nomadseason

December Weather in Lisbon, United States

Last updated: June 24, 2025

In Lisbon, United States, the average temperature in December hovers around -7°C (20°F), with extremes ranging from a chilling -30°C (-22°F) to a mild 13°C (55°F). During this month, expect about 37 mm (1.5 in) of precipitation over 7 days, while the average humidity remains high at 84%.

December Temperature in Lisbon

In December in Lisbon, the average temperature is -7°C (20°F). The maximum can reach 13°C (55°F), while the minimum can plummet to -30°C (-22°F). Be sure to pack warm layers if you're planning a trip during this time to stay comfortable in the extreme temperatures.

December Weather in Lisbon: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Lisbon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lisbon, December typically has an average temperature of -7°C (20°F), with highs reaching up to 13°C (55°F) and lows dropping to around -30°C (-22°F).
JanFebMarAprMayJunJulAugSepOctNovDec121129405669736961443020
Data source: Temperature data for Lisbon generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Lisbon

In Lisbon in December, the precipitation amount is 37 mm (1.5 in) during a span of 7 days.

December Precipitation Trends in Lisbon

The chart displays monthly precipitation patterns in Lisbon, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Lisbon, December typically receives around 37 mm (1.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec1820285157797110867841637
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Lisbon

In Lisbon in December, humidity is 84%. With an average temperature of -7°C (20°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and requiring extra layers to stay warm and dry.

December Average Humidity in Lisbon

This chart illustrates the average monthly humidity levels in Lisbon, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Lisbon is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%89%82%79%74%78%76%77%72%74%85%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Lisbon

In Lisbon 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 Lisbon, you can visit Hourly UV Index in Lisbon.

Maximum UV Index Levels in Lisbon for December

The chart shows the monthly maximum UV Index (UVI) for Lisbon in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Lisbon typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910987532
Data source: Lisbon December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Lisbon Compares to Other Months

Weather in Lisbon varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Lisbon, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Lisbon, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-11°C (13°F)18 mm (0.7 inches)87%low
February Weather-11°C (12°F)20 mm (0.8 inches)89%moderate
March Weather-2°C (29°F)28 mm (1.1 inches)82%moderate
April Weather4°C (40°F)51 mm (2.0 inches)79%high
May Weather14°C (57°F)57 mm (2.3 inches)74%very high
June Weather21°C (70°F)79 mm (3.1 inches)78%very high
July Weather23°C (73°F)71 mm (2.8 inches)76%very high
August Weather20°C (69°F)108 mm (4.2 inches)77%very high
September Weather16°C (61°F)66 mm (2.6 inches)72%high
October Weather7°C (45°F)84 mm (3.3 inches)74%moderate
November Weather-1°C (30°F)16 mm (0.6 inches)85%moderate
December Weather-7°C (20°F)37 mm (1.5 inches)84%low

Compare Lisbon's Climate with Cities Worldwide