Valentine, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.9 °C (low) to 16 °C (high). Annual precipitation averages 541.5 Millimeters. Valentine is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.1 °C | 1.4 °C | 9.14 mm |
| February | -9.7 °C | 3.4 °C | 14.73 mm |
| March | -4.8 °C | 9.1 °C | 26.16 mm |
| April | 0.6 °C | 14.7 °C | 61.21 mm |
| May | 7 °C | 20.8 °C | 96.01 mm |
| June | 13 °C | 26.9 °C | 96.27 mm |
| July | 16.3 °C | 31.2 °C | 78.74 mm |
| August | 14.9 °C | 30.2 °C | 54.1 mm |
| September | 9.5 °C | 25.5 °C | 45.47 mm |
| October | 1.8 °C | 17 °C | 34.29 mm |
| November | -4.8 °C | 9 °C | 14.22 mm |
| December | -9.7 °C | 2.7 °C | 11.18 mm |
| Annual | 1.9 °C | 16 °C | 541.52 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |