Mapleton, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44.2 °F (low) to 63.4 °F (high). Annual precipitation averages 88.2 Inches. Mapleton 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. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.6 °F | 51.0 °F | 13.78 in. |
| February | 38.6 °F | 53.9 °F | 10.36 in. |
| March | 39.8 °F | 56.3 °F | 10.63 in. |
| April | 41.8 °F | 61.1 °F | 7.11 in. |
| May | 45.5 °F | 66.4 °F | 4.73 in. |
| June | 48.6 °F | 70.8 °F | 2.54 in. |
| July | 51.8 °F | 77.7 °F | 0.44 in. |
| August | 51.9 °F | 78.6 °F | 0.79 in. |
| September | 49.1 °F | 75.1 °F | 2.14 in. |
| October | 45.2 °F | 64.9 °F | 6.38 in. |
| November | 41.2 °F | 55.1 °F | 13.11 in. |
| December | 37.9 °F | 49.6 °F | 16.15 in. |
| Annual | 44.2 °F | 63.4 °F | 88.16 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |