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December Weather in Castleisland, Ireland

Last updated: August 23, 2025

In December, the average temperature in Castleisland, Ireland hovers around 7°C (45°F), with extremes ranging from a chilly -1°C (30°F) to a maximum of 13°C (56°F). Expect a total precipitation of 126 mm (5.0 in) over approximately 19 days, and prepare for a high level of humidity, averaging 89%.

December Temperature in Castleisland

In December in Castleisland, the average temperature is 7°C (45°F). Maximum temperatures can reach 13°C (56°F), while minimums can dip to as low as -1°C (30°F). Be sure to pack warm clothing if you're planning to travel during this month!

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

The chart illustrates December temperature patterns in Castleisland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castleisland, December typically has an average temperature of 7°C (45°F), with highs reaching up to 13°C (56°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec434444485256595956514645
Data source: Temperature data for Castleisland 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 Castleisland

In Castleisland in December, the precipitation amount is 126 mm (5.0 in) spread over 19 days.

December Precipitation Trends in Castleisland

The chart displays monthly precipitation patterns in Castleisland, 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 Castleisland, December typically receives around 126 mm (5.0 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec74118104656964681148010996126
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Castleisland

In Castleisland in December, humidity is 89%. With an average temperature of 7°C (45°F), this humidity feels like stepping into a damp cloud, making traveling quite uncomfortable as the moisture clings to your skin and clothes, turning even mild activity into a sweaty ordeal.

December Average Humidity in Castleisland

This chart illustrates the average monthly humidity levels in Castleisland, 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 Castleisland 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 Castleisland

In Castleisland 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 Castleisland.

Maximum UV Index Levels in Castleisland for December

The chart shows the monthly maximum UV Index (UVI) for Castleisland 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 Castleisland typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124678875421
Data source: Castleisland 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 Castleisland Compares to Other Months

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

This table compares monthly weather conditions in Castleisland, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)74 mm (2.9 inches)88%low
February Weather7°C (44°F)118 mm (4.6 inches)88%low
March Weather7°C (44°F)104 mm (4.1 inches)87%moderate
April Weather9°C (48°F)65 mm (2.6 inches)86%high
May Weather11°C (52°F)69 mm (2.7 inches)83%high
June Weather13°C (57°F)64 mm (2.5 inches)83%very high
July Weather15°C (60°F)68 mm (2.7 inches)85%very high
August Weather15°C (59°F)114 mm (4.5 inches)85%high
September Weather13°C (56°F)80 mm (3.2 inches)88%moderate
October Weather10°C (51°F)109 mm (4.3 inches)91%moderate
November Weather8°C (47°F)96 mm (3.8 inches)92%low
December Weather7°C (45°F)126 mm (5.0 inches)89%low

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