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December Weather in Greencastle, Ireland

Last updated: August 23, 2025

In December, the average temperature in Greencastle, Ireland hovers around 8°C (46°F), with a minimum of 2°C (35°F) and a maximum reaching 12°C (54°F). Expect 163 mm (6.4 in) of precipitation spread across 22 days, contributing to an average humidity of 86%. Prepare for a cool and often damp month!

December Temperature in Greencastle

In December in Greencastle, the average temperature is 8°C (46°F), with a maximum reaching 12°C (54°F) and a minimum dipping as low as 2°C (35°F). It's advisable to pack layers and prepare for a mix of cool days and chilly evenings while traveling.

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

The chart illustrates December temperature patterns in Greencastle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Greencastle, December typically has an average temperature of 8°C (46°F), with highs reaching up to 12°C (54°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec444344465054575856524846
Data source: Temperature data for Greencastle 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 Greencastle

In Greencastle in December, the precipitation amount is 163 mm (6.4 in) over the course of 22 days.

December Precipitation Trends in Greencastle

The chart displays monthly precipitation patterns in Greencastle, 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 Greencastle, December typically receives around 163 mm (6.4 inches) of precipitation spread over approximately 22 days.
JanFebMarAprMayJunJulAugSepOctNovDec1071351236179114118165125169150163
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Greencastle

In Greencastle in December humidity is 86%. With an average temperature of 8°C (46°F), this humidity feels like a damp chill enveloping you, making outdoor activities less enjoyable and requiring extra layers to stay comfortable while exploring.

December Average Humidity in Greencastle

This chart illustrates the average monthly humidity levels in Greencastle, 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 Greencastle is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%86%86%85%82%84%86%86%88%89%90%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Greencastle

In Greencastle 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 Greencastle.

Maximum UV Index Levels in Greencastle for December

The chart shows the monthly maximum UV Index (UVI) for Greencastle 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 Greencastle typically reaches 1, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124568875321
Data source: Greencastle 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 Greencastle Compares to Other Months

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

This table compares monthly weather conditions in Greencastle, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)106 mm (4.2 inches)87%low
February Weather6°C (44°F)135 mm (5.3 inches)86%low
March Weather7°C (44°F)123 mm (4.8 inches)86%moderate
April Weather8°C (47°F)61 mm (2.4 inches)85%moderate
May Weather10°C (51°F)79 mm (3.1 inches)82%high
June Weather12°C (54°F)114 mm (4.5 inches)84%very high
July Weather14°C (57°F)118 mm (4.7 inches)86%very high
August Weather14°C (58°F)165 mm (6.5 inches)86%high
September Weather13°C (56°F)125 mm (4.9 inches)88%moderate
October Weather11°C (53°F)169 mm (6.6 inches)89%moderate
November Weather9°C (49°F)150 mm (5.9 inches)90%low
December Weather8°C (46°F)163 mm (6.4 inches)86%low

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