Last updated: June 24, 2025
In December, the average temperature in Lanark, United States hovers around 0°C (32°F), with extremes ranging from a chilling -21°C (-6°F) to a milder 20°C (68°F). Expect about 51 mm (2.0 in) of precipitation over approximately 6 days, contributing to an average humidity of 84%. Ensure you’re prepared for the cold and damp conditions!
In December in Lanark, the average temperature is 0°C (32°F). Maximums can reach 20°C (68°F), while minimums can drop to as low as -21°C (-6°F). Be prepared for a wide range of temperatures when traveling to Lanark during this time.
In Lanark in December, the precipitation amount is 51 mm (2.0 in) over the course of 6 days.
In Lanark in December, humidity is 84%. With an average temperature of 0°C (32°F), this humidity feels like a cold, damp chill that seeps into your clothes, making traveling uncomfortable and necessitating extra layers to stay warm despite the moisture-laden air.
In Lanark 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 Lanark, you can visit Hourly UV Index in Lanark.
UV Risk Categories
Weather in Lanark varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Lanark, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (23°F) | 59 mm (2.3 inches) | 82% | moderate |
| February Weather | -4°C (25°F) | 59 mm (2.3 inches) | 83% | moderate |
| March Weather | 4°C (39°F) | 82 mm (3.2 inches) | 84% | high |
| April Weather | 9°C (48°F) | 108 mm (4.2 inches) | 85% | very high |
| May Weather | 16°C (61°F) | 148 mm (5.8 inches) | 79% | very high |
| June Weather | 22°C (72°F) | 129 mm (5.1 inches) | 82% | very high |
| July Weather | 24°C (76°F) | 89 mm (3.5 inches) | 80% | very high |
| August Weather | 22°C (73°F) | 82 mm (3.2 inches) | 81% | very high |
| September Weather | 20°C (67°F) | 119 mm (4.7 inches) | 80% | very high |
| October Weather | 12°C (53°F) | 113 mm (4.4 inches) | 82% | high |
| November Weather | 3°C (38°F) | 49 mm (1.9 inches) | 88% | moderate |
| December Weather | 0°C (32°F) | 51 mm (2.0 inches) | 84% | low |