Arthur, Nebraska has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 35.4 °F (low) to 62.3 °F (high). Annual precipitation averages 19.7 Inches. Arthur 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 | 14.0 °F | 38.1 °F | 0.37 in. |
| February | 16.2 °F | 40.9 °F | 0.44 in. |
| March | 24.6 °F | 51.6 °F | 1.08 in. |
| April | 33.1 °F | 60.3 °F | 2.25 in. |
| May | 43.8 °F | 70.2 °F | 3.1 in. |
| June | 54.2 °F | 81.7 °F | 3.06 in. |
| July | 60.0 °F | 88.1 °F | 3.36 in. |
| August | 57.9 °F | 86.0 °F | 1.9 in. |
| September | 48.2 °F | 77.8 °F | 1.83 in. |
| October | 34.6 °F | 63.5 °F | 1.49 in. |
| November | 23.4 °F | 50.0 °F | 0.49 in. |
| December | 15.1 °F | 38.9 °F | 0.29 in. |
| Annual | 35.4 °F | 62.3 °F | 19.66 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 |