Maple Falls, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 4.8 °C (low) to 14.1 °C (high). Annual precipitation averages 1698.3 Millimeters. Maple Falls is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.9 °C | 4.7 °C | 229.11 mm |
| February | -0.2 °C | 7 °C | 136.4 mm |
| March | 1.1 °C | 9.9 °C | 176.28 mm |
| April | 3.3 °C | 13.8 °C | 124.46 mm |
| May | 6.5 °C | 17.8 °C | 105.16 mm |
| June | 9.4 °C | 19.9 °C | 84.07 mm |
| July | 11.6 °C | 24 °C | 47.5 mm |
| August | 11.6 °C | 24.3 °C | 50.04 mm |
| September | 8.7 °C | 20.5 °C | 88.9 mm |
| October | 5.2 °C | 14.3 °C | 174.24 mm |
| November | 1.7 °C | 8 °C | 269.24 mm |
| December | -0.8 °C | 4.4 °C | 212.85 mm |
| Annual | 4.8 °C | 14.1 °C | 1698.25 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |