Thiells, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.4 °F (low) to 61.8 °F (high). Annual precipitation averages 49.5 Inches. Thiells is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.8 °F | 37.5 °F | 3.68 in. |
| February | 22.6 °F | 40.4 °F | 2.74 in. |
| March | 29.6 °F | 48.4 °F | 4.12 in. |
| April | 40.0 °F | 61.1 °F | 3.93 in. |
| May | 49.7 °F | 71.2 °F | 3.7 in. |
| June | 58.9 °F | 79.8 °F | 4.76 in. |
| July | 64.1 °F | 84.8 °F | 4.35 in. |
| August | 62.6 °F | 83.0 °F | 4.87 in. |
| September | 55.3 °F | 76.2 °F | 4.57 in. |
| October | 43.9 °F | 64.2 °F | 4.56 in. |
| November | 34.5 °F | 52.9 °F | 3.95 in. |
| December | 27.1 °F | 42.4 °F | 4.27 in. |
| Annual | 42.4 °F | 61.8 °F | 49.5 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |