Melrose, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.2 °F (low) to 60.4 °F (high). Annual precipitation averages 38.3 Inches. Melrose 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 | 13.2 °F | 31.1 °F | 1.13 in. |
| February | 17.3 °F | 35.7 °F | 1.49 in. |
| March | 27.9 °F | 49.0 °F | 2.21 in. |
| April | 39.3 °F | 61.6 °F | 3.96 in. |
| May | 51.1 °F | 71.5 °F | 5.35 in. |
| June | 61.3 °F | 81.3 °F | 5.35 in. |
| July | 64.9 °F | 85.2 °F | 4.43 in. |
| August | 62.7 °F | 83.4 °F | 4.28 in. |
| September | 53.8 °F | 76.4 °F | 3.72 in. |
| October | 41.6 °F | 63.9 °F | 2.88 in. |
| November | 29.5 °F | 48.6 °F | 2.07 in. |
| December | 19.3 °F | 36.5 °F | 1.44 in. |
| Annual | 40.2 °F | 60.4 °F | 38.31 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |