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compiled a ranking of the coldest Septembers in Washington 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 1971 (tie)
- Average temperature: 53.4°F
- Monthly high temperature: 64.9°F
- Monthly low temperature: 41.8°F
- Total precipitation: 2.97"

#9. September 1941 (tie)
- Average temperature: 53.4°F
- Monthly high temperature: 62.4°F
- Monthly low temperature: 44.4°F
- Total precipitation: 3.85"

#8. September 1970
- Average temperature: 53.2°F
- Monthly high temperature: 64.8°F
- Monthly low temperature: 41.5°F
- Total precipitation: 2.45"

#7. September 1985
- Average temperature: 53.1°F
- Monthly high temperature: 63.5°F
- Monthly low temperature: 42.6°F
- Total precipitation: 2.76"

#5. September 1972 (tie)
- Average temperature: 53°F
- Monthly high temperature: 64.5°F
- Monthly low temperature: 41.6°F
- Total precipitation: 3.39"

#5. September 1933 (tie)
- Average temperature: 53°F
- Monthly high temperature: 63.5°F
- Monthly low temperature: 42.5°F
- Total precipitation: 4"

#4. September 1901
- Average temperature: 52.9°F
- Monthly high temperature: 63.3°F
- Monthly low temperature: 42.4°F
- Total precipitation: 2.97"

#3. September 1921
- Average temperature: 52.2°F
- Monthly high temperature: 63.2°F
- Monthly low temperature: 41.1°F
- Total precipitation: 2.88"

#2. September 1926
- Average temperature: 52.1°F
- Monthly high temperature: 63.6°F
- Monthly low temperature: 40.7°F
- Total precipitation: 2.7"

#1. September 1895
- Average temperature: 51°F
- Monthly high temperature: 60.7°F
- Monthly low temperature: 41.3°F
- Total precipitation: 2.49"