December Weather in South Portland

Last updated: March 2, 2024

The weather in South Portland, United States, during December is characterized by an average temperature of 0°C (33°F). Highs can soar to 12°C (54°F), while lows may dip to -12°C (11°F). Typically, the humidity level in South Portland throughout December hovers around 81%.

-12°C (11°F)

Minimum temperature

0°C (33°F)

Average temperature

12°C (54°F)

Maximum temperature

81%

Humidity

Precipitation and Sunshine hours

In December, South Portland averages 144 mm (5.7 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 8 hours 58 minutes of daylight, with the sun shining for approximately 5 hours 35 minutes each day. Additionally, there is a 33% probability of sunny days during this period.

144 mm (5.7 inches)

Precipitation

10 rainy days

Rainy days

5 hours 35 minutes

Sunshine hours

33%

Chance of sun

UV Index

In December, the UV Index in South Portland 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 1 1 1 2 2 2 2 1 1 1 0 0 0
Exposure Low
Time to burn 45 min

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