December Weather in Allentown

Last updated: March 2, 2024

The weather in Allentown, United States, during December is characterized by an average temperature of 4°C (39°F). Highs can soar to 17°C (63°F), while lows may dip to -9°C (17°F). Typically, the humidity level in Allentown throughout December hovers around 80%.

-9°C (17°F)

Minimum temperature

4°C (39°F)

Average temperature

17°C (63°F)

Maximum temperature

80%

Humidity

Precipitation and Sunshine hours

In December, Allentown averages 102 mm (4.0 inches) of rainfall, typically over the course of 9 rainy days. The month enjoys an average of 9 hours 19 minutes of daylight, with the sun shining for approximately 5 hours 51 minutes each day. Additionally, there is a 32% probability of sunny days during this period.

102 mm (4.0 inches)

Precipitation

9 rainy days

Rainy days

5 hours 51 minutes

Sunshine hours

32%

Chance of sun

UV Index

In December, the UV Index in Allentown reaches a maximum of 2, indicating a level of Low exposure. The most intense UV radiation typically occurs between 10:00 and 12:00, during which unprotected skin may burn in as little as 45 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 0 1 1 2 2 2 2 1 1 1 0 0 0
Exposure Low
Time to burn 45 min

Compare Allentown's Climate with Cities Worldwide