Blair, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.2 °C (low) to 16.1 °C (high). Annual precipitation averages 813.8 Millimeters. Blair is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.8 °C | -0.3 °C | 19.05 mm |
| February | -8.7 °C | 2.4 °C | 23.37 mm |
| March | -2.7 °C | 9.6 °C | 47.5 mm |
| April | 3.5 °C | 16.7 °C | 84.07 mm |
| May | 10.4 °C | 22.6 °C | 118.36 mm |
| June | 16.4 °C | 28.1 °C | 127.76 mm |
| July | 18.5 °C | 29.9 °C | 87.12 mm |
| August | 17 °C | 28.8 °C | 93.73 mm |
| September | 11.8 °C | 25.4 °C | 85.09 mm |
| October | 4.8 °C | 18.2 °C | 59.69 mm |
| November | -2.3 °C | 9.6 °C | 35.56 mm |
| December | -7.9 °C | 2.1 °C | 32.51 mm |
| Annual | 4.2 °C | 16.1 °C | 813.81 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |