Sumter Weather in December
Average highs run from 60°F on December 1 to 55°F on December 31, and lows from 37°F to 33°F. Normal precipitation for the month is 3.83 in over about 11 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
- 57°F
- Average low
- 35°F
- Precipitation
- 3.83 in
- Record high
- 84°FDec 20, 1931
- Record low
- 8°FDec 13, 1962
- Chance of a freeze
- 97%
- Daylight
- 10 h 04 min to 9 h 57 min
- Cloud cover
- 55%
- Humidity
- 79%
- Dew point
- 39°F
- Wind
- 8.1 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 | 60°F | 37°F | 80°F 1946 | 15°F 1929 | 30% | 0% |
| Dec 2 | 60°F | 37°F | 79°F 1982 | 20°F 1964 | 30% | 0% |
| Dec 3 | 60°F | 37°F | 80°F 1991 | 15°F 1960 | 30% | 0% |
| Dec 4 | 60°F | 37°F | 81°F 2021 | 18°F 1960 | 31% | 0% |
| Dec 5 | 59°F | 36°F | 77°F 1982 | 19°F 1935 | 31% | 0% |
| Dec 6 | 59°F | 36°F | 82°F 1975 | 20°F 1935 | 31% | 0% |
| Dec 7 | 59°F | 36°F | 82°F 1998 | 13°F 1937 | 32% | 0% |
| Dec 8 | 59°F | 36°F | 82°F 1998 | 15°F 2010 | 32% | 0% |
| Dec 9 | 58°F | 36°F | 83°F 1998 | 14°F 2010 | 32% | 0% |
| Dec 10 | 58°F | 36°F | 80°F 1943 | 17°F 2006 | 32% | 0% |
| Dec 11 | 58°F | 36°F | 79°F 2007 | 20°F 1937 | 33% | 0% |
| Dec 12 | 58°F | 35°F | 79°F 1946 | 9°F 1958 | 33% | 0% |
| Dec 13 | 58°F | 35°F | 79°F 1931 | 8°F 1962 | 33% | 0% |
| Dec 14 | 58°F | 35°F | 78°F 2007 | 8°F 1962 | 33% | 0% |
| Dec 15 | 57°F | 35°F | 79°F 1971 | 16°F 1962 | 33% | 0% |
| Dec 16 | 57°F | 35°F | 81°F 1971 | 12°F 1943 | 34% | 0% |
| Dec 17 | 57°F | 35°F | 79°F 1933 | 10°F 1901 | 34% | 0% |
| Dec 18 | 57°F | 35°F | 75°F 1933 | 15°F 1943 | 34% | 0% |
| Dec 19 | 57°F | 35°F | 79°F 1967 | 15°F 1975 | 34% | 0% |
| Dec 20 | 57°F | 35°F | 84°F 1931 | 17°F 1981 | 34% | 0% |
| Dec 21 | 56°F | 34°F | 78°F 1967 | 13°F 1935 | 35% | 0% |
| Dec 22 | 56°F | 34°F | 76°F 1967 | 13°F 1985 | 35% | 0% |
| Dec 23 | 56°F | 34°F | 79°F 1967 | 15°F 1935 | 35% | 0% |
| Dec 24 | 56°F | 34°F | 79°F 1990 | 12°F 1906 | 35% | 0% |
| Dec 25 | 56°F | 34°F | 80°F 1901 | 9°F 1983 | 35% | 0% |
| Dec 26 | 56°F | 34°F | 79°F 2015 | 9°F 1983 | 35% | 1% |
| Dec 27 | 56°F | 34°F | 79°F 1901 | 13°F 1935 | 36% | 1% |
| Dec 28 | 56°F | 34°F | 78°F 1946 | 18°F 1935 | 36% | 1% |
| Dec 29 | 56°F | 34°F | 79°F 2015 | 19°F 1977 | 36% | 1% |
| Dec 30 | 56°F | 33°F | 82°F 2015 | 18°F 1961 | 36% | 1% |
| Dec 31 | 55°F | 33°F | 80°F 1906 | 16°F 1983 | 36% | 1% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EST).
- December 1
- sunrise 7:08 AM, sunset 5:12 PM
- December 31
- sunrise 7:26 AM, sunset 5:23 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00388440 (Sumter), public domain. Records: NOAA GHCN-Daily, station USC00388440, 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.