Watertown, SD Climate

Summary Graph

The summary climate graph for Watertown, 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 Watertown, SD.


The warmest month in Watertown Regional Airport, Watertown, South Dakota is July with an average high temperature of 84.3°F. The hottest day on record was May 10 1948 when the temperature hit 120.2°F. During January the overnight temperature drops to an average of 3.8°F with the lowest temperature of -35.1°F being recorded on February 9 1994.

Warmest Days

Warmest Months

Coldest Days

Coldest Months

The warmest days on record are:

10 May 1948120.2°F
25 Jun 1988105.1°F
10 Jul 1976102.9°F
30 Jul 2006102.9°F
31 Jul 1988102°F

The warmest months on average were:

July 197692°F
August 198391.6°F
July 198890.8°F
August 197690.5°F
June 198890°F

The coldest days on record are:

9 Feb 1994-35.1°F
15 Jan 2009-34.1°F
1 Jan 1974-33.2°F
19 Jan 1985-32.3°F
2 Feb 1996-32.1°F

The coldest months on average were:

February 19480°F
January 1982-10.4°F
January 1978-10.2°F
January 1977-9.1°F
January 1979-9.1°F


The wettest month by average rainfall in Watertown, SD is June with an average of 2.7 inches of rain falling on 9 to 10 days.Although in May it typically rains on more days with 2.0 inches falling in 10 to 11 days. The driest month by average rainfall in Watertown, SD is December with an average of 0.4 inches of rain falling on 2 to 3 days. Although in January it typically rains on less days with 0.4 inches falling in 1 to 2 days

Wettest Days

The wettest days on record are:

23 March 20091.5 inches
4 March 19851.5 inches
22 March 19791.1 inches
12 March 19760.9 inches
24 March 19870.8 inches

Wettest Months

The wettest months on record are:

June 19778.6 inches
June 19906.8 inches
September 20106.6 inches
June 19936.3 inches
June 19806.3 inches

Driest Months

The driest months on record are:

February 19480 inches
March 19480 inches
April 19480 inches
May 19480 inches
June 19480 inches