Last updated: June 24, 2025
In May, the average temperature in Saint Johnsbury, United States hovers around 12°C (55°F), offering a mild climate for visitors. However, be prepared for temperature fluctuations, as it can dip to a chilly -1°C (30°F) or soar to a warm 32°C (90°F). The region experiences an average precipitation of 95 mm (3.7 in) over 12 days, contributing to a relatively high average humidity of 78%. Whether you're exploring the outdoors or seeking indoor activities, this diverse weather can add a unique twist to your experience!
In May in Saint Johnsbury, the average temperature is 12°C (55°F). The maximum can reach 32°C (90°F), and the minimum can be as low as -1°C (30°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.
In Saint Johnsbury in May, the precipitation amount is 95 mm (3.7 in) over the course of 12 days.
In Saint Johnsbury in May humidity is 78%. With average temperature 12°C (55°F), this humidity feels like a damp chill that wraps around you, making outdoor activities less enjoyable and travel a bit uncomfortable unless you're layered appropriately.
In Saint Johnsbury in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Saint Johnsbury.
UV Risk Categories
Weather in Saint Johnsbury varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Saint 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 |