Garrison, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.9 °F (low) to 61.4 °F (high). Annual precipitation averages 29.6 Inches. Garrison 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.9 °F | 32.9 °F | 0.68 in. |
| February | 16.6 °F | 37.6 °F | 0.82 in. |
| March | 26.7 °F | 50.0 °F | 1.56 in. |
| April | 37.2 °F | 61.9 °F | 2.92 in. |
| May | 49.5 °F | 72.7 °F | 4.77 in. |
| June | 60.2 °F | 82.3 °F | 4.69 in. |
| July | 64.6 °F | 86.2 °F | 3.19 in. |
| August | 62.1 °F | 84.1 °F | 3.86 in. |
| September | 52.8 °F | 78.0 °F | 2.66 in. |
| October | 40.0 °F | 65.0 °F | 2.16 in. |
| November | 26.9 °F | 49.5 °F | 1.29 in. |
| December | 16.8 °F | 36.4 °F | 0.99 in. |
| Annual | 38.9 °F | 61.4 °F | 29.59 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |