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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 (36°F). Expect chilly conditions, with minimum lows plunging to -15°C (5°F) and occasional highs reaching up to 17°C (63°F). Prepare for 130 mm (5.1 in) of precipitation over about 10 days, contributing to an average humidity level of 80%.

December Temperature in Lisbon

In December in Lisbon, the average temperature is 2°C (36°F). Maximums can reach 17°C (63°F), while minimums can plummet to as low as -15°C (5°F). Travelers should be prepared for a wide range of temperatures and dress accordingly to ensure comfort during their stay.

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 (36°F), with highs reaching up to 17°C (63°F) and lows dropping to around -15°C (5°F).
JanFebMarAprMayJunJulAugSepOctNovDec323439495968747367574436
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 130 mm (5.1 in) over a period 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 130 mm (5.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec7292981291099614911196132101130
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 80%. With an average temperature of 2°C (36°F), this humidity feels like a heavy, damp chill that seeps into your bones, making it challenging for outdoor adventures and often necessitating layered clothing to stay warm and comfortable while exploring.

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 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%82%79%75%78%76%76%76%75%80%80%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3568910998642
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 Weather0°C (33°F)72 mm (2.8 inches)84%moderate
February Weather1°C (35°F)92 mm (3.6 inches)84%moderate
March Weather4°C (40°F)98 mm (3.8 inches)82%high
April Weather9°C (49°F)129 mm (5.1 inches)79%very high
May Weather15°C (59°F)109 mm (4.3 inches)75%very high
June Weather20°C (68°F)96 mm (3.8 inches)78%very high
July Weather23°C (75°F)149 mm (5.8 inches)76%very high
August Weather23°C (74°F)111 mm (4.4 inches)76%very high
September Weather19°C (67°F)96 mm (3.8 inches)75%very high
October Weather14°C (58°F)132 mm (5.2 inches)75%high
November Weather7°C (45°F)101 mm (4.0 inches)80%moderate
December Weather2°C (36°F)130 mm (5.1 inches)80%low

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