Stockton, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.4 °F (low) to 59.7 °F (high). Annual precipitation averages 38 Inches. Stockton is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.8 °F | 30.1 °F | 1.41 in. |
| February | 17.3 °F | 34.5 °F | 1.68 in. |
| March | 28.2 °F | 47.4 °F | 2.44 in. |
| April | 39.3 °F | 60.8 °F | 3.72 in. |
| May | 51.2 °F | 71.8 °F | 4.81 in. |
| June | 61.1 °F | 81.1 °F | 5.0 in. |
| July | 64.7 °F | 84.2 °F | 4.23 in. |
| August | 62.4 °F | 82.4 °F | 4.07 in. |
| September | 54.2 °F | 76.6 °F | 3.59 in. |
| October | 42.3 °F | 63.5 °F | 2.9 in. |
| November | 30.4 °F | 48.5 °F | 2.22 in. |
| December | 19.9 °F | 35.4 °F | 1.88 in. |
| Annual | 40.4 °F | 59.7 °F | 37.95 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |