St. Marys, PA
Climate overview — based on NOAA 1991-2020 normals from GLEN HAZEL 2 NE DAM, PA US.
Year-round temperatures (°F)
Climate summary
St. Marys has an annual average temperature of 45.1°F with about 46.4 inches of precipitation per year and 66 inches of snow. The warmest month is July (average high 78.5°F), and the coldest is January (average low 13.1°F). July is typically the wettest month (4.67 in) and February the driest (2.68 in). Snow typically falls from October through May.
Best time to visit St. Marys
Full guide →Climate change signal
All-time records →162 of 366 (44.3%) of St. Marys's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1940s | 0 | |
| 1950s | 5 | |
| 1960s | 4 | |
| 1970s | 9 | |
| 1980s | 0 | |
| 1990s | 0 | |
| 2000s | 99 | |
| 2010s | 154 | |
| 2020s | 95 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 30.5°F | 13.1°F | 21.8°F | 3.47 in | 17.8 in | 19 |
| February | 33.3°F | 13.5°F | 23.4°F | 2.68 in | 15.4 in | 15 |
| March | 42.5°F | 20.9°F | 31.7°F | 3.38 in | 10.3 in | 14 |
| April | 56.4°F | 31.0°F | 43.7°F | 3.95 in | 2.0 in | 15 |
| May | 67.4°F | 41.9°F | 54.7°F | 4.32 in | 0.2 in | 15 |
| June | 74.7°F | 50.8°F | 62.8°F | 4.48 in | — | 14 |
| July | 78.5°F | 55.0°F | 66.8°F | 4.67 in | — | 12 |
| August | 77.4°F | 53.7°F | 65.5°F | 4.25 in | — | 12 |
| September | 71.1°F | 47.5°F | 59.3°F | 3.95 in | — | 12 |
| October | 58.7°F | 37.0°F | 47.8°F | 3.87 in | 0.5 in | 15 |
| November | 45.6°F | 28.0°F | 36.8°F | 3.78 in | 5.6 in | 15 |
| December | 34.5°F | 19.7°F | 27.1°F | 3.60 in | 14.2 in | 18 |
Climate twins of St. Marys
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).