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compiled a ranking of the coldest Septembers in California 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 1907 (tie)
- Average temperature: 65.1°F
- Monthly high temperature: 79.6°F
- Monthly low temperature: 50.6°F
- Total precipitation: 0.16"

#10. September 1901 (tie)
- Average temperature: 65.1°F
- Monthly high temperature: 79.5°F
- Monthly low temperature: 50.7°F
- Total precipitation: 1.09"

#9. September 1930
- Average temperature: 65°F
- Monthly high temperature: 78.6°F
- Monthly low temperature: 51.5°F
- Total precipitation: 0.63"

#8. September 1927
- Average temperature: 64.9°F
- Monthly high temperature: 79.3°F
- Monthly low temperature: 50.5°F
- Total precipitation: 0.19"

#7. September 1941
- Average temperature: 64.8°F
- Monthly high temperature: 79.8°F
- Monthly low temperature: 49.9°F
- Total precipitation: 0.2"

#6. September 1965
- Average temperature: 64.6°F
- Monthly high temperature: 78.8°F
- Monthly low temperature: 50.5°F
- Total precipitation: 0.16"

#5. September 1985
- Average temperature: 64.4°F
- Monthly high temperature: 76.8°F
- Monthly low temperature: 51.9°F
- Total precipitation: 1.08"

#4. September 1911
- Average temperature: 64.1°F
- Monthly high temperature: 78.2°F
- Monthly low temperature: 49.9°F
- Total precipitation: 0.44"

#3. September 1925
- Average temperature: 63.9°F
- Monthly high temperature: 77.8°F
- Monthly low temperature: 50°F
- Total precipitation: 0.7"

#2. September 1900
- Average temperature: 63.8°F
- Monthly high temperature: 77.8°F
- Monthly low temperature: 49.8°F
- Total precipitation: 0.27"

#1. September 1986
- Average temperature: 63.5°F
- Monthly high temperature: 75.8°F
- Monthly low temperature: 51.1°F
- Total precipitation: 1.4"