Sumter in Winter
In winter (December, January and February), Sumter sees average daytime highs around 58°F and overnight lows near 39°F, with 10.4 in of precipitation over about 26 wet days across the season. It is the coldest season of the year and the 2nd-wettest season.
Across winter, daytime highs hold fairly steady around 58°F. The sky is clear or mostly clear about 37% of the time across winter, and the air most often feels dry.
Winter is Sumter's 3rd-best season to visit on our travel score. For the whole year in context, see Sumter's year-round climate.
- Avg daytime high
- 58°F
- coldest season of the year
- Avg overnight low
- 39°F
- Precipitation
- 10.4 in
- 26 wet days
- Avg wind
- 8 mph
- Travel score
- 4.6
- 3rd-best season
- Months
- Dec · Jan · Feb
Temperature in Sumter in Winter
Across winter, daytime highs hold fairly steady around 58°F.
A typical winter day in Sumter reaches about 58°F and drops to 39°F overnight. The warmest of the three months is February, the coolest January.
How winter really feels in Sumter
Once humidity and wind are folded in, winter brings about 0 days that feel above 90°F and 28 that feel at or below 32°F.
The story in winter is cold — wind chill drags the overnight "feels like" below the raw low.
Sumter weather by month
How the three winter months (December, January and February) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 56° / 37° | 3.5 | 8.9 | 0.5 | 10 | 4.1 |
| Feb | 60° / 40° | 3.3 | 8.6 | 0.3 | 10.7 | 4.9 |
| Mar | 67° / 46° | 3.4 | 9.4 | 0.1 | 11.7 | 6.4 |
| Apr | 76° / 54° | 3.4 | 8 | 0 | 12.8 | 7.2 |
| May | 82° / 63° | 3.1 | 9.5 | 0 | 13.7 | 6.2 |
| Jun | 88° / 71° | 4.2 | 13.2 | 0 | 14.2 | 4.1 |
| Jul | 91° / 74° | 4.7 | 15.5 | 0 | 14 | 3.2 |
| Aug | 89° / 73° | 4.7 | 14.5 | 0 | 13.3 | 3.7 |
| Sep | 84° / 67° | 4.2 | 10 | 0 | 12.2 | 5.6 |
| Oct | 75° / 56° | 3.3 | 7.6 | 0 | 11.1 | 7.4 |
| Nov | 66° / 45° | 2.8 | 7.2 | 0 | 10.2 | 6.6 |
| Dec | 59° / 40° | 3.7 | 8.6 | 0.1 | 9.8 | 4.7 |
Cloud cover in Winter
The sky is clear or mostly clear about 37% of the time across winter.
Chance of precipitation in Winter
Sumter gets around 10.4 in of rain and snow over 26 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 8 mph across winter.
Sunrise & sunset in Winter
Daylight runs from about 9 h 54 min in early December to 11 h 12 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 2.9 kWh/m².
Is winter a good time to visit Sumter?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter is a reasonable time to visit Sumter for sightseeing.
What to pack for Sumter in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Sumter sees daytime highs around 58°F and nights near 39°F. Worth packing: a warm layer and rain gear. About 26 days see rain.
UV index in Sumter in Winter
Clear-sky midday UV across winter averages around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Sumter peaks around July 13 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 5 | 6 | 7 | 8 | 9 | 9 | 8 | 7 | 5 | 4 | 3 |
| Level | Moderate | Moderate | High | High | Very high | Very high | Very high | Very high | Very high | Moderate | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 5 | Moderate |
| Mar | 6 | High |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 7 | Very high |
| Oct | 5 | Moderate |
| Nov | 4 | Moderate |
| Dec | 3 | Moderate |
Air quality in Sumter in Winter
Average fine-particle pollution (PM2.5) through the year — so you can see where winter falls, not just the annual average.
Air quality in Sumter is worst in March — around 18 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 8 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 8 | 11 | 18 | 13 | 13 | 17 | 18 | 16 | 12 | 9 | 8 | 8 |
| Level | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 8 | Good |
| Feb | 11 | Good |
| Mar | 18 | Moderate |
| Apr | 13 | Moderate |
| May | 13 | Moderate |
| Jun | 17 | Moderate |
| Jul | 18 | Moderate |
| Aug | 16 | Moderate |
| Sep | 12 | Good |
| Oct | 9 | Good |
| Nov | 8 | Good |
| Dec | 8 | Good |
Where is Sumter?
Sumter sits at 33.9°N, 80.3°W, 171 ft above sea level, in United States. The nearest listed city is Florence, 38 mi away.
Topography around Sumter
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Sumter.
Within 2 miles, the terrain around Sumter has only modest variations in elevation — a maximum elevation change of 98 ft around an average of 171 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 305 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,079 ft.
The land around Sumter is covered by trees (63%) and artificial surfaces (25%) within 2 miles, trees (64%) within 10 miles, and trees (75%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Sumter (33.9204°, -80.3415°, elevation 171 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.