McAdam, New Brunswick climate data is summarized below. Average annual temperatures range from 32.6 °F (low) to 51.8 °F (high). Annual precipitation averages 34.7 Inches. McAdam is located in USDA Plant Hardiness Zone 5a. 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 | -25.6 °F | -20 °F | 304.8 in. |
| February | -25.2 °F | -19.3 °F | 406.4 in. |
| March | -22.5 °F | -16.6 °F | 1473.2 in. |
| April | -18.5 °F | -12.3 °F | 2133.6 in. |
| May | -15 °F | -8.5 °F | 2286 in. |
| June | -12.2 °F | -5.9 °F | 2133.6 in. |
| July | -10.1 °F | -3.7 °F | 2184.4 in. |
| August | -10.6 °F | -4 °F | 1981.2 in. |
| September | -13.2 °F | -6.6 °F | 2184.4 in. |
| October | -16.1 °F | -10.5 °F | 2819.4 in. |
| November | -19.1 °F | -14.4 °F | 2616.2 in. |
| December | -22.9 °F | -18.2 °F | 1854.2 in. |
| Annual | 32.6 °F | 51.8 °F | 34.69 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Moderate Drought |