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compiled a ranking of the coldest Septembers in New Hampshire 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 1964 (tie)
- Average temperature: 53.9°F
- Monthly high temperature: 66.8°F
- Monthly low temperature: 41°F
- Total precipitation: 1.12"

#9. September 1938 (tie)
- Average temperature: 53.9°F
- Monthly high temperature: 65.3°F
- Monthly low temperature: 42.5°F
- Total precipitation: 9.61"

#8. September 1928
- Average temperature: 53.7°F
- Monthly high temperature: 64.9°F
- Monthly low temperature: 42.6°F
- Total precipitation: 3.63"

#7. September 1966
- Average temperature: 53.6°F
- Monthly high temperature: 65.6°F
- Monthly low temperature: 41.5°F
- Total precipitation: 4.22"

#6. September 1963
- Average temperature: 53.4°F
- Monthly high temperature: 66.8°F
- Monthly low temperature: 40.1°F
- Total precipitation: 2.47"

#5. September 1917
- Average temperature: 53.3°F
- Monthly high temperature: 66.6°F
- Monthly low temperature: 40°F
- Total precipitation: 1.22"

#3. September 1978 (tie)
- Average temperature: 53.2°F
- Monthly high temperature: 66.7°F
- Monthly low temperature: 39.8°F
- Total precipitation: 1.43"

#3. September 1950 (tie)
- Average temperature: 53.2°F
- Monthly high temperature: 64.3°F
- Monthly low temperature: 42°F
- Total precipitation: 2.54"

#2. September 1918
- Average temperature: 52.9°F
- Monthly high temperature: 63.1°F
- Monthly low temperature: 42.6°F
- Total precipitation: 7.32"

#1. September 1956
- Average temperature: 52.6°F
- Monthly high temperature: 64°F
- Monthly low temperature: 41.3°F
- Total precipitation: 5.01"