Last updated: June 18, 2025
In Smiths Falls, Canada, the average temperature in December is a chilly -4°C (25°F). During this time, temperatures can plummet to a minimum of -29°C (-20°F) or soar to a pleasant 15°C (59°F). Expect 77 mm (3.0 in) of precipitation spread over 11 days, contributing to an average humidity of 89%. Stay warm and prepared for the elements!
In December in Smiths Falls, the average temperature is -4°C (25°F). Maximum temperatures can reach as high as 15°C (59°F), while the minimum can drop to a chilling -29°C (-20°F). Travelers should be prepared for a wide range of temperatures during this month, ensuring they have appropriate clothing for both mild and extremely cold conditions.
In Smiths Falls in December, the precipitation amount is 77 mm (3.0 in) over the course of 11 days.
In Smiths Falls in December humidity is 89%. With an average temperature of -4°C (25°F), this humidity feels like an intense chill that seeps into your bones, making traveling uncomfortable as you navigate through the damp, cold air.
In Smiths Falls 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 Smiths Falls, you can visit Hourly UV Index in Smiths Falls.
UV Risk Categories
Weather in Smiths Falls varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Smiths Falls, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (19°F) | 73 mm (2.9 inches) | 93% | low |
| February Weather | -6°C (21°F) | 74 mm (2.9 inches) | 93% | moderate |
| March Weather | -2°C (29°F) | 77 mm (3.0 inches) | 86% | moderate |
| April Weather | 6°C (43°F) | 116 mm (4.6 inches) | 82% | very high |
| May Weather | 13°C (55°F) | 103 mm (4.1 inches) | 75% | very high |
| June Weather | 18°C (64°F) | 87 mm (3.4 inches) | 68% | very high |
| July Weather | 22°C (71°F) | 113 mm (4.4 inches) | 69% | very high |
| August Weather | 20°C (69°F) | 91 mm (3.6 inches) | 67% | very high |
| September Weather | 16°C (62°F) | 57 mm (2.2 inches) | 72% | high |
| October Weather | 10°C (50°F) | 130 mm (5.1 inches) | 83% | moderate |
| November Weather | 2°C (35°F) | 91 mm (3.6 inches) | 88% | moderate |
| December Weather | -4°C (25°F) | 77 mm (3.0 inches) | 89% | low |