Last updated: June 24, 2025
In Fennimore, United States, the average temperature in December hovers around -2°C (29°F). However, be prepared for temperature fluctuations, as it can plummet to a chilling -22°C (-8°F) or occasionally rise to a mild 20°C (68°F). Don’t forget your umbrella—expect about 40 mm (1.6 in) of precipitation over roughly 6 days during the month, coupled with an average humidity of 82% that adds to the chilly atmosphere.
In December in Fennimore, the average temperature is -2°C (29°F), with maximums reaching 20°C (68°F) and minimums dropping as low as -22°C (-8°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both chilly and unexpectedly warm days.
In Fennimore in December, the precipitation amount is 40 mm (1.6 in) over the course of 6 days.
In Fennimore in December, humidity is 82%. With an average temperature of -2°C (29°F), this humidity feels like a frigid chill that seeps into your bones, making travel quite uncomfortable and forcing you to bundle up tightly to ward off the damp cold that lingers in the air.
In Fennimore 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 Fennimore, you can visit Hourly UV Index in Fennimore.
UV Risk Categories
Weather in Fennimore varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Fennimore, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 43 mm (1.7 inches) | 84% | moderate |
| February Weather | -5°C (23°F) | 55 mm (2.2 inches) | 85% | moderate |
| March Weather | 3°C (37°F) | 59 mm (2.3 inches) | 84% | moderate |
| April Weather | 8°C (47°F) | 84 mm (3.3 inches) | 83% | very high |
| May Weather | 16°C (60°F) | 137 mm (5.4 inches) | 75% | very high |
| June Weather | 22°C (72°F) | 132 mm (5.2 inches) | 79% | very high |
| July Weather | 24°C (75°F) | 108 mm (4.3 inches) | 75% | very high |
| August Weather | 22°C (71°F) | 91 mm (3.6 inches) | 69% | very high |
| September Weather | 19°C (66°F) | 120 mm (4.7 inches) | 74% | very high |
| October Weather | 11°C (51°F) | 125 mm (4.9 inches) | 79% | moderate |
| November Weather | 2°C (37°F) | 47 mm (1.9 inches) | 88% | moderate |
| December Weather | -2°C (29°F) | 40 mm (1.6 inches) | 82% | low |