Last updated: June 24, 2025
In Olney, United States, the average temperature in December rests at a cool 4°C (39°F). Expect a range that dips to a brisk -17°C (1°F) at its lowest and can reach a pleasant 20°C (68°F) during warmer days. Prepare for about 92 mm (3.6 in) of precipitation spread across 8 days, coupled with a high average humidity of 87%. It's a month where layered clothing and a compact umbrella might just be your best companions!
In December in Olney, the average temperature is 4°C (39°F). Maximum temperatures can reach 20°C (68°F), while minimum temperatures can drop as low as -17°C (1°F). Travelers should be prepared for a range of weather conditions, from mild to quite cold, when visiting during this time.
In Olney in December, the precipitation amount is 92 mm (3.6 in), occurring over the course of 8 days.
In Olney in December, humidity is 87%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and gritty, as the air hangs heavy and clings to your skin.
In Olney 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 Olney, you can check the information here.
UV Risk Categories
Weather in Olney varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Olney, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (33°F) | 91 mm (3.6 inches) | 84% | moderate |
| February Weather | 2°C (37°F) | 105 mm (4.1 inches) | 82% | moderate |
| March Weather | 8°C (47°F) | 131 mm (5.2 inches) | 84% | high |
| April Weather | 13°C (56°F) | 119 mm (4.7 inches) | 83% | very high |
| May Weather | 20°C (68°F) | 137 mm (5.4 inches) | 80% | very high |
| June Weather | 25°C (77°F) | 114 mm (4.5 inches) | 83% | extreme |
| July Weather | 26°C (80°F) | 101 mm (4.0 inches) | 82% | very high |
| August Weather | 25°C (77°F) | 93 mm (3.7 inches) | 82% | very high |
| September Weather | 23°C (73°F) | 68 mm (2.7 inches) | 79% | very high |
| October Weather | 16°C (60°F) | 103 mm (4.1 inches) | 79% | high |
| November Weather | 7°C (44°F) | 102 mm (4.0 inches) | 88% | moderate |
| December Weather | 4°C (39°F) | 92 mm (3.6 inches) | 87% | moderate |