Phelps, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.3 °F (low) to 51.1 °F (high). Annual precipitation averages 32.7 Inches. Phelps is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.0 °F | 21.7 °F | 1.33 in. |
| February | 4.6 °F | 26.8 °F | 1.11 in. |
| March | 14.0 °F | 38.2 °F | 1.63 in. |
| April | 27.5 °F | 50.1 °F | 2.79 in. |
| May | 40.8 °F | 64.3 °F | 3.44 in. |
| June | 50.9 °F | 73.6 °F | 4.03 in. |
| July | 55.1 °F | 77.5 °F | 4.15 in. |
| August | 53.3 °F | 75.6 °F | 3.45 in. |
| September | 45.6 °F | 67.5 °F | 3.73 in. |
| October | 33.9 °F | 53.1 °F | 3.35 in. |
| November | 22.6 °F | 38.0 °F | 1.98 in. |
| December | 10.7 °F | 26.3 °F | 1.66 in. |
| Annual | 30.3 °F | 51.1 °F | 32.65 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |