Noonan, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.2 °C (low) to 10 °C (high). Annual precipitation averages 432 Millimeters. Noonan is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -18.3 °C | -8.2 °C | 13.46 mm |
| February | -16.3 °C | -5.7 °C | 10.92 mm |
| March | -9.7 °C | 0.9 °C | 16.76 mm |
| April | -2.3 °C | 11.1 °C | 24.89 mm |
| May | 4.4 °C | 18.2 °C | 61.72 mm |
| June | 10.3 °C | 22.7 °C | 90.93 mm |
| July | 12.6 °C | 26.2 °C | 69.6 mm |
| August | 11.3 °C | 26.6 °C | 42.67 mm |
| September | 6.1 °C | 20.8 °C | 39.88 mm |
| October | -0.9 °C | 11.7 °C | 30.48 mm |
| November | -8.5 °C | 1.4 °C | 16.76 mm |
| December | -15.2 °C | -5.4 °C | 13.97 mm |
| Annual | -2.2 °C | 10 °C | 432.04 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |