Putnam Valley, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.1 °C (low) to 15.9 °C (high). Annual precipitation averages 1316.5 Millimeters. Putnam Valley is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.2 °C | 2.2 °C | 95.25 mm |
| February | -6.2 °C | 4.1 °C | 73.91 mm |
| March | -2.3 °C | 8.6 °C | 105.16 mm |
| April | 3.7 °C | 15.8 °C | 100.33 mm |
| May | 9.2 °C | 21.6 °C | 97.28 mm |
| June | 14.3 °C | 25.8 °C | 122.43 mm |
| July | 17.2 °C | 28.6 °C | 118.36 mm |
| August | 16.4 °C | 27.6 °C | 132.33 mm |
| September | 12.3 °C | 23.8 °C | 128.78 mm |
| October | 6.1 °C | 17.4 °C | 125.48 mm |
| November | 0.8 °C | 10.9 °C | 107.7 mm |
| December | -3.7 °C | 4.9 °C | 109.47 mm |
| Annual | 5.1 °C | 15.9 °C | 1316.48 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |