Last updated: June 18, 2025
In December, the average temperature in Houston, Canada is a chilly -8°C (18°F). Expect wild fluctuations, with minimums plunging to -40°C (-39°F) and maximums peaking at 5°C (41°F). Prepare for wet conditions as well, with 67 mm (2.6 in) of precipitation spread across 12 days, and keep in mind the air will feel damp with an average humidity of 98%. Bundle up!
In December, in Houston, the average temperature is -8°C (18°F). The maximum can reach 5°C (41°F), while the minimum can drop to as low as -40°C (-39°F). Travelers should prepare for extremely cold weather and dressing in layers is essential for staying warm.
In Houston in December, the precipitation amount is 67 mm (2.6 in) distributed over 12 days.
In Houston in December, humidity is 98%. With an average temperature of -8°C (18°F), this humidity feels like stepping into a cold, damp cloud that clings to your skin, making travel uncomfortable and draining, as each breath feels heavy with moisture and the biting cold seeps into your bones.
In Houston in December, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Houston.
UV Risk Categories
Weather in Houston varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Houston, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (17°F) | 78 mm (3.1 inches) | 96% | low |
| February Weather | -9°C (16°F) | 57 mm (2.2 inches) | 94% | low |
| March Weather | -3°C (27°F) | 57 mm (2.3 inches) | 93% | moderate |
| April Weather | 1°C (34°F) | 40 mm (1.6 inches) | 91% | moderate |
| May Weather | 8°C (46°F) | 64 mm (2.5 inches) | 88% | high |
| June Weather | 11°C (52°F) | 68 mm (2.7 inches) | 84% | high |
| July Weather | 13°C (56°F) | 72 mm (2.8 inches) | 87% | very high |
| August Weather | 13°C (56°F) | 52 mm (2.1 inches) | 88% | high |
| September Weather | 8°C (48°F) | 93 mm (3.7 inches) | 91% | high |
| October Weather | 2°C (36°F) | 101 mm (4.0 inches) | 95% | moderate |
| November Weather | -2°C (29°F) | 117 mm (4.6 inches) | 98% | low |
| December Weather | -8°C (18°F) | 67 mm (2.6 inches) | 98% | low |