Rochester, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.7 °F (low) to 59.7 °F (high). Annual precipitation averages 37.8 Inches. Rochester is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.0 °F | 29.6 °F | 1.34 in. |
| February | 16.7 °F | 34.1 °F | 1.58 in. |
| March | 27.7 °F | 47.2 °F | 2.35 in. |
| April | 38.8 °F | 61.2 °F | 3.71 in. |
| May | 50.8 °F | 72.1 °F | 4.73 in. |
| June | 60.8 °F | 81.4 °F | 5.12 in. |
| July | 64.1 °F | 84.4 °F | 4.27 in. |
| August | 61.6 °F | 82.7 °F | 4.19 in. |
| September | 53.2 °F | 76.9 °F | 3.59 in. |
| October | 41.3 °F | 63.8 °F | 2.96 in. |
| November | 29.5 °F | 48.4 °F | 2.22 in. |
| December | 19.1 °F | 35.1 °F | 1.77 in. |
| Annual | 39.7 °F | 59.7 °F | 37.83 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |