Average Annual Precipitation for Montana





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. There is also a count of the number of days with wet weather, when precipitation amounts to 0.01 inches (0.25 millimetres) or more.

The annual precipitation totals are averages based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.

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
77 Cut Bank 10.8 274
80 Gibson Reservoir Dam 16.6 420
132 Kalispell 16.8 426
125 Libby 19.2 486
124 Missoula 14.1 358
104 Polson 15.0 381
88 Rogers Pass 17.1 434
140 Seeley Lake 21.6 549
162 West Glacier 30.9 784
122 Whitefish 19.9 506

Southwestern Montana

Annual averages for rainfall plus snowfall
Days Place Inches Milli­metres
125 Anaconda 14.9 378
138 Bozeman 20.0 509
107 Butte 12.8 324
78 Dillon 11.3 286
118 Hebgen Lake Dam 28.6 727
91 Helena 11.4 290
112 Sula 16.2 412
93 Virginia City 15.7 398

South - Central Montana

Average amount of rain and snow a year
Days Place Inches Milli­metres
66 Bighorn Lake, Yellowtail Dam 16.7 423
97 Billings 14.3 363
159 Cooke City 26.6 675
131 Mystic Lake 26.5 673
92 Red Lodge 22.7 576

Eastern Montana

Average annual precipitation
Days Place Inches Milli­metres
74 Culbertson 14.5 369
50 Elwell Lake, Tiber Dam 10.2 258
73 Fort Peck Lake Dam 13.6 345
95 Glasgow 13.4 341
91 Glendive 14.9 378
98 Great Falls 14.8 375
90 Havre City 11.8 300
116 Lewistown 17.2 436
87 Miles City 12.9 327
Reference

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Montana Precipitation
Back to Top