Greenwich, Kansas has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.4 °C (low) to 19.5 °C (high). Annual precipitation averages 897.4 Millimeters. Greenwich is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.8 °C | 5.7 °C | 22.35 mm |
| February | -4.2 °C | 8.2 °C | 35.05 mm |
| March | 1.1 °C | 14.1 °C | 63.25 mm |
| April | 6.4 °C | 19.2 °C | 81.53 mm |
| May | 12.6 °C | 24.1 °C | 138.43 mm |
| June | 18.2 °C | 29.8 °C | 130.3 mm |
| July | 20.5 °C | 32.5 °C | 99.31 mm |
| August | 19.5 °C | 31.7 °C | 100.84 mm |
| September | 14.9 °C | 27.6 °C | 77.47 mm |
| October | 7.9 °C | 20.9 °C | 74.93 mm |
| November | 1.2 °C | 13.4 °C | 42.16 mm |
| December | -4.1 °C | 6.8 °C | 31.75 mm |
| Annual | 7.4 °C | 19.5 °C | 897.37 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |