Last updated: June 18, 2025
In December, the average temperature in Ajax, Canada hovers around 1°C (33°F). Expect chilly days, with a minimum dropping as low as -17°C (2°F) and a maximum reaching up to 12°C (54°F). This month also brings about 96 mm (3.8 in) of precipitation spread over 15 days, contributing to an average humidity of 87%—perfect for cozy sweaters and warm drinks!
In December in Ajax, the average temperature is 1°C (33°F). The maximum can reach 12°C (54°F), while the minimum can drop to as low as -17°C (2°F). Be prepared for a wide range of temperatures if you're traveling during this time!
In Ajax in December, the precipitation amount is 96 mm (3.8 in) over the course of 15 days.
In Ajax in December, humidity is 87%. With an average temperature of 1°C (33°F), this humidity feels like a chilling blanket, making traveling uncomfortable as the cold air clings to your skin, amplifying the frosty bite and dampness that can quickly lead to a sense of unease.
In Ajax 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 Ajax, you can visit Hourly UV Index in Ajax.
UV Risk Categories
Weather in Ajax varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Ajax, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (28°F) | 84 mm (3.3 inches) | 91% | low |
| February Weather | -2°C (28°F) | 88 mm (3.5 inches) | 91% | moderate |
| March Weather | 1°C (33°F) | 77 mm (3.0 inches) | 88% | moderate |
| April Weather | 5°C (41°F) | 122 mm (4.8 inches) | 88% | very high |
| May Weather | 9°C (49°F) | 105 mm (4.1 inches) | 82% | very high |
| June Weather | 16°C (60°F) | 77 mm (3.0 inches) | 79% | very high |
| July Weather | 21°C (70°F) | 70 mm (2.7 inches) | 77% | very high |
| August Weather | 22°C (71°F) | 78 mm (3.1 inches) | 72% | very high |
| September Weather | 18°C (65°F) | 73 mm (2.9 inches) | 76% | high |
| October Weather | 13°C (55°F) | 118 mm (4.6 inches) | 83% | moderate |
| November Weather | 5°C (41°F) | 102 mm (4.0 inches) | 88% | moderate |
| December Weather | 1°C (33°F) | 96 mm (3.8 inches) | 87% | low |