Last updated: June 24, 2025
In December, the average temperature in Houston, United States hovers around 5°C (41°F). While you may experience chilly days with lows of -14°C (8°F), the weather can occasionally surprise you with highs reaching 25°C (77°F). Be prepared for some moisture, as the area sees about 63 mm (2.5 in) of precipitation over 7 days, accompanied by an average humidity of 86%.
In December in Houston, the average temperature is 5°C (41°F). Maximum temperatures can reach 25°C (77°F), while minimums can drop as low as -14°C (8°F). It’s advisable to pack layers and be prepared for a wide range of weather conditions when traveling during this time.
In Houston in December, the precipitation amount is 63 mm (2.5 in) over a span of 7 days.
In Houston in December humidity is 86%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket wrapping around you, making outdoor activities uncomfortable and travel quite challenging due to the chill combined with the stickiness in the air.
In Houston in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Houston, you can check the information here.
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 | 1°C (35°F) | 73 mm (2.9 inches) | 83% | moderate |
| February Weather | 3°C (38°F) | 100 mm (3.9 inches) | 81% | high |
| March Weather | 9°C (48°F) | 138 mm (5.4 inches) | 80% | high |
| April Weather | 13°C (55°F) | 170 mm (6.7 inches) | 80% | very high |
| May Weather | 18°C (65°F) | 188 mm (7.4 inches) | 83% | extreme |
| June Weather | 23°C (74°F) | 67 mm (2.7 inches) | 83% | extreme |
| July Weather | 26°C (78°F) | 75 mm (2.9 inches) | 76% | extreme |
| August Weather | 24°C (76°F) | 97 mm (3.8 inches) | 69% | very high |
| September Weather | 22°C (72°F) | 42 mm (1.6 inches) | 68% | very high |
| October Weather | 15°C (58°F) | 117 mm (4.6 inches) | 72% | high |
| November Weather | 7°C (45°F) | 68 mm (2.7 inches) | 83% | moderate |
| December Weather | 5°C (41°F) | 63 mm (2.5 inches) | 86% | moderate |