Oswayo, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.4 °F (low) to 56.1 °F (high). Annual precipitation averages 43.2 Inches. Oswayo is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.6 °F | 30.8 °F | 2.99 in. |
| February | 14.4 °F | 33.6 °F | 2.15 in. |
| March | 21.0 °F | 42.2 °F | 2.85 in. |
| April | 31.4 °F | 56.0 °F | 3.71 in. |
| May | 42.1 °F | 68.0 °F | 3.75 in. |
| June | 50.6 °F | 75.2 °F | 4.44 in. |
| July | 54.8 °F | 78.9 °F | 4.48 in. |
| August | 53.4 °F | 77.3 °F | 4.17 in. |
| September | 46.7 °F | 71.0 °F | 4.3 in. |
| October | 36.6 °F | 58.9 °F | 4.03 in. |
| November | 28.1 °F | 46.3 °F | 3.3 in. |
| December | 20.1 °F | 35.3 °F | 3.04 in. |
| Annual | 34.4 °F | 56.1 °F | 43.21 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |