| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F | |
| 2012 Hardiness Zone: | 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 06459 - Middletown, CT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 22 | 29 | 38 | 49 | 58 | 63 | 61 | 54 | 43 | 35 | 25 | 41 |
| Avg Max Temp (°F) | 36 | 39 | 48 | 59 | 70 | 79 | 84 | 81 | 73 | 62 | 51 | 41 | 60 |
| Avg Precip (In.) | 4.32 | 3.2 | 4.4 | 4.39 | 4.3 | 4.24 | 4.09 | 4.33 | 4.28 | 4.32 | 4.27 | 4.03 | 50.16 |