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December Weather in Charlestown, Ireland

Last updated: August 23, 2025

In December, the average temperature in Charlestown, Ireland hovers around 6°C (44°F). Expect chilly nights with a minimum of -3°C (28°F) and mild days reaching up to 13°C (55°F). With an average precipitation of 109 mm (4.3 in) spread over 19 days, don't forget your umbrella! The air is notably humid, with an average humidity level of 89%.

December Temperature in Charlestown

In December in Charlestown, the average temperature is 6°C (44°F). The maximum can reach 13°C (55°F), and the minimum can be as low as -3°C (28°F). Be sure to pack for chilly weather and prepare for some cool days if you're planning to travel during this time.

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

The chart illustrates December temperature patterns in Charlestown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Charlestown, December typically has an average temperature of 6°C (44°F), with highs reaching up to 13°C (55°F) and lows dropping to around -3°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec424344475256595855504643
Data source: Temperature data for Charlestown 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 Charlestown

In Charlestown in December, the precipitation amount is 109 mm (4.3 in) over the course of 19 days.

December Precipitation Trends in Charlestown

The chart displays monthly precipitation patterns in Charlestown, 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 Charlestown, December typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec791241076582989614790120104109
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Charlestown

In Charlestown in December, humidity is 89%. With an average temperature of 6°C (44°F), this humidity feels like an uncomfortable chill that clings to your skin, making it difficult to enjoy outdoor activities and ideal for layered clothing.

December Average Humidity in Charlestown

This chart illustrates the average monthly humidity levels in Charlestown, 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 Charlestown is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%86%83%83%85%85%88%91%92%89%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Charlestown

In Charlestown in December, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Charlestown.

Maximum UV Index Levels in Charlestown for December

The chart shows the monthly maximum UV Index (UVI) for Charlestown 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 Charlestown typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875321
Data source: Charlestown 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 Charlestown Compares to Other Months

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

This table compares monthly weather conditions in Charlestown, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (42°F)79 mm (3.1 inches)88%low
February Weather6°C (43°F)124 mm (4.9 inches)88%low
March Weather6°C (44°F)107 mm (4.2 inches)87%moderate
April Weather9°C (48°F)65 mm (2.6 inches)86%moderate
May Weather11°C (53°F)82 mm (3.2 inches)83%high
June Weather13°C (56°F)98 mm (3.8 inches)83%very high
July Weather15°C (59°F)96 mm (3.8 inches)85%very high
August Weather15°C (59°F)147 mm (5.8 inches)85%high
September Weather13°C (55°F)90 mm (3.5 inches)88%moderate
October Weather10°C (50°F)120 mm (4.7 inches)91%moderate
November Weather8°C (46°F)104 mm (4.1 inches)92%low
December Weather6°C (44°F)109 mm (4.3 inches)89%low

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