| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F | |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | Apr. 21 - Apr. 30 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 59a - Connecticut Valley | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 06067 - Rocky Hill, CT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 19 | 28 | 37 | 48 | 57 | 63 | 61 | 52 | 40 | 33 | 23 | 40 |
| Avg Max Temp (°F) | 36 | 38 | 47 | 58 | 70 | 78 | 84 | 81 | 74 | 62 | 51 | 40 | 60 |
| Avg Precip (In.) | 3.84 | 2.83 | 3.8 | 4.05 | 4.14 | 3.99 | 4.01 | 4.02 | 4.08 | 4.12 | 4.01 | 3.62 | 46.51 |