| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 51a - St. Croix Outwash Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 55109 - Saint Paul, MN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 4 | 11 | 23 | 35 | 48 | 57 | 62 | 60 | 50 | 39 | 25 | 11 | 35 |
| Avg Max Temp (°F) | 22 | 29 | 41 | 57 | 70 | 78 | 83 | 80 | 71 | 59 | 40 | 26 | 55 |
| Avg Precip (In.) | 1 | .76 | 1.88 | 2.57 | 3.6 | 4.79 | 4.35 | 4.38 | 3.21 | 2.46 | 2.06 | .99 | 32.06 |