Granite, Oregon has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from -1.6 °C (low) to 13.1 °C (high). Annual precipitation averages 613.7 Millimeters. Granite is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.9 °C | 1.4 °C | 80.01 mm |
| February | -7.9 °C | 4.1 °C | 59.94 mm |
| March | -5.4 °C | 7.6 °C | 65.28 mm |
| April | -2.7 °C | 10.7 °C | 54.86 mm |
| May | 0.9 °C | 15.9 °C | 60.71 mm |
| June | 3.5 °C | 20.4 °C | 40.64 mm |
| July | 6.8 °C | 27.1 °C | 15.49 mm |
| August | 6.4 °C | 27.3 °C | 14.48 mm |
| September | 2.9 °C | 22.2 °C | 18.8 mm |
| October | -1.3 °C | 14 °C | 43.69 mm |
| November | -4.9 °C | 5.3 °C | 67.82 mm |
| December | -8.8 °C | 0.7 °C | 91.95 mm |
| Annual | -1.6 °C | 13.1 °C | 613.67 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |