Bristol, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.2 °F (low) to 57.2 °F (high). Annual precipitation averages 36.6 Inches. Bristol is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.4 °F | 29.0 °F | 1.83 in. |
| February | 16.2 °F | 32.8 °F | 1.87 in. |
| March | 25.5 °F | 43.8 °F | 2.22 in. |
| April | 35.8 °F | 56.3 °F | 3.99 in. |
| May | 46.6 °F | 67.8 °F | 4.29 in. |
| June | 56.7 °F | 77.7 °F | 4.39 in. |
| July | 61.5 °F | 82.1 °F | 3.54 in. |
| August | 59.9 °F | 80.6 °F | 3.42 in. |
| September | 52.1 °F | 74.0 °F | 3.57 in. |
| October | 40.7 °F | 60.8 °F | 3.01 in. |
| November | 29.9 °F | 46.7 °F | 2.42 in. |
| December | 19.7 °F | 34.3 °F | 2.06 in. |
| Annual | 38.2 °F | 57.2 °F | 36.61 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |