Last updated: June 18, 2025
In December, the average temperature in Moncton, Canada hovers around -3°C (26°F), with potential extremes reaching a frigid -22°C (-7°F) at night and a balmy 15°C (59°F) during the day. Expect about 103 mm (4.0 in) of precipitation over 12 days, contributing to an average humidity level of 83%. Stay prepared for a variety of weather conditions!
In December in Moncton, the average temperature is -3°C (26°F), with maximums reaching 15°C (59°F) and minimums dropping as low as -22°C (-7°F). Travelers should be prepared for a wide range of temperatures and dress accordingly for both cold and mild conditions.
In Moncton in December, the precipitation amount is 103 mm (4.0 in) recorded over a span of 12 days.
In Moncton in December, humidity is 83%. With an average temperature of -3°C (26°F), this humidity feels like a heavy blanket of cold air enveloping you, making it challenging to stay warm while traveling. The dampness seeps into your clothing, creating an uncomfortable chill that lingers even indoors, often requiring extra layers and careful planning for outdoor activities.
In Moncton in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Moncton, you can visit Hourly UV Index in Moncton.
UV Risk Categories
Weather in Moncton varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Moncton, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 92 mm (3.6 inches) | 82% | low |
| February Weather | -6°C (22°F) | 101 mm (4.0 inches) | 83% | moderate |
| March Weather | -2°C (28°F) | 78 mm (3.1 inches) | 82% | moderate |
| April Weather | 4°C (40°F) | 91 mm (3.6 inches) | 82% | high |
| May Weather | 10°C (50°F) | 104 mm (4.1 inches) | 82% | very high |
| June Weather | 16°C (60°F) | 97 mm (3.8 inches) | 84% | very high |
| July Weather | 19°C (67°F) | 82 mm (3.2 inches) | 86% | very high |
| August Weather | 19°C (67°F) | 72 mm (2.8 inches) | 85% | very high |
| September Weather | 15°C (59°F) | 90 mm (3.5 inches) | 83% | high |
| October Weather | 9°C (48°F) | 80 mm (3.2 inches) | 83% | moderate |
| November Weather | 2°C (37°F) | 145 mm (5.7 inches) | 85% | moderate |
| December Weather | -3°C (26°F) | 103 mm (4.0 inches) | 83% | low |