Rothesay, New Brunswick climate data is summarized below. Average annual temperatures range from 1.7 °C (low) to 10.6 °C (high). Annual precipitation averages 890 Millimeters. 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 | -11.12 °C | -1.96 °C | 24 mm |
| February | -11.16 °C | -1.47 °C | 19 mm |
| March | -6.7 °C | 2.65 °C | 47 mm |
| April | -0.09 °C | 9 °C | 76 mm |
| May | 5.42 °C | 14.51 °C | 85 mm |
| June | 9.87 °C | 18.8 °C | 110 mm |
| July | 13.12 °C | 22.01 °C | 86 mm |
| August | 13.25 °C | 22.04 °C | 76 mm |
| September | 9.64 °C | 18.59 °C | 84 mm |
| October | 4.83 °C | 13.47 °C | 105 mm |
| November | -0.01 °C | 7.77 °C | 107 mm |
| December | -6.1 °C | 1.86 °C | 71 mm |
| Annual | 1.7 °C | 10.6 °C | 890 mm |
| 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 : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |