US Geography / US Weather / Pennsylvania Weather / St Marys |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 31 | 34 | 45 | 56 | 68 | 76 | 80 | 78 | 71 | 60 | 48 | 36 |
| Avg. Low | 11 | 11 | 21 | 30 | 38 | 48 | 54 | 52 | 45 | 34 | 28 | 18 |
| Mean | 22 | 24 | 34 | 44 | 54 | 62 | 67 | 65 | 58 | 48 | 38 | 28 |
| Avg. Precip. | 2.4 in | 2.4 in | 3.3 in | 3.4 in | 4.4 in | 4.7 in | 4.6 in | 3.9 in | 3.6 in | 3.1 in | 3.5 in | 3.1 in |
Degrees in Fahrenheit
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