Indianola, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44.4 °F (low) to 60.5 °F (high). Annual precipitation averages 36.1 Inches. 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 | 36.6 °F | 47.0 °F | 5.21 in. |
| February | 36.5 °F | 49.4 °F | 3.2 in. |
| March | 38.7 °F | 53.4 °F | 3.82 in. |
| April | 41.7 °F | 59.0 °F | 2.59 in. |
| May | 46.7 °F | 65.8 °F | 1.93 in. |
| June | 50.9 °F | 70.1 °F | 1.75 in. |
| July | 54.1 °F | 76.1 °F | 0.85 in. |
| August | 54.3 °F | 76.6 °F | 0.94 in. |
| September | 51.2 °F | 70.9 °F | 1.49 in. |
| October | 45.6 °F | 60.7 °F | 3.37 in. |
| November | 39.9 °F | 51.3 °F | 5.41 in. |
| December | 36.4 °F | 46.1 °F | 5.51 in. |
| Annual | 44.4 °F | 60.5 °F | 36.07 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |