Last updated: June 24, 2025
In December, the average temperature in Greater Upper Marlboro, United States hovers around 6°C (42°F). However, temperatures can vary significantly, with minimums plummeting to -10°C (15°F) and maximums reaching up to 20°C (68°F). During this month, expect approximately 89 mm (3.5 in) of precipitation spread over about 10 days, and keep in mind the average humidity sits at a humid 84%.
In December in Greater Upper Marlboro, the average temperature is 6°C (42°F). The maximum can reach 20°C (68°F), while the minimum can drop as low as -10°C (15°F). It’s advisable to pack layers to comfortably navigate the varying temperatures while traveling.
In Greater Upper Marlboro in December, the precipitation amount is 89 mm (3.5 in) over a period of 10 days.
In Greater Upper Marlboro in December humidity is 84%. With an average temperature of 6°C (42°F), this humidity feels like an uncomfortable chill that seeps into your bones, making travel less enjoyable as you find yourself bundled up yet still damp, longing for warmth and comfort.
In Greater Upper Marlboro 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 Greater Upper Marlboro, you can check the information here.
UV Risk Categories
Weather in Greater Upper Marlboro varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Greater Upper Marlboro, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 3°C (38°F) | 62 mm (2.4 inches) | 84% | moderate |
| February Weather | 5°C (42°F) | 97 mm (3.8 inches) | 83% | moderate |
| March Weather | 8°C (47°F) | 82 mm (3.2 inches) | 83% | high |
| April Weather | 14°C (57°F) | 101 mm (4.0 inches) | 81% | very high |
| May Weather | 19°C (67°F) | 127 mm (5.0 inches) | 78% | very high |
| June Weather | 24°C (76°F) | 107 mm (4.2 inches) | 79% | very high |
| July Weather | 27°C (81°F) | 167 mm (6.6 inches) | 74% | very high |
| August Weather | 25°C (78°F) | 162 mm (6.4 inches) | 72% | very high |
| September Weather | 22°C (73°F) | 102 mm (4.0 inches) | 75% | very high |
| October Weather | 17°C (63°F) | 117 mm (4.6 inches) | 81% | high |
| November Weather | 9°C (49°F) | 77 mm (3.0 inches) | 85% | moderate |
| December Weather | 6°C (42°F) | 89 mm (3.5 inches) | 84% | moderate |