Orleans, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.1 °C (low) to 13 °C (high). Annual precipitation averages 767.1 Millimeters. 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 | -13.9 °C | -4.6 °C | 17.53 mm |
| February | -11.8 °C | -2.2 °C | 19.81 mm |
| March | -5.2 °C | 4.8 °C | 40.13 mm |
| April | 1.6 °C | 13.6 °C | 81.03 mm |
| May | 8.6 °C | 20.4 °C | 111.76 mm |
| June | 14.7 °C | 26 °C | 118.62 mm |
| July | 16.8 °C | 28.3 °C | 90.17 mm |
| August | 15.3 °C | 26.7 °C | 92.71 mm |
| September | 10.6 °C | 23.4 °C | 80.01 mm |
| October | 3.2 °C | 15.4 °C | 57.91 mm |
| November | -4.1 °C | 6.1 °C | 33.78 mm |
| December | -10.6 °C | -1.8 °C | 23.62 mm |
| Annual | 2.1 °C | 13 °C | 767.08 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |