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December Weather in Shannon, United States

Last updated: June 24, 2025

In December, the average temperature in Shannon, United States hovers around 9°C (49°F), offering a mild climate with occasional surprises. While daytime highs can reach a pleasant 25°C (77°F), be prepared for chilly spells where temperatures may dip as low as -5°C (23°F). Expect about 142 mm (5.6 in) of precipitation spread over 12 days, contributing to an average humidity level of a cozy 88%.

December Temperature in Shannon

In December in Shannon, the average temperature is 9°C (49°F). The maximum can reach 25°C (77°F) and the minimum can be as low as -5°C (23°F). Pack for a range of temperatures to ensure a comfortable and enjoyable travel experience.

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

The chart illustrates December temperature patterns in Shannon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Shannon, December typically has an average temperature of 9°C (49°F), with highs reaching up to 25°C (77°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec455057627278818177665249
Data source: Temperature data for Shannon 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 Shannon

In Shannon in December, the total precipitation amount is 142 mm (5.6 in), occurring over the course of 12 days.

December Precipitation Trends in Shannon

The chart displays monthly precipitation patterns in Shannon, 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 Shannon, December typically receives around 142 mm (5.6 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec1241901611591221341041269011173142
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Shannon

In Shannon in December, humidity is 88%. With an average temperature of 9°C (49°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 Shannon

This chart illustrates the average monthly humidity levels in Shannon, 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 Shannon is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%82%79%82%77%74%73%85%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Shannon

In Shannon in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Shannon for better planning.

Maximum UV Index Levels in Shannon for December

The chart shows the monthly maximum UV Index (UVI) for Shannon 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 Shannon typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111109764
Data source: Shannon 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 Shannon Compares to Other Months

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

This table compares monthly weather conditions in Shannon, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)124 mm (4.9 inches)85%moderate
February Weather10°C (50°F)190 mm (7.5 inches)84%high
March Weather14°C (58°F)161 mm (6.3 inches)82%very high
April Weather17°C (63°F)159 mm (6.3 inches)82%very high
May Weather22°C (73°F)122 mm (4.8 inches)82%extreme
June Weather26°C (79°F)134 mm (5.3 inches)79%extreme
July Weather27°C (82°F)104 mm (4.1 inches)82%extreme
August Weather27°C (81°F)126 mm (5.0 inches)77%very high
September Weather25°C (77°F)90 mm (3.5 inches)74%very high
October Weather19°C (66°F)111 mm (4.4 inches)73%high
November Weather11°C (52°F)73 mm (2.9 inches)85%high
December Weather9°C (49°F)142 mm (5.6 inches)88%moderate

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