Last updated: June 18, 2025
In December, the average temperature in Mattawa, Canada hovers around -7°C (19°F), making it quite a chilly time of year. During this month, temperatures can swing dramatically, with a minimum of -34°C (-28°F) and a maximum reaching up to 16°C (60°F). Expect about 76 mm (3.0 in) of precipitation over approximately 14 days, contributing to a notably high average humidity of 94%. Bundle up and be prepared for a mix of wintery weather!
In December in Mattawa, the average temperature is -7°C (19°F), with maximums reaching 16°C (60°F) and minimums dropping as low as -34°C (-28°F). Travelers should be prepared for a wide range of temperatures and dress accordingly to enjoy their visit.
In Mattawa in December, the precipitation amount is 76 mm (3.0 in) spread over 14 days.
In Mattawa in December, humidity is 94%. With an average temperature of -7°C (19°F), this humidity feels like a biting chill that seeps through your layers, making travel uncomfortable and the air feel damp and heavy, as if every breath carries the weight of the cold moisture.
In Mattawa 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 Mattawa, you can visit Hourly UV Index in Mattawa.
UV Risk Categories
Weather in Mattawa varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Mattawa, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -11°C (13°F) | 55 mm (2.2 inches) | 96% | low |
| February Weather | -10°C (15°F) | 66 mm (2.6 inches) | 95% | moderate |
| March Weather | -4°C (24°F) | 61 mm (2.4 inches) | 89% | moderate |
| April Weather | 3°C (38°F) | 99 mm (3.9 inches) | 85% | high |
| May Weather | 11°C (53°F) | 103 mm (4.1 inches) | 74% | very high |
| June Weather | 17°C (62°F) | 106 mm (4.2 inches) | 67% | very high |
| July Weather | 20°C (68°F) | 95 mm (3.7 inches) | 71% | very high |
| August Weather | 18°C (65°F) | 116 mm (4.6 inches) | 71% | very high |
| September Weather | 14°C (57°F) | 105 mm (4.2 inches) | 76% | high |
| October Weather | 7°C (46°F) | 103 mm (4.0 inches) | 86% | moderate |
| November Weather | -1°C (31°F) | 86 mm (3.4 inches) | 90% | moderate |
| December Weather | -7°C (19°F) | 76 mm (3.0 inches) | 94% | low |