Clontarf, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.3 °F (low) to 53.9 °F (high). Annual precipitation averages 26.8 Inches. Clontarf is located in USDA Plant Hardiness Zone 4b. 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 | 2.8 °F | 21.0 °F | 0.64 in. |
| February | 6.0 °F | 25.6 °F | 0.66 in. |
| March | 19.3 °F | 38.2 °F | 1.3 in. |
| April | 32.7 °F | 54.7 °F | 2.38 in. |
| May | 45.8 °F | 68.4 °F | 3.21 in. |
| June | 57.0 °F | 78.1 °F | 4.15 in. |
| July | 60.6 °F | 82.0 °F | 4.03 in. |
| August | 57.5 °F | 80.0 °F | 3.62 in. |
| September | 49.0 °F | 73.1 °F | 2.63 in. |
| October | 35.9 °F | 58.2 °F | 2.34 in. |
| November | 22.5 °F | 40.9 °F | 1.08 in. |
| December | 9.9 °F | 26.7 °F | 0.74 in. |
| Annual | 33.3 °F | 53.9 °F | 26.78 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |