Last updated: June 24, 2025
In December, the average temperature in Normal, United States hovers around 1°C (35°F), presenting a chilly feel. Temperatures can dip as low as -21°C (-6°F), while reaching a comfortable maximum of 19°C (67°F). Expect about 55 mm (2.2 in) of precipitation over 7 days, contributing to an average humidity level of a brisk 84%.
In December in Normal, the average temperature is 1°C (35°F), with maximums reaching 19°C (67°F) and minimums dropping to as low as -21°C (-6°F). This stark temperature variation makes Normal an intriguing destination for travelers seeking to experience both winter's chill and the onset of early spring warmth.
In Normal in December, the precipitation amount is 55 mm (2.2 in) over the course of 7 days.
In Normal in December humidity is 84%. With an average temperature of 1°C (35°F), this humidity feels like a cold, damp chill that seeps into your bones, making it feel much colder than the thermometer suggests, which can be quite uncomfortable for traveling.
In Normal 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 Normal, you can visit Hourly UV Index in Normal.
UV Risk Categories
Weather in Normal varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Normal, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 65 mm (2.5 inches) | 82% | moderate |
| February Weather | -1°C (30°F) | 69 mm (2.7 inches) | 83% | moderate |
| March Weather | 5°C (42°F) | 113 mm (4.4 inches) | 84% | high |
| April Weather | 11°C (51°F) | 118 mm (4.6 inches) | 85% | very high |
| May Weather | 18°C (64°F) | 159 mm (6.3 inches) | 79% | very high |
| June Weather | 23°C (74°F) | 119 mm (4.7 inches) | 82% | extreme |
| July Weather | 25°C (77°F) | 105 mm (4.1 inches) | 80% | very high |
| August Weather | 23°C (74°F) | 94 mm (3.7 inches) | 81% | very high |
| September Weather | 21°C (70°F) | 62 mm (2.4 inches) | 80% | very high |
| October Weather | 13°C (56°F) | 125 mm (4.9 inches) | 82% | high |
| November Weather | 5°C (41°F) | 62 mm (2.4 inches) | 88% | moderate |
| December Weather | 1°C (35°F) | 55 mm (2.2 inches) | 84% | low |