| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 67k - Northern Glaciated Shale and Slate Valleys |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 10919 - Circleville, NY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 18 | 27 | 37 | 48 | 56 | 61 | 60 | 52 | 41 | 32 | 23 | 39 |
| Avg Max Temp (°F) | 34 | 38 | 48 | 60 | 71 | 79 | 83 | 81 | 74 | 63 | 50 | 39 | 60 |
| Avg Precip (In.) | 3.34 | 2.72 | 3.61 | 3.99 | 4.6 | 4.31 | 4.16 | 3.92 | 4.24 | 3.52 | 3.77 | 3.41 | 45.59 |