Last updated: June 24, 2025
In December, the average temperature in Union, United States hovers around 4°C (39°F). Prepare for a range that can dip as low as -16°C (4°F) and rise to a comfortable 23°C (74°F). Expect about 54 mm (2.1 in) of precipitation over approximately 6 days, all while maintaining an average humidity of 86%.
In December in Union, the average temperature is 4°C (39°F), with a maximum that can reach 23°C (74°F) and a minimum that can drop to -16°C (4°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.
In Union in December, the total precipitation amount is 54 mm (2.1 in) over the course of 6 days.
In Union in December humidity is 86%. With an average temperature of 4°C (39°F), this humidity feels like a chilly mist enveloping you, making it essential to bundle up while exploring, as each breath comes with a damp chill that can be quite refreshing yet starkly invigorating for travelers.
In Union 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 Union, you can check the information here.
UV Risk Categories
Weather in Union varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Union, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 0°C (33°F) | 75 mm (2.9 inches) | 82% | moderate |
February Weather | 2°C (36°F) | 80 mm (3.1 inches) | 80% | moderate |
March Weather | 8°C (47°F) | 126 mm (5.0 inches) | 80% | high |
April Weather | 13°C (55°F) | 126 mm (5.0 inches) | 80% | very high |
May Weather | 19°C (66°F) | 152 mm (6.0 inches) | 82% | very high |
June Weather | 24°C (76°F) | 89 mm (3.5 inches) | 83% | extreme |
July Weather | 26°C (79°F) | 100 mm (3.9 inches) | 81% | extreme |
August Weather | 24°C (76°F) | 145 mm (5.7 inches) | 80% | very high |
September Weather | 22°C (72°F) | 55 mm (2.2 inches) | 76% | very high |
October Weather | 15°C (59°F) | 108 mm (4.2 inches) | 76% | high |
November Weather | 7°C (45°F) | 69 mm (2.7 inches) | 85% | moderate |
December Weather | 4°C (39°F) | 54 mm (2.1 inches) | 86% | moderate |