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compiled a ranking of the coldest Septembers in Colorado 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. September 1973 (tie)
- Average temperature: 54.8°F
- Monthly high temperature: 68.4°F
- Monthly low temperature: 41.3°F
- Total precipitation: 1.89"

#9. September 1923 (tie)
- Average temperature: 54.8°F
- Monthly high temperature: 68.5°F
- Monthly low temperature: 41.1°F
- Total precipitation: 1.75"

#9. September 1918 (tie)
- Average temperature: 54.8°F
- Monthly high temperature: 68.2°F
- Monthly low temperature: 41.3°F
- Total precipitation: 2.21"

#9. September 1903 (tie)
- Average temperature: 54.8°F
- Monthly high temperature: 70°F
- Monthly low temperature: 39.5°F
- Total precipitation: 1.33"

#8. September 1929
- Average temperature: 54.6°F
- Monthly high temperature: 67.6°F
- Monthly low temperature: 41.6°F
- Total precipitation: 2.66"

#7. September 1985
- Average temperature: 54.3°F
- Monthly high temperature: 67.6°F
- Monthly low temperature: 41°F
- Total precipitation: 2.38"

#6. September 1913
- Average temperature: 54°F
- Monthly high temperature: 67.8°F
- Monthly low temperature: 40.2°F
- Total precipitation: 1.88"

#5. September 1971
- Average temperature: 53.8°F
- Monthly high temperature: 68.6°F
- Monthly low temperature: 39°F
- Total precipitation: 1.8"

#4. September 2006
- Average temperature: 53.5°F
- Monthly high temperature: 67.5°F
- Monthly low temperature: 39.6°F
- Total precipitation: 2.19"

#3. September 1961
- Average temperature: 52.5°F
- Monthly high temperature: 65.6°F
- Monthly low temperature: 39.4°F
- Total precipitation: 3.09"

#2. September 1965
- Average temperature: 51.9°F
- Monthly high temperature: 64°F
- Monthly low temperature: 39.8°F
- Total precipitation: 2.55"

#1. September 1912
- Average temperature: 51°F
- Monthly high temperature: 64.8°F
- Monthly low temperature: 37.1°F
- Total precipitation: 1.32"