Last updated: June 24, 2025
In December, the average temperature in Houston, United States hovers around -8°C (18°F). Expect chilly extremes, with minimums plunging to -27°C (-17°F) and maximums reaching a mild 7°C (45°F). Rainfall is moderate, accumulating to 76 mm (3.0 in) over 16 days, complemented by a high average humidity of 96%. Bundle up, as the cold and wet conditions prevail!
In December in Houston, the average temperature is -8°C (18°F), with maximums reaching 7°C (45°F) and minimums plummeting to as low as -27°C (-17°F). Travelers should be prepared for very cold weather and dress in layers to stay warm while enjoying the beautiful winter scenery.
In Houston in December, the precipitation amount is 76 mm (3.0 in) over a span of 16 days.
In Houston in December humidity is 96%. With an average temperature of -8°C (18°F), this humidity feels like an icy embrace, making traveling quite challenging as the cold dampness seeps into your bones, leaving you feeling chilled and uncomfortable.
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 | -12°C (11°F) | 38 mm (1.5 inches) | 94% | low |
| February Weather | -9°C (16°F) | 49 mm (1.9 inches) | 93% | low |
| March Weather | -6°C (21°F) | 42 mm (1.7 inches) | 91% | moderate |
| April Weather | 2°C (36°F) | 43 mm (1.7 inches) | 85% | moderate |
| May Weather | 9°C (48°F) | 99 mm (3.9 inches) | 88% | high |
| June Weather | 13°C (55°F) | 98 mm (3.9 inches) | 95% | high |
| July Weather | 15°C (60°F) | 103 mm (4.0 inches) | 102% | high |
| August Weather | 13°C (56°F) | 152 mm (6.0 inches) | 100% | moderate |
| September Weather | 9°C (48°F) | 106 mm (4.2 inches) | 96% | moderate |
| October Weather | 2°C (37°F) | 109 mm (4.3 inches) | 91% | low |
| November Weather | -7°C (20°F) | 63 mm (2.5 inches) | 95% | low |
| December Weather | -8°C (18°F) | 76 mm (3.0 inches) | 96% | low |