Sumter, SC Climate

Summary Graph

The summary climate graph for Sumter, SC shows a selection of temperature, rainfall and snow minimum, mean and maximum measures over the course of a year. Click on each of the measures in the key to toggle them on and off.

Graph of average and extreme temperature ranges by day for Sumter, SC.


The warmest month in Shaw Air Force Base, Sumter, South Carolina is July with an average high temperature of 90.2°F. The hottest day on record was June 30 2012 when the temperature hit 107.2°F. During January the overnight temperature drops to an average of 37.4°F with the lowest temperature of 4.1°F being recorded on January 21 1985.

Warmest Days

Warmest Months

Coldest Days

Coldest Months

The warmest days on record are:

30 Jun 2012107.2°F
19 Jun 1970106°F
1 Jul 2012105.8°F
21 Jul 1977105.1°F
10 Aug 2007104.2°F

The warmest months on average were:

July 199396°F
August 200795.9°F
July 198695.6°F
July 197795.4°F
July 201294.7°F

The coldest days on record are:

21 Jan 19854.1°F
13 Dec 19628.1°F
18 Feb 19589°F
9 Jan 19709°F
30 Jan 196610°F

The coldest months on average were:

January 197728°F
December 201028.7°F
February 196830.5°F
December 196330.9°F
January 198831°F


The wettest month by average rainfall in Sumter, SC is June with an average of 3.1 inches of rain falling on 12 to 13 days.Although in July it typically rains on more days with 2.9 inches falling in 14 to 15 days. The driest month by average rainfall in Sumter, SC is November with an average of 1.6 inches of rain falling on 9 to 10 days. Although in October it typically rains on less days with 1.7 inches falling in 8 to 9 days

Wettest Days

The wettest days on record are:

23 December 19944.7 inches
28 December 19923.7 inches
4 December 19832.4 inches
16 December 19982.2 inches
16 December 20072.2 inches

Wettest Months

The wettest months on record are:

October 199019.6 inches
June 197317.8 inches
June 201013.9 inches
July 199113 inches
August 198511.9 inches

Driest Months

The driest months on record are:

January 19420 inches
February 19420 inches
March 19420 inches
April 19420 inches
May 19420 inches