Harcourt, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.5 °F (low) to 57.8 °F (high). Annual precipitation averages 35.6 Inches. Harcourt is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.6 °F | 27.0 °F | 0.9 in. |
| February | 13.5 °F | 31.5 °F | 1.13 in. |
| March | 25.2 °F | 44.9 °F | 2.03 in. |
| April | 36.3 °F | 59.4 °F | 3.74 in. |
| May | 48.9 °F | 70.3 °F | 5.03 in. |
| June | 59.8 °F | 80.2 °F | 5.33 in. |
| July | 63.3 °F | 83.2 °F | 4.23 in. |
| August | 60.8 °F | 81.0 °F | 4.37 in. |
| September | 51.7 °F | 75.2 °F | 3.2 in. |
| October | 39.2 °F | 62.2 °F | 2.62 in. |
| November | 26.5 °F | 46.0 °F | 1.71 in. |
| December | 15.7 °F | 32.4 °F | 1.35 in. |
| Annual | 37.5 °F | 57.8 °F | 35.64 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |