St. Marys, OH
Climate overview — based on NOAA 1991-2020 normals from ST MARYS 3 W, OH US.
Year-round temperatures (°F)
Avg high
Avg low
Best time to visit St. Marys
Full guide →Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | °F | °F | °F | 2.43 in | 3.9 in | 8 |
| February | °F | °F | °F | 2.19 in | 3.1 in | 7 |
| March | °F | °F | °F | 2.67 in | 1.1 in | 9 |
| April | °F | °F | °F | 3.38 in | — | 11 |
| May | °F | °F | °F | 4.05 in | — | 11 |
| June | °F | °F | °F | 4.33 in | — | 10 |
| July | °F | °F | °F | 4.35 in | — | 8 |
| August | °F | °F | °F | 3.39 in | — | 8 |
| September | °F | °F | °F | 2.96 in | — | 7 |
| October | °F | °F | °F | 2.73 in | — | 8 |
| November | °F | °F | °F | 2.91 in | 0.1 in | 7 |
| December | °F | °F | °F | 2.28 in | 2.2 in | 8 |
Last spring / first fall frost
All-time recordsHottest, coldest, wettest
Planting calendarWhat to plant, and when