| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F |
| 2012 Hardiness Zone: | Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 3b: -35F to -30F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 51h - St. Croix Outwash Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 55040 - Isanti, MN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 0 | 7 | 20 | 33 | 45 | 54 | 59 | 57 | 47 | 36 | 22 | 7 | 32 |
| Avg Max Temp (°F) | 20 | 27 | 39 | 56 | 70 | 77 | 81 | 79 | 69 | 57 | 38 | 25 | 53 |
| Avg Precip (In.) | .95 | .69 | 1.49 | 2.18 | 3.23 | 4.43 | 4.18 | 4.25 | 3.12 | 2.34 | 1.86 | .86 | 29.59 |