January weather forecastSumter, SC
January
Weather in January
The new year in Sumter, South Carolina, USA, kicks off with a cool and moderately humid climate. January carries the chill of winter with an average high temperature of 52.9°F (11.6°C) and a low of 38.1°F (3.4°C). The city receives a snowfall of 0.24" (6mm) during the first month, providing a hint of a Carolina winter. Relative humidity sits at approximately 70%. Moving from January into February, expect a slight warming trend in temperatures and an increase in rainfall.Temperature
January is the month when Sumter experiences its coldest temperatures, averaging a high of 52.9°F (11.6°C) and a low of 38.1°F (3.4°C).Humidity
January and November, with an average relative humidity of 70%, are the least humid months.Rainfall
January is the month with the least rainfall. Rain falls for 10.5 days and accumulates 1.89" (48mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In Sumter, in January, during 0.4 snowfall days, 0.24" (6mm) of snow is typically accumulated. Throughout the year, there are 1.3 snowfall days, and 1.06" (27mm) of snow is accumulated.Daylight
In Sumter, the average length of the day in January is 10h and 12min.On the first day of January, sunrise is at 7:26 am and sunset at 5:23 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 5:50 pm EST.
Sunshine
The average sunshine in January is 5.5h.UV index
The months with the lowest UV index in Sumter are January, February and December, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: A daily high UV index of 3 in January leads to these guidelines:
Adopt protective measures - It is advised to guard against sun damage. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Sumter, SC
- Average high temperature in January: 52.9°F
The warmest month (with the highest average high temperature) is July (90.7°F).
The month with the lowest average high temperature is January (52.9°F).
- Average low temperature in January: 38.1°F
The month with the highest average low temperature is July (72.9°F).
The coldest month (with the lowest average low temperature) is January (38.1°F).
Average pressure in January
Sumter, SC
- Average pressure in January: 30.14"Hg
The months with the highest atmospheric pressure are January, November and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed in January
Sumter, SC
- Average wind speed in January: 8mph
The windiest months (with the highest average wind speed) are February and April (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).
Average humidity in January
Sumter, SC
- Average humidity in January: 70%
The month with the highest relative humidity is May (76%).
The months with the lowest relative humidity are January and November (70%).
Average rainfall in January
Sumter, SC
- Average rainfall in January: 1.89"
The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is January (1.89").
Average rainfall days in January
Sumter, SC
- Average rainfall days in January: 10.5 days
The month with the highest number of rainy days is July (20.1 days).
The month with the least rainy days is October (8.5 days).
Average snowfall in January
Sumter, SC
- Average snowfall in January: 0.24"
The month with the highest snowfall is February (0.55").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in January
Sumter, SC
- Average snowfall days in January: 0.4 days
The month with the highest number of snowfall days is February (0.6 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in January /
Average sunshine in January
Sumter, SC
- Average daylight in January: 10h and 12min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in January: 5h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in January
Sumter, SC
- Average sunshine days in January: 19.2 days
The month with the most sunshine days is October (20.8 days).
The month with the least sunshine days is July (8.8 days).
Average UV index in January
Sumter, SC
- Average UV index in January: 3
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 3).
Average cloud cover in January
Sumter, SC
- Average cloud cover in January: 38
The months with the most cloud cover are February and December (Cloud cover 42).
The month with the least cloud cover is October (Cloud cover 29).
Average visibility in January
Sumter, SC
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
