Stanhope, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.6 °F (low) to 58 °F (high). Annual precipitation averages 36.4 Inches. Stanhope 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 | 0.97 in. |
| February | 13.7 °F | 31.6 °F | 1.13 in. |
| March | 25.4 °F | 44.7 °F | 2.08 in. |
| April | 36.5 °F | 59.5 °F | 3.76 in. |
| May | 49.2 °F | 70.7 °F | 4.98 in. |
| June | 59.8 °F | 80.5 °F | 5.53 in. |
| July | 63.1 °F | 83.5 °F | 4.39 in. |
| August | 60.4 °F | 81.2 °F | 4.49 in. |
| September | 51.4 °F | 75.7 °F | 3.26 in. |
| October | 38.9 °F | 62.5 °F | 2.64 in. |
| November | 26.7 °F | 46.2 °F | 1.75 in. |
| December | 15.9 °F | 32.6 °F | 1.43 in. |
| Annual | 37.6 °F | 58 °F | 36.41 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 |