May And June Rainfall Will Help Montana Streamflows While the hot weather has increased the snowmelt in Montana's mountains, May rainstorms (and even some more snow) is helping streamflow forecasts for the rest of the hot weather season in the state. The monthly report from the Natural Resources Conservation Service (NRCS) in Bozeman reported two storms in May brought precipitation records to the Seeley Lake and Lincoln areas, and the National Weather Service reported the wettest May in Montana since 2018 and 15th wettest year on record. That helps in a year when the snow at mid- to low-elevation levels melted out weeks ago, ahead of the usual schedule.