Brownville, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37 °F (low) to 55.2 °F (high). Annual precipitation averages 41.7 Inches. Brownville is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.7 °F | 29.1 °F | 3.64 in. |
| February | 11.2 °F | 30.7 °F | 2.72 in. |
| March | 21.4 °F | 39.1 °F | 2.82 in. |
| April | 34.3 °F | 53.4 °F | 3.42 in. |
| May | 46.3 °F | 66.3 °F | 3.13 in. |
| June | 55.9 °F | 74.8 °F | 3.31 in. |
| July | 61.4 °F | 79.4 °F | 3.05 in. |
| August | 59.8 °F | 78.3 °F | 3.32 in. |
| September | 51.9 °F | 71.5 °F | 3.58 in. |
| October | 40.9 °F | 58.6 °F | 4.87 in. |
| November | 30.6 °F | 46.5 °F | 4.04 in. |
| December | 20.0 °F | 35.1 °F | 3.8 in. |
| Annual | 37 °F | 55.2 °F | 41.7 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| 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 |