Ulysses, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.2 °C (low) to 13 °C (high). Annual precipitation averages 1082.8 Millimeters. Ulysses 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 | -9.4 °C | -1.1 °C | 83.57 mm |
| February | -8.8 °C | 0.5 °C | 54.36 mm |
| March | -5.2 °C | 5.3 °C | 79.5 mm |
| April | 0.6 °C | 13.1 °C | 88.65 mm |
| May | 6.7 °C | 19.4 °C | 93.47 mm |
| June | 11.2 °C | 23.4 °C | 104.9 mm |
| July | 13.4 °C | 25.6 °C | 109.22 mm |
| August | 12.7 °C | 24.8 °C | 102.62 mm |
| September | 9.1 °C | 21.2 °C | 105.16 mm |
| October | 3.4 °C | 14.8 °C | 98.81 mm |
| November | -1.2 °C | 7.5 °C | 81.28 mm |
| December | -6.1 °C | 1.4 °C | 81.28 mm |
| Annual | 2.2 °C | 13 °C | 1082.82 mm |
| 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 : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |