Last updated: March 2, 2024
The weather in Heidelberg, United States, during December is characterized by an average temperature of 11°C (53°F). Highs can soar to 25°C (77°F), while lows may dip to -2°C (28°F). Typically, the humidity level in Heidelberg throughout December hovers around 87%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In December, Heidelberg averages 133 mm (5.3 inches) of rainfall, typically over the course of 12 rainy days. The month enjoys an average of 10 hours 5 minutes of daylight, with the sun shining for approximately 6 hours 21 minutes each day. Additionally, there is a 35% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In December, the UV Index in Heidelberg reaches a maximum of 4, indicating a level of Moderate exposure. The most intense UV radiation typically occurs between 11:00 and 13:00, during which unprotected skin may burn in as little as 30 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 1 | 2 | 3 | 4 | 4 | 3 | 2 | 1 | 1 | 0 | 0 | 0 |
| Exposure | Low | Moderate | Low | ||||||||||
| Time to burn | 45 min | 30 min | 45 min | ||||||||||