Average Annual Precipitation for Montana

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The tables below give yearly averages for rainfall plus snowfall at cities, towns and parks in Montana.

Each place has a total for the amount of precipitation it usually receives in a year. Most locations also have information on the number of days with wet weather. That includes the days when precipitation amounts to 0.01 inches (0.25 millimetres) or more.

The annual precipitation totals are averages based on weather data collected from 1981 to 2010 for the NOAA National Climatic Data Center.

You can jump to a separate table for each region of the state: Northwestern, Southwestern, South - Central and Eastern Montana.

Northwestern Montana

Average yearly precipitation
Days Place Inches Millimetres
  78 Cut Bank 10.9 276
  93 East Glacier Park 25.1 639
116 Flathead Lake, Polson 15.5 394
  87 Gibson Reservoir Dam 16.1 409
132 Kalispell 17.0 432
128 Libby 18.4 467
123 Missoula 14.1 359
118 Polebridge 19.5 494
  80 Rogers Pass 16.6 422
130 Seeley Lake 20.2 513
156 West Glacier 29.2 740
121 Whitefish 20.6 522

Southwestern Montana

Annual averages for rainfall plus snowfall
Days Place Inches Millimetres
130 Bozeman 19.7 501
108 Butte 12.8 324
  66 Deer Lodge 10.6 270
  65 Gardiner 10.0 255
123 Hebgen Lake Dam 28.0 712
  92 Helena 11.2 285
116 Sula 16.2 411
  93 Virginia City 15.3 389
  – West Yellowstone 22.8 580

South - Central Montana

Average amount of rain and snow a year
Days Place Inches Millimetres
  76 Bighorn Lake, Yellowtail Dam 17.2 436
  97 Billings 13.7 347
156 Cooke City 24.8 630
127 Mystic Lake 24.8 630
  91 Red Lodge 22.3 565

Eastern Montana

Average annual precipitation
Days Place Inches Millimetres
  70 Culbertson 13.6 346
  53 Elwell Lake, Tiber Dam 10.2 259
  71 Fort Peck Lake Dam 12.0 304
  91 Glasgow 11.7 296
  83 Glendive 13.6 344
100 Great Falls 14.8 375
  87 Havre City 11.2 284
114 Lewistown 16.9 428
  84 Miles City 12.4 316
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

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