Chatsworth, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.4 °C (low) to 14.8 °C (high). Annual precipitation averages 743 Millimeters. Chatsworth 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 | -13.1 °C | -2.3 °C | 16.76 mm |
| February | -10.8 °C | 0.4 °C | 19.56 mm |
| March | -4.5 °C | 7.6 °C | 42.67 mm |
| April | 1.8 °C | 15.4 °C | 78.23 mm |
| May | 8.6 °C | 21.7 °C | 104.65 mm |
| June | 14.9 °C | 27.3 °C | 116.08 mm |
| July | 17.1 °C | 29.5 °C | 83.31 mm |
| August | 15.6 °C | 28.3 °C | 83.06 mm |
| September | 10.2 °C | 24.6 °C | 76.45 mm |
| October | 2.9 °C | 17 °C | 63.25 mm |
| November | -4.3 °C | 7.8 °C | 34.04 mm |
| December | -10.2 °C | 0.1 °C | 24.89 mm |
| Annual | 2.4 °C | 14.8 °C | 742.95 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 |