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compiled a ranking of the coldest Septembers in Oregon 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.

#10. September 1971 (tie)
- Average temperature: 53.8°F
- Monthly high temperature: 67.8°F
- Monthly low temperature: 39.9°F
- Total precipitation: 2.42"

#10. September 1970 (tie)
- Average temperature: 53.8°F
- Monthly high temperature: 68°F
- Monthly low temperature: 39.5°F
- Total precipitation: 1.37"

#9. September 1941
- Average temperature: 53.6°F
- Monthly high temperature: 64.9°F
- Monthly low temperature: 42.4°F
- Total precipitation: 2.2"

#8. September 1912
- Average temperature: 53.3°F
- Monthly high temperature: 66.9°F
- Monthly low temperature: 39.7°F
- Total precipitation: 1.41"

#7. September 1901
- Average temperature: 52.9°F
- Monthly high temperature: 64.2°F
- Monthly low temperature: 41.5°F
- Total precipitation: 2.9"

#4. September 1986 (tie)
- Average temperature: 52.6°F
- Monthly high temperature: 63.8°F
- Monthly low temperature: 41.3°F
- Total precipitation: 3.3"

#4. September 1921 (tie)
- Average temperature: 52.6°F
- Monthly high temperature: 66.6°F
- Monthly low temperature: 38.6°F
- Total precipitation: 1.43"

#4. September 1911 (tie)
- Average temperature: 52.6°F
- Monthly high temperature: 64.6°F
- Monthly low temperature: 40.6°F
- Total precipitation: 2.51"

#3. September 1926
- Average temperature: 52.3°F
- Monthly high temperature: 66.1°F
- Monthly low temperature: 38.5°F
- Total precipitation: 0.93"

#2. September 1985
- Average temperature: 52.1°F
- Monthly high temperature: 64°F
- Monthly low temperature: 40.3°F
- Total precipitation: 2.19"

#1. September 1895
- Average temperature: 51.5°F
- Monthly high temperature: 62.4°F
- Monthly low temperature: 40.6°F
- Total precipitation: 2.33"