Wheeler, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7 °C (low) to 14.7 °C (high). Annual precipitation averages 2375.2 Millimeters. Wheeler is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.9 °C | 10 °C | 354.84 mm |
| February | 3.6 °C | 10.7 °C | 242.32 mm |
| March | 4.1 °C | 11.7 °C | 270.76 mm |
| April | 5.4 °C | 13.5 °C | 201.93 mm |
| May | 7.7 °C | 15.7 °C | 116.08 mm |
| June | 9.9 °C | 17.4 °C | 92.2 mm |
| July | 11.4 °C | 19.4 °C | 26.92 mm |
| August | 11.6 °C | 20.1 °C | 43.69 mm |
| September | 10.1 °C | 19.6 °C | 85.34 mm |
| October | 7.6 °C | 16.2 °C | 208.03 mm |
| November | 5.4 °C | 12.2 °C | 363.98 mm |
| December | 3.7 °C | 9.6 °C | 369.06 mm |
| Annual | 7 °C | 14.7 °C | 2375.15 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°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 |