984 | -6°F 1924 | 19% | |
| Dec 30 | 37°F | 19°F | 64°F 1971 | -11°F 1917 | 20% | |
| Dec 31 | 37°F | 18°F | 67°F 1972 | -9°F 1963 | 20% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EST).
- December 1
- sunrise 7:27 AM, sunset 4:53 PM
- December 31
- sunrise 7:46 AM, sunset 5:02 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00365651 (Mercer), public domain. Records: NOAA GHCN-Daily, station USC00366233, 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.