Valentine, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.4 °F (low) to 60.8 °F (high). Annual precipitation averages 21.3 Inches. 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 | 12.0 °F | 34.6 °F | 0.36 in. |
| February | 14.6 °F | 38.2 °F | 0.58 in. |
| March | 23.3 °F | 48.4 °F | 1.03 in. |
| April | 33.0 °F | 58.4 °F | 2.41 in. |
| May | 44.6 °F | 69.4 °F | 3.78 in. |
| June | 55.4 °F | 80.4 °F | 3.79 in. |
| July | 61.3 °F | 88.1 °F | 3.1 in. |
| August | 58.8 °F | 86.3 °F | 2.13 in. |
| September | 49.1 °F | 77.9 °F | 1.79 in. |
| October | 35.3 °F | 62.6 °F | 1.35 in. |
| November | 23.4 °F | 48.2 °F | 0.56 in. |
| December | 14.5 °F | 36.8 °F | 0.44 in. |
| Annual | 35.4 °F | 60.8 °F | 21.32 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |