Temperature for January 2009
In January 2009 the average high temperature in Watertown, SD was 17.7°F, and this was 5.2°F cooler than the average of 22.9°F. The hottest day in January 2009 was 31 January when the temperature reached 42.1°F. Overnight the average temperature in January is 3.8°F and in 2009 the average overnight temperature was 5.7°F cooler at -1.8°F.