Port Hope Simpson, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from -2.5 °C (low) to 4.4 °C (high). Annual precipitation averages 549 Millimeters. Port Hope Simpson is located in USDA Plant Hardiness Zone 3a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.88 °C | -8.18 °C | 14 mm |
| February | -15.78 °C | -7.41 °C | 6 mm |
| March | -11.46 °C | -4.39 °C | 14 mm |
| April | -5.43 °C | 0.24 °C | 22 mm |
| May | -0.32 °C | 6.5 °C | 52 mm |
| June | 5.04 °C | 13.21 °C | 59 mm |
| July | 9.55 °C | 18.24 °C | 75 mm |
| August | 10.07 °C | 18.36 °C | 60 mm |
| September | 6.06 °C | 13.27 °C | 71 mm |
| October | 1.65 °C | 6.73 °C | 89 mm |
| November | -3.66 °C | 0.86 °C | 55 mm |
| December | -10.42 °C | -4.64 °C | 32 mm |
| Annual | -2.5 °C | 4.4 °C | 549 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3a : -40°C to -37.2°C |
| Current Drought Conditions | Normal |