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compiled a ranking of the coldest Octobers 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. October 1959
- Average temperature: 42.6°F
- Monthly high temperature: 55°F
- Monthly low temperature: 30.2°F
- Total precipitation: 1.22"

#9. October 1898
- Average temperature: 41.7°F
- Monthly high temperature: 53°F
- Monthly low temperature: 30.4°F
- Total precipitation: 1.02"

#8. October 1969
- Average temperature: 41.5°F
- Monthly high temperature: 52.2°F
- Monthly low temperature: 30.7°F
- Total precipitation: 1.53"

#7. October 2020
- Average temperature: 41.2°F
- Monthly high temperature: 53.2°F
- Monthly low temperature: 29.3°F
- Total precipitation: 1.11"

#6. October 2019
- Average temperature: 40.2°F
- Monthly high temperature: 50.9°F
- Monthly low temperature: 29.6°F
- Total precipitation: 2.12"

#5. October 1917
- Average temperature: 39.8°F
- Monthly high temperature: 53.1°F
- Monthly low temperature: 26.6°F
- Total precipitation: 0.21"

#3. October 2009 (tie)
- Average temperature: 39.5°F
- Monthly high temperature: 47.6°F
- Monthly low temperature: 31.4°F
- Total precipitation: 3.94"

#3. October 2002 (tie)
- Average temperature: 39.5°F
- Monthly high temperature: 49.6°F
- Monthly low temperature: 29.3°F
- Total precipitation: 1.46"

#2. October 1919
- Average temperature: 38.8°F
- Monthly high temperature: 50.5°F
- Monthly low temperature: 27°F
- Total precipitation: 1.94"

#1. October 1925
- Average temperature: 35.6°F
- Monthly high temperature: 46.3°F
- Monthly low temperature: 24.9°F
- Total precipitation: 0.78"