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December Weather in Islandia, United States

Last updated: June 24, 2025

In December, the average temperature in Islandia, United States is a brisk 5°C (41°F), with temperatures dipping as low as -9°C (16°F) and peaking at a mild 17°C (62°F). Expect 138 mm (5.4 in) of precipitation over 10 days, and be prepared for a high average humidity of 80%.

December Temperature in Islandia

In December in Islandia, the average temperature is 5°C (41°F). Maximum temperatures can reach 17°C (62°F), while minimum temperatures can drop as low as -9°C (16°F). Be sure to pack layers to stay comfortable in the varying temperatures!

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

The chart illustrates December temperature patterns in Islandia, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Islandia, December typically has an average temperature of 5°C (41°F), with highs reaching up to 17°C (62°F) and lows dropping to around -9°C (16°F).
JanFebMarAprMayJunJulAugSepOctNovDec363740485768757570614941
Data source: Temperature data for Islandia 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 Islandia

In Islandia in December, the precipitation amount is 138 mm (5.4 in) over a span of 10 days.

December Precipitation Trends in Islandia

The chart displays monthly precipitation patterns in Islandia, 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 Islandia, December typically receives around 138 mm (5.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec831181071301238613010996142105138
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Islandia

In Islandia in December humidity is 80%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration feel much colder than it actually is, leading to the necessity of layering up to stay comfortable while traveling.

December Average Humidity in Islandia

This chart illustrates the average monthly humidity levels in Islandia, 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 Islandia is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Islandia

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

Maximum UV Index Levels in Islandia for December

The chart shows the monthly maximum UV Index (UVI) for Islandia 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 Islandia typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Islandia 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 Islandia Compares to Other Months

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

This table compares monthly weather conditions in Islandia, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)82 mm (3.2 inches)84%moderate
February Weather3°C (37°F)118 mm (4.6 inches)82%moderate
March Weather5°C (41°F)107 mm (4.2 inches)81%high
April Weather9°C (49°F)130 mm (5.1 inches)78%very high
May Weather14°C (58°F)123 mm (4.9 inches)69%very high
June Weather20°C (68°F)86 mm (3.4 inches)69%very high
July Weather24°C (76°F)130 mm (5.1 inches)62%very high
August Weather24°C (75°F)109 mm (4.3 inches)65%very high
September Weather21°C (70°F)96 mm (3.8 inches)68%very high
October Weather16°C (61°F)142 mm (5.6 inches)74%high
November Weather9°C (49°F)105 mm (4.1 inches)82%moderate
December Weather5°C (41°F)138 mm (5.4 inches)80%low

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