Rapid City, SD Climate

Summary Graph

The summary climate graph for Rapid City, SD 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 Rapid City, SD.


The warmest month in Ellsworth Air Force Base, Rapid City, South Dakota is July with an average high temperature of 87.3°F. The hottest day on record was July 6 1973 when the temperature hit 110.8°F. During January the overnight temperature drops to an average of 14.2°F with the lowest temperature of -28.8°F being recorded on December 30 1990.

Warmest Days

Warmest Months

Coldest Days

Coldest Months

The warmest days on record are:

6 Jul 1973110.8°F
24 Jul 1952108°F
18 Jul 1998107.6°F
28 Jul 2006107.6°F
7 Jul 2007107.4°F

The warmest months on average were:

July 200794.7°F
July 201294.5°F
July 197493.5°F
July 193993.4°F
July 194093.4°F

The coldest days on record are:

30 Dec 1990-28.8°F
2 Feb 1996-25.1°F
21 Jan 1949-24.9°F
9 Feb 1994-24.2°F
4 Jan 1950-24°F

The coldest months on average were:

January 1950-1.3°F
January 19790.5°F
January 19490.8°F
January 19781.4°F
January 19432.8°F


The wettest month by average rainfall in Rapid City, SD is May with an average of 1.7 inches of rain falling on 13 to 14 days.Although in June it typically rains on more days with 1.5 inches falling in 14 to 15 days. The driest month by average rainfall in Rapid City, SD is December with an average of 0.3 inches of rain falling on 2 to 3 days. Although in January it typically rains on less days with 0.3 inches falling in 2 to 3 days

Wettest Days

The wettest days on record are:

25 August 20064.3 inches
30 August 19942 inches
5 August 19971.9 inches
7 August 19991.7 inches
3 August 20101.5 inches

Wettest Months

The wettest months on record are:

May 19829.1 inches
May 20088.2 inches
October 20077.9 inches
August 20067.6 inches
June 20087.3 inches

Driest Months

The driest months on record are:

March 19390 inches
April 19390 inches
May 19390 inches
June 19390 inches
July 19390 inches