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compiled a ranking of the coldest Mays 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. May 1967 (tie)
- Average temperature: 58°F
- Monthly high temperature: 69.1°F
- Monthly low temperature: 46.8°F
- Total precipitation: 3.98"

#9. May 1966 (tie)
- Average temperature: 58°F
- Monthly high temperature: 69.8°F
- Monthly low temperature: 46.2°F
- Total precipitation: 4.51"

#8. May 1961
- Average temperature: 57.8°F
- Monthly high temperature: 69.7°F
- Monthly low temperature: 45.9°F
- Total precipitation: 5.17"

#7. May 1997
- Average temperature: 57.5°F
- Monthly high temperature: 69°F
- Monthly low temperature: 46.1°F
- Total precipitation: 4.03"

#6. May 1945
- Average temperature: 57.1°F
- Monthly high temperature: 67.7°F
- Monthly low temperature: 46.4°F
- Total precipitation: 5.37"

#5. May 1910
- Average temperature: 57°F
- Monthly high temperature: 68.1°F
- Monthly low temperature: 45.9°F
- Total precipitation: 4.99"

#4. May 1935
- Average temperature: 56.9°F
- Monthly high temperature: 66.3°F
- Monthly low temperature: 47.4°F
- Total precipitation: 7.83"

#2. May 1924 (tie)
- Average temperature: 55.9°F
- Monthly high temperature: 67.3°F
- Monthly low temperature: 44.5°F
- Total precipitation: 3.52"

#2. May 1907 (tie)
- Average temperature: 55.9°F
- Monthly high temperature: 67.4°F
- Monthly low temperature: 44.4°F
- Total precipitation: 4.02"

#1. May 1917
- Average temperature: 55.8°F
- Monthly high temperature: 67.4°F
- Monthly low temperature: 44.3°F
- Total precipitation: 4.21"