Ayr, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.8 °C (low) to 10.7 °C (high). Annual precipitation averages 572.8 Millimeters. Ayr is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -18.3 °C | -8.4 °C | 13.97 mm |
| February | -16.1 °C | -5.6 °C | 13.72 mm |
| March | -8.9 °C | 1.3 °C | 23.11 mm |
| April | -1.1 °C | 11.2 °C | 28.96 mm |
| May | 6.2 °C | 19.3 °C | 81.79 mm |
| June | 12.6 °C | 24.5 °C | 102.87 mm |
| July | 14.6 °C | 27.2 °C | 87.63 mm |
| August | 13 °C | 26.6 °C | 64.77 mm |
| September | 8 °C | 21.7 °C | 66.8 mm |
| October | 1 °C | 13 °C | 52.07 mm |
| November | -6.9 °C | 3.1 °C | 18.8 mm |
| December | -13.9 °C | -5.1 °C | 18.29 mm |
| Annual | -0.8 °C | 10.7 °C | 572.78 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |