St. Marys, PA Weather & Climate Normals
What a normal year in St. Marys actually looks like
On the 30-year record NOAA keeps for St. Marys, PA, the comfort score comes out to 44/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 5 months a year land in the 55–75°F range this site treats as mild.
How much St. Marys's weather actually swings
Average temperatures in St. Marys run from 25°F in Jan up to 69°F in Jul, a 43.9°F seasonal swing, a middling gap by national standards.
St. Marys, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 34°F | 16°F | 3.44in | 15.3in |
| Feb | 37°F | 17°F | 2.67in | 12.5in |
| Mar | 45°F | 23°F | 3.41in | 7.5in |
| Apr | 59°F | 33°F | 3.89in | 1.5in |
| May | 70°F | 43°F | 4.32in | 0in |
| Jun | 77°F | 52°F | 4.62in | 0in |
| Jul | 81°F | 57°F | 4.57in | 0in |
| Aug | 80°F | 55°F | 3.9in | 0in |
| Sep | 74°F | 49°F | 4.03in | 0in |
| Oct | 62°F | 38°F | 3.76in | 0.4in |
| Nov | 49°F | 30°F | 3.49in | 3.2in |
| Dec | 38°F | 23°F | 3.45in | 12.3in |
If you're timing a visit, May, Jun, Jul, Aug, and Sep are St. Marys's mildest stretch; if you're moving there, you should plan around Jan's cold instead.
How wet St. Marys actually gets
Over a typical year, St. Marys sees about 45.55in of precipitation a year across roughly 166 days with measurable rain or snow, with 52.7in of snow a year.
St. Marys against the rest of the country
Out of 4876 cities scored here, St. Marys comes in at 3808; within PA alone it ranks 134 of 193. Population is about 12,361.
Checking the actual forecast
These figures come from Ridgway, PA US, the NOAA station 12.1 miles from St. Marys, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is