December Weather in Heidelberg

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%.

-2°C (28°F)

Minimum temperature

11°C (53°F)

Average temperature

25°C (77°F)

Maximum temperature

87%

Humidity

Precipitation and Sunshine hours

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.

133 mm (5.3 inches)

Precipitation

12 rainy days

Rainy days

6 hours 21 minutes

Sunshine hours

35%

Chance of sun

UV Index

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.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  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

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