Missouri and Colorado historical September temperature rankings

Historical weather data compiled from the National Centers for Environmental Information provides a ranking of the coldest Septembers in Missouri and Colorado since 1895.

In Missouri, the coldest September on record was September 1974, with an average temperature of 61.4°F. Other notable cold Septembers include 1918 (61.5°F) and 1949 (62.3°F).

In Colorado, the coldest recorded September was in 1965, featuring an average temperature of 51.9°F. This was followed by September 1961, which had an average temperature of 52.5°F.