| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°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: | May 1 - May 10 | |
| 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 06106 - Hartford, CT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 19 | 27 | 37 | 48 | 57 | 62 | 61 | 52 | 40 | 32 | 22 | 39 |
| Avg Max Temp (°F) | 35 | 38 | 47 | 59 | 70 | 79 | 84 | 82 | 74 | 63 | 51 | 40 | 60 |
| Avg Precip (In.) | 3.95 | 2.92 | 3.93 | 4.15 | 4.27 | 4.12 | 4.06 | 4.09 | 4.14 | 4.19 | 4.13 | 3.72 | 47.67 |