Annual Weather Averages Near Montana City
Averages are for Helena Regional Airport, which is 5 miles from Montana City.
Based on weather reports collected during 1992–2021.
All Year Climate & Weather Averages in Montana City
High Temp: 87 °F
Low Temp: 14 °F
Mean Temp: 46 °F
Precipitation: 0.98"
Humidity: 55%
Dew Point: 29 °F
Wind: 9 mph
Pressure: 30.07 "Hg
Visibility: 10 mi
January Climate & Weather Averages in Montana City
High Temp: 34 °F
Low Temp: 14 °F
Mean Temp: 24 °F
Precipitation: 0.43"
Humidity: 70%
Dew Point: 15 °F
Wind: 8 mph
Pressure: 30.20 "Hg
Visibility: 9 mi
February Climate & Weather Averages in Montana City
High Temp: 37 °F
Low Temp: 17 °F
Mean Temp: 27 °F
Precipitation: 0.62"
Humidity: 65%
Dew Point: 16 °F
Wind: 9 mph
Pressure: 30.16 "Hg
Visibility: 9 mi
March Climate & Weather Averages in Montana City
High Temp: 48 °F
Low Temp: 25 °F
Mean Temp: 37 °F
Precipitation: 0.54"
Humidity: 57%
Dew Point: 22 °F
Wind: 11 mph
Pressure: 30.08 "Hg
Visibility: 10 mi
April Climate & Weather Averages in Montana City
High Temp: 57 °F
Low Temp: 32 °F
Mean Temp: 45 °F
Precipitation: 1.06"
Humidity: 52%
Dew Point: 27 °F
Wind: 12 mph
Pressure: 30.02 "Hg
Visibility: 10 mi
May Climate & Weather Averages in Montana City
High Temp: 67 °F
Low Temp: 41 °F
Mean Temp: 54 °F
Precipitation: 1.92"
Humidity: 51%
Dew Point: 35 °F
Wind: 11 mph
Pressure: 29.99 "Hg
Visibility: 10 mi
June Climate & Weather Averages in Montana City
High Temp: 76 °F
Low Temp: 49 °F
Mean Temp: 62 °F
Precipitation: 2.10"
Humidity: 50%
Dew Point: 42 °F
Wind: 11 mph
Pressure: 29.95 "Hg
Visibility: 10 mi
July Climate & Weather Averages in Montana City
High Temp: 87 °F
Low Temp: 55 °F
Mean Temp: 71 °F
Precipitation: 1.05"
Humidity: 41%
Dew Point: 44 °F
Wind: 9 mph
Pressure: 29.98 "Hg
Visibility: 10 mi
August Climate & Weather Averages in Montana City
High Temp: 85 °F
Low Temp: 53 °F
Mean Temp: 69 °F
Precipitation: 1.14"
Humidity: 41%
Dew Point: 43 °F
Wind: 8 mph
Pressure: 29.99 "Hg
Visibility: 10 mi
September Climate & Weather Averages in Montana City
High Temp: 74 °F
Low Temp: 44 °F
Mean Temp: 59 °F
Precipitation: 0.98"
Humidity: 47%
Dew Point: 37 °F
Wind: 9 mph
Pressure: 30.03 "Hg
Visibility: 10 mi
October Climate & Weather Averages in Montana City
High Temp: 58 °F
Low Temp: 33 °F
Mean Temp: 46 °F
Precipitation: 0.79"
Humidity: 57%
Dew Point: 30 °F
Wind: 9 mph
Pressure: 30.10 "Hg
Visibility: 10 mi
November Climate & Weather Averages in Montana City
High Temp: 44 °F
Low Temp: 23 °F
Mean Temp: 34 °F
Precipitation: 0.60"
Humidity: 63%
Dew Point: 22 °F
Wind: 9 mph
Pressure: 30.16 "Hg
Visibility: 9 mi
December Climate & Weather Averages in Montana City
High Temp: 34 °F
Low Temp: 15 °F
Mean Temp: 24 °F
Precipitation: 0.51"
Humidity: 69%
Dew Point: 15 °F
Wind: 8 mph
Pressure: 30.19 "Hg
Visibility: 9 mi