Last updated: June 24, 2025
In Boulder City, United States, the average temperature in December hovers around 10°C (50°F). Expect a minimum of 0°C (33°F) and a potential maximum of 24°C (75°F). During this time, the area typically sees precipitation totaling 15 mm (0.6 in) over the course of 2 days, accompanied by an average humidity level of 77%.
In December in Boulder City, the average temperature is 10°C (50°F). Maximum temperatures can reach 24°C (75°F), while minimums can dip as low as 0°C (33°F). This makes Boulder City an ideal destination for travelers seeking a mild climate with the possibility of warm afternoons.
In Boulder City in December, the precipitation amount is 15 mm (0.6 in) over the course of 2 days.
In Boulder City in December, humidity is 77%. With an average temperature of 10°C (50°F), this humidity feels like a thick, heavy blanket enveloping you, making travel uncomfortable and sticky, as it clings to your skin and clothes, turning each step into a challenge.
In Boulder City 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 Boulder City, you can check the information here.
UV Risk Categories
Weather in Boulder City varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Boulder City, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 10°C (50°F) | 21 mm (0.8 inches) | 77% | moderate |
| February Weather | 12°C (53°F) | 21 mm (0.8 inches) | 80% | high |
| March Weather | 16°C (61°F) | 20 mm (0.8 inches) | 68% | very high |
| April Weather | 22°C (71°F) | 5 mm (0.2 inches) | 58% | very high |
| May Weather | 26°C (78°F) | 6 mm (0.2 inches) | 45% | extreme |
| June Weather | 33°C (91°F) | 1 mm (0.0 inches) | 31% | extreme |
| July Weather | 35°C (96°F) | 17 mm (0.7 inches) | 27% | extreme |
| August Weather | 35°C (95°F) | 11 mm (0.4 inches) | 30% | extreme |
| September Weather | 30°C (86°F) | 5 mm (0.2 inches) | 48% | very high |
| October Weather | 21°C (71°F) | 8 mm (0.3 inches) | 59% | high |
| November Weather | 15°C (60°F) | 19 mm (0.7 inches) | 70% | moderate |
| December Weather | 10°C (50°F) | 15 mm (0.6 inches) | 77% | moderate |