Dillard, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.2 °C (low) to 19.5 °C (high). Annual precipitation averages 878.1 Millimeters. Dillard is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.9 °C | 9.7 °C | 124.97 mm |
| February | 2.1 °C | 12.2 °C | 108.97 mm |
| March | 3 °C | 14.9 °C | 98.04 mm |
| April | 4.6 °C | 18 °C | 65.79 mm |
| May | 7.4 °C | 22.1 °C | 50.29 mm |
| June | 9.9 °C | 25.6 °C | 25.4 mm |
| July | 12.4 °C | 30.4 °C | 5.84 mm |
| August | 11.9 °C | 30.7 °C | 8.38 mm |
| September | 9.2 °C | 27.7 °C | 22.86 mm |
| October | 5.9 °C | 20.7 °C | 61.47 mm |
| November | 4.1 °C | 12.7 °C | 130.56 mm |
| December | 1.9 °C | 8.8 °C | 175.51 mm |
| Annual | 6.2 °C | 19.5 °C | 878.08 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 30-40 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 | Severe Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |