Montana Annual Rainfall see below for individual cities 


 

Montana city precipitation totals

City

Avg Annual Precip

Avg Snow Annual

 Avg. days of Precip

Avg # thunderstorm days

 Avg # hail days
Billings 14.77 56.4 96 27 3
Glasgow 11.23 30.8 90 20 1
Great Falls 14.89 58.3 101 25 2
Havre 11.46 43.1 90 20 1
Helena 11.32 46.4 96 30 3
Kalispell 17.21 64.0 132 23 2
Missoula 13.82 45.4 123 23 1
State Average - 15.37 inches, 45th wettest in U.S. 

Montana Precipitation Records 

  • Driest location ranked by lowest annual average precipitation: Belfry, southern Montana, 6.85"
  • Wettest location ranked by highest annual average precipitation: Many Glacier, northwest Montana, 40.85"
  • Snowiest location ranked by highest annual average snowfall: Kings Hill, central Montana, 305.5"
  • State precipitation record for 24 hours - Circle, northeast Montana, 6/19-20/1921, 11.50"
  • State precipitation record for 1 year - Summit, northwest Montana, 1953, 55.51"
  • State snowfall record for 24 hours - Shonkin, central Montana, 5/28-29/1982, 48.0"
  • State snow record for 1 season - Cooke City, southern Montana, 1977-1978,  418.1" 
  • On average, nearly 50% of Montana's annual precipitation falls during the three months of May through July

Precipitation data for other U.S. states
Data source: National Data Climatic Center