Lowest September Temperatures in Helena

A list of the lowest temperatures ever recorded in the month of September in Helena, Montana from 1893–2024.
What's the coldest it has ever gotten in Helena in September?
The coldest September temperature in Helena, Montana history was 6 °F which occurred on September 24, 1926.
Rank Temperature Date
1 6 °F September 24, 1926
2 16 °F September 23, 1926
3 17 °F September 25, 1926
4 18 °F September 14, 1970
5 19 °F September 23, 2000
5 19 °F September 29, 1985
5 19 °F September 28, 1965
5 19 °F September 18, 1965
5 19 °F September 24, 1934
10 20 °F September 21, 1995
10 20 °F September 20, 1983
10 20 °F September 17, 1965
10 20 °F September 23, 1934
10 20 °F September 26, 1900
15 21 °F September 30, 1950
15 21 °F September 22, 1934
17 22 °F September 30, 1985
17 22 °F September 21, 1971
17 22 °F September 15, 1970
17 22 °F September 12, 1949
17 22 °F September 25, 1934
17 22 °F September 20, 1934