Theresa, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.8 °F (low) to 54.8 °F (high). Annual precipitation averages 40.5 Inches. Theresa is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.8 °F | 27.9 °F | 3.1 in. |
| February | 10.6 °F | 29.9 °F | 2.43 in. |
| March | 20.8 °F | 38.8 °F | 2.85 in. |
| April | 33.8 °F | 53.0 °F | 3.18 in. |
| May | 45.7 °F | 66.2 °F | 3.27 in. |
| June | 55.3 °F | 74.9 °F | 3.63 in. |
| July | 61.7 °F | 78.7 °F | 3.24 in. |
| August | 60.4 °F | 78.3 °F | 3.49 in. |
| September | 52.2 °F | 71.0 °F | 3.6 in. |
| October | 40.7 °F | 58.6 °F | 4.69 in. |
| November | 30.3 °F | 45.9 °F | 3.54 in. |
| December | 20.1 °F | 34.1 °F | 3.49 in. |
| Annual | 36.8 °F | 54.8 °F | 40.51 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |