Algona, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.8 °C (low) to 16.1 °C (high). Annual precipitation averages 1126.5 Millimeters. Algona is located in USDA Plant Hardiness Zone 8b. 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 | 2.1 °C | 8.7 °C | 164.08 mm |
| February | 2.1 °C | 10.2 °C | 102.36 mm |
| March | 3.4 °C | 12.4 °C | 119.13 mm |
| April | 5.3 °C | 15.3 °C | 87.38 mm |
| May | 8.4 °C | 18.9 °C | 56.9 mm |
| June | 11 °C | 21.3 °C | 50.29 mm |
| July | 12.8 °C | 24.7 °C | 20.83 mm |
| August | 12.9 °C | 24.8 °C | 31.75 mm |
| September | 10.6 °C | 21.7 °C | 46.23 mm |
| October | 7.1 °C | 15.9 °C | 112.01 mm |
| November | 4 °C | 11.3 °C | 168.66 mm |
| December | 1.8 °C | 8.2 °C | 166.88 mm |
| Annual | 6.8 °C | 16.1 °C | 1126.5 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 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |