Historical weather data, all-time temperature records, and monthly climate averages for Great Falls, MT. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Great Falls sits right in that transitional zone — expect a high around 52° and a low of 30°, with about a 1-in-3 chance of precipitation and a 13% shot at snow. The date has seen wild swings over the years, from a balmy 71° back in 1930 to a brutal -3° low in 1936. Spring here doesn't give up without a fight.
Great Falls has earned its rugged reputation over 134 years of records, swinging from a scorching 107° in July 1933 to a bone-crushing -49° in February 1936 — a range of 156 degrees. A single day in June 1907 dropped 3.36 inches of rain, and December 1932 buried the city under 14 inches of snow in one shot.
Great Falls runs warm from late June through early September, peaking with average highs of 87° the last week of July — the sweet spot for a visit. Winters are cold and long, with highs stuck in the mid-30s from January through February. If you want to dodge the rain, skip late May and early June, when weekly precipitation averages nearly an inch.