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compiled a ranking of the coldest Septembers in South Dakota since 1895 using data from the . Rankings are based on the lowest average temperature in each month. For each of the coldest months listed below, we've included the average state temperature, state-wide highs and lows for the month, and the total precipitation.

#10. September 1984
- Average temperature: 55.9°F
- Monthly high temperature: 70.1°F
- Monthly low temperature: 41.7°F
- Total precipitation: 1.02"

#8. September 1934 (tie)
- Average temperature: 55.6°F
- Monthly high temperature: 70.2°F
- Monthly low temperature: 40.9°F
- Total precipitation: 1.81"

#8. September 1903 (tie)
- Average temperature: 55.6°F
- Monthly high temperature: 68.7°F
- Monthly low temperature: 42.6°F
- Total precipitation: 2.46"

#7. September 1929
- Average temperature: 55.5°F
- Monthly high temperature: 66.9°F
- Monthly low temperature: 44°F
- Total precipitation: 2.95"

#5. September 1918 (tie)
- Average temperature: 55.4°F
- Monthly high temperature: 69.9°F
- Monthly low temperature: 40.9°F
- Total precipitation: 1"

#5. September 1896 (tie)
- Average temperature: 55.4°F
- Monthly high temperature: 68.9°F
- Monthly low temperature: 42°F
- Total precipitation: 1.85"

#3. September 1993 (tie)
- Average temperature: 55°F
- Monthly high temperature: 68.3°F
- Monthly low temperature: 41.8°F
- Total precipitation: 1.66"

#3. September 1951 (tie)
- Average temperature: 55°F
- Monthly high temperature: 67.6°F
- Monthly low temperature: 42.4°F
- Total precipitation: 1.69"

#2. September 1912
- Average temperature: 54.4°F
- Monthly high temperature: 66.3°F
- Monthly low temperature: 42.5°F
- Total precipitation: 1.73"

#1. September 1965
- Average temperature: 49.6°F
- Monthly high temperature: 60.3°F
- Monthly low temperature: 38.9°F
- Total precipitation: 3.23"