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December Weather in Lisbon, United States

Last updated: June 24, 2025

In December, the average temperature in Lisbon, United States hovers around 2°C (35°F), with extremes ranging from a chilly -17°C (2°F) to a mild 17°C (64°F). Visitors should prepare for 95 mm (3.8 in) of precipitation over approximately 10 days, and expect a high average humidity of 86%.

December Temperature in Lisbon

In December in Lisbon, the average temperature is 2°C (35°F). The maximum can reach 17°C (64°F), while the minimum can drop as low as -17°C (2°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

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 2°C (35°F), with highs reaching up to 17°C (64°F) and lows dropping to around -17°C (2°F).
JanFebMarAprMayJunJulAugSepOctNovDec303340506270747267564135
Data source: Temperature data for Lisbon generated using information from the Copernicus Climate Change Service.
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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 95 mm (3.8 in) over the course of 10 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 95 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec91106101132130131133991151169496
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Lisbon

In Lisbon in December humidity is 86%. With an average temperature of 2°C (35°F), this humidity feels like a damp chill that seeps into your bones, making traveling quite uncomfortable as your clothes cling to you and the cold air cuts through any warmth you try to find.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%87%81%83%82%76%77%82%89%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
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-1°C (30°F)91 mm (3.6 inches)88%moderate
February Weather1°C (34°F)106 mm (4.2 inches)88%moderate
March Weather5°C (41°F)101 mm (4.0 inches)87%high
April Weather10°C (51°F)132 mm (5.2 inches)87%very high
May Weather16°C (62°F)130 mm (5.1 inches)81%very high
June Weather21°C (70°F)131 mm (5.2 inches)83%very high
July Weather24°C (75°F)133 mm (5.2 inches)82%very high
August Weather22°C (72°F)98 mm (3.9 inches)76%very high
September Weather19°C (67°F)114 mm (4.5 inches)77%very high
October Weather14°C (57°F)116 mm (4.6 inches)82%high
November Weather5°C (41°F)94 mm (3.7 inches)89%moderate
December Weather2°C (35°F)95 mm (3.8 inches)86%low

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