Jackson Junction, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2 °C (low) to 13.1 °C (high). Annual precipitation averages 953 Millimeters. Jackson Junction 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 | -13.7 °C | -4.1 °C | 26.16 mm |
| February | -11.6 °C | -1.8 °C | 27.69 mm |
| March | -4.9 °C | 5.6 °C | 51.82 mm |
| April | 1.5 °C | 13.8 °C | 101.09 mm |
| May | 8.2 °C | 20.4 °C | 115.82 mm |
| June | 14.2 °C | 25.7 °C | 150.37 mm |
| July | 15.9 °C | 27.4 °C | 123.95 mm |
| August | 14.6 °C | 26.3 °C | 106.17 mm |
| September | 9.9 °C | 22.9 °C | 96.01 mm |
| October | 3.1 °C | 15.6 °C | 71.37 mm |
| November | -3.6 °C | 6.4 °C | 45.97 mm |
| December | -9.8 °C | -0.9 °C | 36.58 mm |
| Annual | 2 °C | 13.1 °C | 953 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 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |