Montrose, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.2 °F (low) to 62 °F (high). Annual precipitation averages 39.5 Inches. Montrose is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.2 °F | 33.6 °F | 1.66 in. |
| February | 20.8 °F | 38.0 °F | 1.88 in. |
| March | 31.2 °F | 50.1 °F | 2.56 in. |
| April | 42.2 °F | 63.1 °F | 3.88 in. |
| May | 53.6 °F | 73.2 °F | 5.24 in. |
| June | 63.5 °F | 82.3 °F | 5.0 in. |
| July | 67.3 °F | 86.1 °F | 4.18 in. |
| August | 65.1 °F | 84.6 °F | 3.81 in. |
| September | 56.6 °F | 78.1 °F | 3.69 in. |
| October | 44.8 °F | 65.5 °F | 3.12 in. |
| November | 33.2 °F | 51.2 °F | 2.53 in. |
| December | 22.9 °F | 38.4 °F | 1.93 in. |
| Annual | 43.2 °F | 62 °F | 39.48 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |