St. Mary stays cool in summer
St. Mary has cold winters and cool summers. A typical July afternoon reaches 75°, a January night drops to 13°.
Getting the latest forecast from the National Weather Service…
What stands out about St. Mary’s weather
Read from 30 years of NOAA records. Each one opens the full story on the Climate page.
Where today sits in St. Mary’s year
Typical highs and lows month by month, from 30 years of NOAA records.
Weather talk
Road reports, first frosts and storm memories from neighbors in St. Mary.
Your answer becomes a post in Town Square.
Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for St. Mary itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at St Mary, MT (1 mi, frost, heat and degree days). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.