January weather forecast
Sumter, SC

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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.

Frequently asked questions

What month is the coldest?

Sumter, South Carolina, notes the coldest temperatures in January, with a average high of 52.9°F (11.6°C) and a low of 38.1°F (3.4°C).

What are January temperatures?

The high-temperature, in January, in Sumter, is 52.9°F (11.6°C), while the low-temperature averages to 38.1°F (3.4°C).

What are the least humid months?

January and November, with an average relative humidity of 70%, are the least humid months.

What is the average humidity in January?

The average relative humidity in January is 70%.

What is the driest month in Sumter?

The month with the least rainfall is January, when the rain falls for 10.5 days and typically collects 1.89" (48mm) of precipitation.

How many days does it rain in January?

In January, the rain falls for 10.5 days. Throughout January, 1.89" (48mm) of precipitation is accumulated.

How much does it snow in January?

In Sumter, during January, snow falls for 0.4 days and regularly aggregates up to 0.24" (6mm) of snow.

How many hours of daylight does Sumter have in January?

In Sumter, South Carolina, the average day length in January is 10h and 12min.

What time are sunrise and sunset in January?

On the first day of January in Sumter, 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.

How many hours of sunshine does Sumter have in January?

In Sumter, the average sunshine duration in January is 5.5h.

What are the months with the lowest UV index?

The months with the lowest UV index are January, February and December, with an average maximum UV index of 3.

What is the UV index reading in January?

In January, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Sumter, SC

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in January - Sumter, SC
  • Average daylight in January: 10h and 1min

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 3min

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 - 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 - 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 - 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 - 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).

Sumter, South Carolina, USA

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