Last updated: June 24, 2025
In December, the average temperature in Union City, United States hovers around 0°C (33°F). Expect chilly nights with minimums dipping to -22°C (-8°F), while daytime highs can reach a mild 16°C (62°F). This month brings about 60 mm (2.4 in) of precipitation spread over 10 days, contributing to an average humidity of 86%. Prepare for a damp and brisk atmosphere!
In December in Union City, the average temperature is 0°C (33°F), with maximums reaching 16°C (62°F) and minimums dropping as low as -22°C (-8°F). Be prepared for a wide range of temperatures when planning your travel, and pack accordingly!
In Union City in December, the precipitation amount is 60 mm (2.4 in) accumulated over a period of 10 days.
In Union City in December humidity is 86%. With an average temperature of 0°C (33°F), this humidity feels like a damp chill that permeates your clothes, making traveling uncomfortable and necessitating warm, layered clothing to stay dry and cozy.
In Union City 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 Union City, you can visit Hourly UV Index in Union City.
UV Risk Categories
Weather in Union City varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Union City, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 71 mm (2.8 inches) | 85% | moderate |
| February Weather | -2°C (28°F) | 75 mm (2.9 inches) | 85% | moderate |
| March Weather | 3°C (38°F) | 89 mm (3.5 inches) | 86% | high |
| April Weather | 8°C (48°F) | 97 mm (3.8 inches) | 87% | very high |
| May Weather | 16°C (61°F) | 142 mm (5.6 inches) | 81% | very high |
| June Weather | 22°C (71°F) | 115 mm (4.5 inches) | 82% | very high |
| July Weather | 24°C (75°F) | 120 mm (4.7 inches) | 81% | very high |
| August Weather | 22°C (72°F) | 75 mm (3.0 inches) | 79% | very high |
| September Weather | 19°C (66°F) | 86 mm (3.4 inches) | 78% | very high |
| October Weather | 12°C (54°F) | 131 mm (5.2 inches) | 81% | high |
| November Weather | 4°C (39°F) | 77 mm (3.0 inches) | 89% | moderate |
| December Weather | 0°C (33°F) | 60 mm (2.4 inches) | 86% | low |