Mapleton, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.8 °C (low) to 17.4 °C (high). Annual precipitation averages 2239.3 Millimeters. 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 | 3.7 °C | 10.6 °C | 350.01 mm |
| February | 3.7 °C | 12.2 °C | 263.14 mm |
| March | 4.3 °C | 13.5 °C | 270 mm |
| April | 5.4 °C | 16.2 °C | 180.59 mm |
| May | 7.5 °C | 19.1 °C | 120.14 mm |
| June | 9.2 °C | 21.6 °C | 64.52 mm |
| July | 11 °C | 25.4 °C | 11.18 mm |
| August | 11.1 °C | 25.9 °C | 20.07 mm |
| September | 9.5 °C | 23.9 °C | 54.36 mm |
| October | 7.3 °C | 18.3 °C | 162.05 mm |
| November | 5.1 °C | 12.8 °C | 332.99 mm |
| December | 3.3 °C | 9.8 °C | 410.21 mm |
| Annual | 6.8 °C | 17.4 °C | 2239.26 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |