Coeymans, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.4 °F (low) to 58.6 °F (high). Annual precipitation averages 42 Inches. Coeymans is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.2 °F | 32.9 °F | 2.62 in. |
| February | 16.6 °F | 35.7 °F | 2.25 in. |
| March | 24.8 °F | 44.3 °F | 3.2 in. |
| April | 35.9 °F | 58.2 °F | 3.51 in. |
| May | 46.9 °F | 69.9 °F | 3.35 in. |
| June | 56.1 °F | 77.7 °F | 4.42 in. |
| July | 60.9 °F | 82.3 °F | 3.93 in. |
| August | 59.3 °F | 80.5 °F | 4.25 in. |
| September | 51.5 °F | 73.5 °F | 3.76 in. |
| October | 40.5 °F | 60.8 °F | 4.34 in. |
| November | 31.0 °F | 48.8 °F | 2.92 in. |
| December | 22.4 °F | 38.0 °F | 3.4 in. |
| Annual | 38.4 °F | 58.6 °F | 41.95 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |