Indianola, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.9 °C (low) to 15.9 °C (high). Annual precipitation averages 916.2 Millimeters. Indianola is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.6 °C | 8.3 °C | 132.33 mm |
| February | 2.5 °C | 9.7 °C | 81.28 mm |
| March | 3.7 °C | 11.9 °C | 97.03 mm |
| April | 5.4 °C | 15 °C | 65.79 mm |
| May | 8.2 °C | 18.8 °C | 49.02 mm |
| June | 10.5 °C | 21.2 °C | 44.45 mm |
| July | 12.3 °C | 24.5 °C | 21.59 mm |
| August | 12.4 °C | 24.8 °C | 23.88 mm |
| September | 10.7 °C | 21.6 °C | 37.85 mm |
| October | 7.6 °C | 15.9 °C | 85.6 mm |
| November | 4.4 °C | 10.7 °C | 137.41 mm |
| December | 2.4 °C | 7.8 °C | 139.95 mm |
| Annual | 6.9 °C | 15.9 °C | 916.18 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |