Last updated: June 24, 2025
In Crystal City, United States, the average temperature in December hovers around 15°C (59°F), with a possible minimum dipping to -2°C (28°F) and a peak soaring to 33°C (91°F). Expect a precipitation amount of 25 mm (1.0 in) over the course of 3 days, while average humidity remains relatively high at 86%.
In December in Crystal City, the average temperature is 15°C (59°F). Maximums can reach 33°C (91°F), and minimums can be as low as -2°C (28°F). This variation in temperature makes it essential to pack layers and prepare for diverse weather conditions while traveling.
In Crystal City in December, the precipitation amount is 25 mm (1.0 in) over the course of 3 days.
In Crystal City in December, humidity is 86%. With an average temperature of 15°C (59°F), this humidity feels like a warm, damp blanket that clings to your skin, making traveling slightly uncomfortable but still manageable if you stay hydrated and take breaks in shaded areas.
In Crystal City in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Crystal City.
UV Risk Categories
Weather in Crystal City varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Crystal City, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 13°C (56°F) | 21 mm (0.8 inches) | 79% | moderate |
| February Weather | 15°C (59°F) | 30 mm (1.2 inches) | 79% | very high |
| March Weather | 21°C (69°F) | 25 mm (1.0 inches) | 74% | very high |
| April Weather | 24°C (75°F) | 58 mm (2.3 inches) | 76% | extreme |
| May Weather | 27°C (82°F) | 101 mm (4.0 inches) | 81% | extreme |
| June Weather | 30°C (87°F) | 37 mm (1.4 inches) | 76% | extreme |
| July Weather | 32°C (89°F) | 40 mm (1.6 inches) | 66% | extreme |
| August Weather | 32°C (90°F) | 39 mm (1.5 inches) | 58% | extreme |
| September Weather | 29°C (84°F) | 118 mm (4.7 inches) | 65% | extreme |
| October Weather | 24°C (75°F) | 63 mm (2.5 inches) | 74% | very high |
| November Weather | 18°C (64°F) | 33 mm (1.3 inches) | 81% | high |
| December Weather | 15°C (59°F) | 25 mm (1.0 inches) | 86% | moderate |