Meacham, Oregon has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 0.4 °C (low) to 13.3 °C (high). Annual precipitation averages 879.6 Millimeters. Meacham is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around July 21 - July 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.6 °C | 2.6 °C | 109.73 mm |
| February | -5 °C | 4.4 °C | 76.2 mm |
| March | -3.3 °C | 7.7 °C | 87.12 mm |
| April | -1.3 °C | 11.5 °C | 89.15 mm |
| May | 2.1 °C | 16.2 °C | 97.28 mm |
| June | 4.8 °C | 20.2 °C | 59.94 mm |
| July | 8.1 °C | 26.5 °C | 18.03 mm |
| August | 8.1 °C | 26.7 °C | 20.32 mm |
| September | 4.9 °C | 21.7 °C | 32.26 mm |
| October | 0.6 °C | 14.1 °C | 66.8 mm |
| November | -2.7 °C | 6.3 °C | 108.46 mm |
| December | -5.9 °C | 1.8 °C | 114.3 mm |
| Annual | 0.4 °C | 13.3 °C | 879.59 mm |
| Average First Frost Date | July 21 - July 31 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |