McGrew, Nebraska has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 34.7 °F (low) to 64 °F (high). Annual precipitation averages 15.5 Inches. McGrew is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.2 °F | 40.4 °F | 0.28 in. |
| February | 16.6 °F | 43.6 °F | 0.43 in. |
| March | 24.6 °F | 53.5 °F | 0.78 in. |
| April | 32.5 °F | 61.3 °F | 1.72 in. |
| May | 43.1 °F | 71.0 °F | 2.89 in. |
| June | 53.3 °F | 83.0 °F | 2.72 in. |
| July | 59.4 °F | 90.2 °F | 1.8 in. |
| August | 57.0 °F | 88.3 °F | 1.43 in. |
| September | 46.8 °F | 79.6 °F | 1.44 in. |
| October | 33.3 °F | 64.7 °F | 1.12 in. |
| November | 22.1 °F | 51.3 °F | 0.49 in. |
| December | 13.6 °F | 40.7 °F | 0.39 in. |
| Annual | 34.7 °F | 64 °F | 15.49 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Exceptional Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |