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December Weather in Castletown, Ireland

Last updated: August 23, 2025

In Castletown, Ireland, the average temperature in December hovers around 7°C (44°F). Expect chilly days with minimums plunging to -2°C (28°F) and highs reaching up to 13°C (56°F). Rainfall is common, totaling 107 mm (4.2 in) over 14 days, accompanied by a high average humidity of 84%.

December Temperature in Castletown

In December in Castletown, the average temperature is 7°C (44°F). Maximums can reach 13°C (56°F), and minimums can drop to as low as -2°C (28°F). Be prepared for a mix of cool and chilly weather when traveling during this time.

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

The chart illustrates December temperature patterns in Castletown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castletown, December typically has an average temperature of 7°C (44°F), with highs reaching up to 13°C (56°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec434344475257616057524744
Data source: Temperature data for Castletown 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 Castletown

In Castletown in December, the precipitation amount is 107 mm (4.2 in) spread over a period of 14 days.

December Precipitation Trends in Castletown

The chart displays monthly precipitation patterns in Castletown, 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 Castletown, December typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec53887955706768967693108107
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Castletown

In Castletown in December humidity is 84%. With an average temperature of 7°C (44°F), this humidity feels like a damp chill that seeps into your bones, making it uncomfortable for traveling and requiring extra layers to stay warm and dry.

December Average Humidity in Castletown

This chart illustrates the average monthly humidity levels in Castletown, 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 Castletown is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%86%85%83%85%86%85%86%87%87%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Castletown

In Castletown 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 Castletown.

Maximum UV Index Levels in Castletown for December

The chart shows the monthly maximum UV Index (UVI) for Castletown 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 Castletown typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Castletown 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 Castletown Compares to Other Months

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

This table compares monthly weather conditions in Castletown, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)53 mm (2.1 inches)85%low
February Weather6°C (44°F)87 mm (3.4 inches)86%low
March Weather7°C (45°F)79 mm (3.1 inches)86%moderate
April Weather8°C (47°F)55 mm (2.2 inches)85%moderate
May Weather11°C (52°F)70 mm (2.8 inches)83%high
June Weather14°C (57°F)67 mm (2.6 inches)85%very high
July Weather16°C (61°F)68 mm (2.7 inches)86%very high
August Weather15°C (60°F)96 mm (3.8 inches)85%high
September Weather14°C (57°F)76 mm (3.0 inches)86%moderate
October Weather11°C (52°F)93 mm (3.6 inches)87%moderate
November Weather8°C (47°F)108 mm (4.3 inches)86%low
December Weather7°C (44°F)107 mm (4.2 inches)84%low

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