Sumter weather in December: Sumter, South Carolina: normal highs, lows, rain and records for December
Sumter in December has a normal high of 57°F and a normal low of 35°F, a daily mean of 46°F, falling from 60°F on the 1st to 55°F by the 31st. Measurable precipitation falls on 11 days in a normal December, 3.83 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 14°C and low of 2°C, 97 mm of precipitation in December.
- NOAA stationSumter
- Station IDUSC00388440
- Location33.94°N 80.36°W
- Elevation177 ft (54 m)
- Population42,958
- Jan 55° 33°
- Feb 59° 35°
- Mar 66° 41°
- Apr 75° 50°
- May 81° 58°
- Jun 87° 66°
- Jul 90° 70°
- Aug 89° 68°
- Sep 83° 63°
- Oct 74° 51°
- Nov 65° 40°
- Dec 57° 35°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Sumter in December?
The normal high is 57°F and the normal low 35°F, for a daily mean of 46.2°F. December is 6.2°F cooler than November and 2.3°F warmer than January. December is the 11th warmest month of the year in Sumter and the 6th wettest. Across the month the normal high falls 5°F, from 60°F on December 1 to 55°F on December 31. From one year to the next December's mean temperature typically moves about 4.4°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 42°F and 51°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 36%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 60°F | 37°F | 30% | 19% |
| December 8 | 59°F | 36°F | 32% | 20% |
| December 15 | 57°F | 35°F | 33% | 20% |
| December 22 | 56°F | 34°F | 35% | 21% |
| December 31 | 55°F | 33°F | 36% | 21% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 60°F | 37°F | 30% | 19% | 10 h |
| December 2 | 60°F | 37°F | 30% | 19% | 10 h |
| December 3 | 60°F | 37°F | 30% | 19% | 10 h |
| December 4 | 60°F | 37°F | 31% | 19% | 10 h |
| December 5 | 59°F | 36°F | 31% | 20% | 10 h |
| December 6 | 59°F | 36°F | 31% | 20% | 10 h |
| December 7 | 59°F | 36°F | 32% | 20% | 10 h |
| December 8 | 59°F | 36°F | 32% | 20% | 10 h |
| December 9 | 58°F | 36°F | 32% | 20% | 10 h |
| December 10 | 58°F | 36°F | 32% | 20% | 10 h |
| December 11 | 58°F | 36°F | 33% | 20% | 10 h |
| December 12 | 58°F | 35°F | 33% | 20% | 10 h |
| December 13 | 58°F | 35°F | 33% | 20% | 10 h |
| December 14 | 58°F | 35°F | 33% | 20% | 10 h |
| December 15 | 57°F | 35°F | 33% | 20% | 9 h 50 min |
| December 16 | 57°F | 35°F | 34% | 21% | 9 h 50 min |
| December 17 | 57°F | 35°F | 34% | 21% | 9 h 50 min |
| December 18 | 57°F | 35°F | 34% | 21% | 9 h 50 min |
| December 19 | 57°F | 35°F | 34% | 21% | 9 h 50 min |
| December 20 | 57°F | 35°F | 34% | 21% | 9 h 50 min |
| December 21 | 56°F | 34°F | 35% | 21% | 9 h 50 min |
| December 22 | 56°F | 34°F | 35% | 21% | 9 h 50 min |
| December 23 | 56°F | 34°F | 35% | 21% | 9 h 50 min |
| December 24 | 56°F | 34°F | 35% | 21% | 9 h 50 min |
| December 25 | 56°F | 34°F | 35% | 21% | 9 h 50 min |
| December 26 | 56°F | 34°F | 35% | 21% | 9 h 50 min |
| December 27 | 56°F | 34°F | 36% | 21% | 9 h 50 min |
| December 28 | 56°F | 34°F | 36% | 21% | 9 h 50 min |
| December 29 | 56°F | 34°F | 36% | 21% | 9 h 50 min |
| December 30 | 56°F | 33°F | 36% | 21% | 10 h |
| December 31 | 55°F | 33°F | 36% | 21% | 10 h |
- Normal high
- 57°FDecember average
- Normal low
- 35°FDecember average
- Precipitation
- 3.83 inmonth total
- Days with precipitation
- 110.01 inch or more
- Nights at 32°F or colder
- 14
- Daylight
- 10 h to 10 hDecember 1 to December 31
- Days at 70°F or more
- 5
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00388440; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Sumter in December?
On a given December day the chance of 0.01 inch or more is 33% on average, highest around December 29 (36%). In all, 3.83 in falls on 11 days of a normal December, 1 of them with an inch or more.
In a normal December in Sumter, 14 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00388440.
What are the records for December in Sumter?
The warmest December temperature on this station's record (since 1901) is 84°F, on December 20, 1931; the coldest is 8°F, on December 14, 1962. The wettest December brought 9.25 in (1941); the snowiest, 5.0 inches (1958).
The December mean against the 1991-2020 normal of 46.2°F: 2021 54.4°F (+8.2), 2022 46.2°F (at normal), 2023 49.8°F (+3.6), 2024 47.5°F (+1.3), 2025 47.0°F (+0.8). 4 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 54.4°F | +8.2°F | 2.74 in |
| 2022 | 46.2°F | at normal | 3.41 in |
| 2023 | 49.8°F | +3.6°F | 4.05 in |
| 2024 | 47.5°F | +1.3°F | 1.16 in |
| 2025 | 47.0°F | +0.8°F | 3.48 in |
Source: records: ACIS, station USC00388440; recent months: ACIS, station USC00388440. Records and recent months use complete months only.
How does December in Sumter compare across South Carolina?
Across the 73 places PlainClimate covers in South Carolina, December normal highs run from 48°F in Caesars Head to 64°F in Hampton; Sumter's is 57°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.