Monument, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 2.7 °C (low) to 19 °C (high). Annual precipitation averages 331.5 Millimeters. Monument is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.5 °C | 7 °C | 34.8 mm |
| February | -2.9 °C | 9.6 °C | 25.4 mm |
| March | -0.6 °C | 13.6 °C | 36.83 mm |
| April | 1.8 °C | 17.4 °C | 32.51 mm |
| May | 5.2 °C | 22.4 °C | 41.66 mm |
| June | 8.6 °C | 26.9 °C | 32 mm |
| July | 11.4 °C | 33.1 °C | 10.92 mm |
| August | 10.1 °C | 32.9 °C | 9.91 mm |
| September | 6.4 °C | 27.8 °C | 11.18 mm |
| October | 1.7 °C | 19.8 °C | 24.64 mm |
| November | -1.3 °C | 11.2 °C | 32.51 mm |
| December | -4 °C | 6.2 °C | 39.12 mm |
| Annual | 2.7 °C | 19 °C | 331.48 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |