Rothesay, New Brunswick climate data is summarized below. Average annual temperatures range from 35.2 °F (low) to 51.1 °F (high). Annual precipitation averages 35 Inches. Rothesay is located in USDA Plant Hardiness Zone 5b. 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 | -24 °F | -18.9 °F | 609.6 in. |
| February | -24 °F | -18.6 °F | 482.6 in. |
| March | -21.5 °F | -16.3 °F | 1193.8 in. |
| April | -17.8 °F | -12.8 °F | 1930.4 in. |
| May | -14.8 °F | -9.7 °F | 2159 in. |
| June | -12.3 °F | -7.3 °F | 2794 in. |
| July | -10.5 °F | -5.6 °F | 2184.4 in. |
| August | -10.4 °F | -5.5 °F | 1930.4 in. |
| September | -12.4 °F | -7.5 °F | 2133.6 in. |
| October | -15.1 °F | -10.3 °F | 2667 in. |
| November | -17.8 °F | -13.5 °F | 2717.8 in. |
| December | -21.2 °F | -16.7 °F | 1803.4 in. |
| Annual | 35.2 °F | 51.1 °F | 35.04 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 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |