Last updated: June 24, 2025
In December, the average temperature in Washington Boro, United States hovers around 4°C (39°F), offering a chill that can dip as low as -12°C (11°F) and peak at a mild 18°C (65°F). Expect 93 mm (3.7 in) of precipitation over 9 days, contributing to an average humidity of 84%. Whether you’re bundling up for the cold or navigating the damp days, this month brings a unique blend of weather challenges and charm.
In December, in Washington Boro, the average temperature is 4°C (39°F), with maximums reaching up to 18°C (65°F) and minimums dropping as low as -12°C (11°F). This range suggests that travelers should prepare for a mix of mild and chilly weather, making it essential to pack layers for their visit.
In Washington Boro in December, the precipitation amount is 93 mm (3.7 in) over the course of 9 days.
In Washington Boro in December, humidity is 84%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making outdoor excursions uncomfortable and demanding more layers than you anticipate while traveling.
In Washington Boro in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Washington Boro, you can visit Hourly UV Index in Washington Boro.
UV Risk Categories
Weather in Washington Boro varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Washington Boro, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (35°F) | 60 mm (2.4 inches) | 84% | moderate |
| February Weather | 3°C (38°F) | 101 mm (4.0 inches) | 83% | moderate |
| March Weather | 6°C (44°F) | 99 mm (3.9 inches) | 83% | high |
| April Weather | 12°C (54°F) | 98 mm (3.9 inches) | 81% | very high |
| May Weather | 18°C (64°F) | 125 mm (4.9 inches) | 78% | very high |
| June Weather | 23°C (73°F) | 97 mm (3.8 inches) | 79% | very high |
| July Weather | 26°C (79°F) | 130 mm (5.1 inches) | 74% | very high |
| August Weather | 24°C (76°F) | 130 mm (5.1 inches) | 72% | very high |
| September Weather | 21°C (70°F) | 108 mm (4.2 inches) | 75% | very high |
| October Weather | 16°C (60°F) | 101 mm (4.0 inches) | 81% | high |
| November Weather | 7°C (45°F) | 88 mm (3.5 inches) | 85% | moderate |
| December Weather | 4°C (39°F) | 93 mm (3.7 inches) | 84% | low |