| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F | |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 50a - Lake Superior Lacustrine Clay Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 54880 - Superior, WI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 2 | 8 | 19 | 31 | 40 | 48 | 56 | 57 | 48 | 37 | 24 | 9 | 31 |
| Avg Max Temp (°F) | 20 | 26 | 35 | 47 | 59 | 69 | 76 | 74 | 65 | 53 | 38 | 25 | 49 |
| Avg Precip (In.) | 1.01 | .67 | 1.63 | 1.88 | 2.73 | 3.89 | 4.02 | 3.93 | 3.96 | 2.19 | 1.76 | .89 | 28.56 |