Orleans, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.7 °F (low) to 55.4 °F (high). Annual precipitation averages 30.2 Inches. Orleans is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.9 °F | 23.7 °F | 0.69 in. |
| February | 10.7 °F | 28.0 °F | 0.78 in. |
| March | 22.6 °F | 40.7 °F | 1.58 in. |
| April | 34.8 °F | 56.4 °F | 3.19 in. |
| May | 47.4 °F | 68.7 °F | 4.4 in. |
| June | 58.4 °F | 78.8 °F | 4.67 in. |
| July | 62.2 °F | 82.9 °F | 3.55 in. |
| August | 59.5 °F | 80.1 °F | 3.65 in. |
| September | 51.1 °F | 74.1 °F | 3.15 in. |
| October | 37.7 °F | 59.8 °F | 2.28 in. |
| November | 24.7 °F | 43.0 °F | 1.33 in. |
| December | 12.9 °F | 28.8 °F | 0.93 in. |
| Annual | 35.7 °F | 55.4 °F | 30.2 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |