Historical weather data, all-time temperature records, and monthly climate averages for Saint Marys, PA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Saint Marys splits the difference between winter and spring — historically averaging a high of 52° and a low of 28°, with a 62% chance of precipitation and nearly a 1-in-5 shot of snow. The date has seen everything from 69° in 1969 to a brutal 13° low as recently as 2016, so don't pack away the layers just yet.
Saint Marys earns its Pennsylvania mountain town reputation: 83 years of records span a jaw-dropping 125 degrees, from a -25° freeze in February 2015 to a 100° scorcher in July 2011. A single November day in 1995 dropped 20 inches of snow, and a summer storm in August 1994 dumped 4.34 inches of rain in 24 hours.
Summers are pleasantly mild, peaking around 80-81° in mid-July, while winters are genuinely cold — January and February highs barely clear the freezing mark at 31° and 33°. If you're planning around rain, mid-May is the wettest stretch of the year averaging 1.2 inches in a single week, though spring generally brings the most variable conditions overall.