Great Falls, MT weather in May 1999

Temperature for May 1999

In May 1999 the average high temperature in Great Falls, MT was 65.0°F, and this was 2.0°F cooler than the average of 67.0°F. The hottest day in May 1999 was 26 May when the temperature reached 86.0°F. Overnight the average temperature in May is 39.2°F and in 1999 the average overnight temperature was 3.9°F cooler at 35.3°F.

Precipitation for May 1999

In May the average monthly rainfall in Great Falls, MT is 2.38 inches with rain usually falling on 11 days. In May 1999 there was a total of 1.97 inches of rain, that fell on 12 days.