Gardiner, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.8 °C (low) to 16 °C (high). Annual precipitation averages 1788.2 Millimeters. Gardiner is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.7 °C | 11.1 °C | 266.45 mm |
| February | 3.7 °C | 12.2 °C | 209.3 mm |
| March | 4.2 °C | 13.1 °C | 219.96 mm |
| April | 5.3 °C | 14.8 °C | 156.97 mm |
| May | 7.4 °C | 16.9 °C | 97.03 mm |
| June | 9.4 °C | 18.9 °C | 56.9 mm |
| July | 10.9 °C | 20.7 °C | 12.45 mm |
| August | 11 °C | 21.3 °C | 15.49 mm |
| September | 9.8 °C | 20.9 °C | 45.97 mm |
| October | 7.7 °C | 17.8 °C | 130.56 mm |
| November | 5.2 °C | 13.2 °C | 258.83 mm |
| December | 3.4 °C | 10.7 °C | 318.26 mm |
| Annual | 6.8 °C | 16 °C | 1788.17 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Mar. 1 - Mar. 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 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |