Last updated: June 24, 2025
In St Johnsbury, United States, the average temperature in April hovers around 5°C (42°F), offering a cool climate for visitors. Expect temperature fluctuations ranging from a brisk -9°C (16°F) to a warm 25°C (78°F). With an average precipitation of 110 mm (4.3 in) spread across 14 days, staying dry can be a challenge, while the average humidity sits at a notable 84%, adding to the ambiance of the season.
In April in St Johnsbury, the average temperature is 5°C (42°F), with maximums reaching up to 25°C (78°F) and minimums dropping as low as -9°C (16°F). It's essential to pack for a variety of weather conditions, as this time of year can showcase both warmth and chill.
In St Johnsbury in April, the total precipitation amount is 110 mm (4.3 in) spread over 14 days.
In St Johnsbury in April, humidity is 84%. With an average temperature of 5°C (42°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier while traveling.
In St Johnsbury in April, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in St Johnsbury.
UV Risk Categories
Weather in St Johnsbury varies notably across the year, with each month offering distinct climate conditions. This page compares April’s weather to other months in St Johnsbury, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (18°F) | 80 mm (3.1 inches) | 91% | low |
| February Weather | -6°C (21°F) | 78 mm (3.1 inches) | 89% | moderate |
| March Weather | -2°C (29°F) | 69 mm (2.7 inches) | 85% | moderate |
| April Weather | 5°C (42°F) | 110 mm (4.3 inches) | 84% | very high |
| May Weather | 12°C (55°F) | 95 mm (3.7 inches) | 78% | very high |
| June Weather | 17°C (63°F) | 98 mm (3.9 inches) | 72% | very high |
| July Weather | 20°C (69°F) | 106 mm (4.2 inches) | 75% | very high |
| August Weather | 19°C (67°F) | 88 mm (3.5 inches) | 74% | very high |
| September Weather | 15°C (60°F) | 64 mm (2.5 inches) | 77% | high |
| October Weather | 9°C (48°F) | 138 mm (5.5 inches) | 85% | moderate |
| November Weather | 0°C (33°F) | 103 mm (4.0 inches) | 86% | moderate |
| December Weather | -5°C (23°F) | 85 mm (3.3 inches) | 85% | low |