Maple Falls, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 40.6 °F (low) to 57.3 °F (high). Annual precipitation averages 66.9 Inches. 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 | 30.4 °F | 40.5 °F | 9.02 in. |
| February | 31.7 °F | 44.6 °F | 5.37 in. |
| March | 33.9 °F | 49.9 °F | 6.94 in. |
| April | 38.0 °F | 56.8 °F | 4.9 in. |
| May | 43.7 °F | 64.0 °F | 4.14 in. |
| June | 49.0 °F | 67.9 °F | 3.31 in. |
| July | 52.8 °F | 75.2 °F | 1.87 in. |
| August | 52.8 °F | 75.8 °F | 1.97 in. |
| September | 47.6 °F | 68.9 °F | 3.5 in. |
| October | 41.4 °F | 57.7 °F | 6.86 in. |
| November | 35.1 °F | 46.4 °F | 10.6 in. |
| December | 30.5 °F | 39.9 °F | 8.38 in. |
| Annual | 40.6 °F | 57.3 °F | 66.86 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |