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compiled a ranking of the coldest Octobers in Illinois 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.

#9. October 1909 (tie)
- Average temperature: 50.2°F
- Monthly high temperature: 62.3°F
- Monthly low temperature: 38°F
- Total precipitation: 2.64"

#9. October 1896 (tie)
- Average temperature: 50.2°F
- Monthly high temperature: 62.5°F
- Monthly low temperature: 37.9°F
- Total precipitation: 1.28"

#8. October 2009
- Average temperature: 50.1°F
- Monthly high temperature: 58.4°F
- Monthly low temperature: 41.7°F
- Total precipitation: 8.49"

#7. October 1952
- Average temperature: 49.2°F
- Monthly high temperature: 64°F
- Monthly low temperature: 34.4°F
- Total precipitation: 0.67"

#5. October 1988 (tie)
- Average temperature: 48.7°F
- Monthly high temperature: 60.3°F
- Monthly low temperature: 37.1°F
- Total precipitation: 2.58"

#5. October 1987 (tie)
- Average temperature: 48.7°F
- Monthly high temperature: 60.9°F
- Monthly low temperature: 36.4°F
- Total precipitation: 1.3"

#4. October 1976
- Average temperature: 48.3°F
- Monthly high temperature: 59.7°F
- Monthly low temperature: 36.9°F
- Total precipitation: 3.18"

#3. October 1895
- Average temperature: 47.4°F
- Monthly high temperature: 60.6°F
- Monthly low temperature: 34.1°F
- Total precipitation: 0.6"

#2. October 1917
- Average temperature: 45.5°F
- Monthly high temperature: 56.5°F
- Monthly low temperature: 34.4°F
- Total precipitation: 2.89"

#1. October 1925
- Average temperature: 44.9°F
- Monthly high temperature: 53.3°F
- Monthly low temperature: 36.6°F
- Total precipitation: 3.91"