December Weather in Castlewellan, United Kingdom

Last updated: March 17, 2025

December in Castlewellan, United Kingdom, is characterized by a cool and damp climate, with maximum temperatures reaching up to 13°C (55°F) and an average of 7°C (44°F). The minimum temperatures can drop to 0°C (32°F), making warm attire essential for outdoor activities. This month sees significant precipitation, totaling 104 mm (4.1 in) over approximately 14 days, resulting in an humidity level of 86% that adds to the chilly atmosphere. Visitors are encouraged to embrace this season's charm, as the lush, green landscapes and picturesque surroundings transform into a winter wonderland.

December Temperature in Castlewellan

As December settles over Castlewellan, the temperatures reflect the transition into winter, with minimums dipping to 0°C (32°F) and averages hovering around 7°C (44°F). This month sees a slight chill compared to the milder autumn, yet it remains relatively mild compared to the coldest winter months ahead. While maximum temperatures reach a comfortable 13°C (55°F), the overall trend indicates a gradual descent into colder weather, following the pattern set by previous months. The shift is subtle but marks a seasonal change, where cozy indoor activities begin to flourish, complemented by the picturesque winter landscape that envelops this enchanting part of the United Kingdom.

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

The chart illustrates December temperature patterns in Castlewellan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec434344475257605956524744
Data source: Temperature data for Castlewellan generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Castlewellan

December in Castlewellan, United Kingdom, offers a notable snapshot of seasonal precipitation patterns. With 104 mm (4.1 in) of rain spread over 14 days, December maintains a consistent level of moisture, mirroring the similarly wet conditions of November. This trend of elevated precipitation in the colder months suggests a shift from the relatively drier spring and summer periods. The winter months, especially from October through December, are characterized by higher rainfall, as temperatures drop and the landscape becomes lush and vibrant with the winter rains. December thus closes the year with a robust watering, ensuring the region's natural beauty remains vibrant as it heads into the new year.

December Precipitation Trends in Castlewellan

The chart displays monthly precipitation patterns in Castlewellan, 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.
JanFebMarAprMayJunJulAugSepOctNovDec6899924766788512083104113104
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Castlewellan

As December settles in Castlewellan, the humidity remains relatively high at 86%, consistent with the preceding months. This period reflects a subtle but noticeable trend, where humidity tends to peak as the year draws to a close, culminating in November's peak at 90%. Following this, December experiences a slight dip but still retains a humid atmosphere, which is typical for winter in this region. The overall pattern shows a gradual decline in humidity from January's steep levels, which range from a consistent 87% down to 82% in May, before fluctuating in the latter half of the year. From September to November, humidity levels rise again, further establishing December as a month of noticeable moisture and chill in Castlewellan, making it a key time for embracing the crisp winter air.

December Average Humidity in Castlewellan

This chart illustrates the average monthly humidity levels in Castlewellan, with December's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how December's humidity levels compare to other months.
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 Castlewellan

As December arrives in Castlewellan, the UV Index drops to 1, signaling a period of minimal sun exposure risk. With a low exposure category and a comfortable burn time of 45 minutes, residents can enjoy the outdoors without the same concerns that come with the brighter months. This is a noticeable shift from the peak summer months, where the UV Index soared to 8 in June and July, requiring more vigilant sun protection. The trend reveals a gradual decrease in UV levels as we transition from the high summer to the cooler winter months, with December standing out as a time for worry-free enjoyment of the fresh air. For more information on UV levels throughout the year, visit Castlewellan UV Index.

Maximum UV Index Levels in Castlewellan for December

The chart shows the monthly maximum UV Index (UVI) for Castlewellan 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.
JanFebMarAprMayJunJulAugSepOctNovDec124578865321
Data source: Castlewellan 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.

December Sunshine in Castlewellan

In Castlewellan, United Kingdom, December tends to be one of the more subdued months for sunshine, yielding only 87 hours of bright light. This follows a typical pattern observed throughout the year, where sunlight peaks during the spring and summer months. From a mere 81 hours in January to a stunning 403 hours in May, the transition is gradual, as longer days and brighter skies take hold. However, as autumn sets in, the hours begin to dwindle again, with November offering just 115 hours before plunging to December’s dreariness. Yet, even in the depths of winter, Castlewellan’s charm shines through, inviting visitors to embrace its serene beauty, despite the limited sunlight.

Monthly Sunshine Duration in Castlewellan: December Highlighted

The December sunshine duration represents the total number of hours Castlewellan experiences direct sunlight during the month of December, excluding cloudy or obstructed periods. This chart compares the sunshine duration of December with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec81h150h209h322h403h394h399h349h295h232h115h87h
Data source: Castlewellan December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Castlewellan During December

When considering the likelihood of sunny weather in December in Castlewellan, United Kingdom, trends indicate a notable decline in sunshine compared to other months. With a mere 16% chance of sunny days, December ranks among the lowest in the yearly cycle, particularly following the more promising months of spring and early autumn, where the sunshine chances hover between 21% to 43%. As winter approaches, the dreariness sets in, with December trailing behind even the typically overcast months of October and November, both of which hold 19% and 23% likelihoods, respectively. This pattern suggests that while Castlewellan enjoys brighter spells earlier in the year, December brings the stark reality of shorter days and increased gloom.

Percentage of Sunny Days in December in Castlewellan

The chart illustrates the percentage of sunny days in Castlewellan throughout the year, with December highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Castlewellan experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec28%22%21%43%35%24%32%23%21%19%23%16%
Data source: Castlewellan December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Castlewellan in December

In Castlewellan, United Kingdom, December marks a return to the shorter days, with daylight lasting around 7 hours. As the year winds down, this trend of decreasing daylight continues from November, which offered a mere hour extra. However, this pattern also reflects the natural progression throughout the year, where winter's grip tightens after the lush, longer days of summer. From June's peak of 17 hours, daylight gradually lessens, revealing a rhythmic cycle of seasons that shapes the local landscape and lifestyle. As December arrives, the community embraces the cozy charm of shorter days, hinting at the hope of longer daylight as the new year approaches.

Average Daylight Hours in Castlewellan for December

The chart illustrates the variation in daylight duration in Castlewellan throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec7h 58m9h 45m11h 54m14h 6m16h 3m17h 5m16h 31m14h 46m12h 38m10h 27m8h 28m7h 24m
Data source: Castlewellan daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Castlewellan

As December arrives in Castlewellan, the wind begins to pick up, with an average speed of 5.6 m/s (13 mph), slightly higher than the preceding months. This increase follows a trend of gradually rising wind speeds after the summer lull, where July and August saw the calmest breezes. The autumn months brought back more lively winds, with November's average getting close to December's. This shift towards brisker winds signals the onset of winter, infusing the quaint town with a refreshing chill and a sense of seasonal change. With each gust, the picturesque landscapes of Castlewellan are animated, inviting residents and visitors alike to embrace the beauty of a wind-swept December.

Average December Wind Speed in Castlewellan

The chart displays monthly wind speed patterns in Castlewellan, with values for each month shown alongside December's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how December's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec5.06.95.33.94.44.22.93.73.95.45.55.6 m/s
Data source: Castlewellan December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Castlewellan Compares to Other Months

The weather in Castlewellan changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of December's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Castlewellan and find detailed weather information for every month.

In December, the weather is characterized by milder temperatures, with an average of 7°C (44°F) and a maximum of 13°C (55°F), while January sees a slight dip, with an average of 6°C (43°F) and a minimum of -2°C (29°F). Precipitation in December is higher at 104 mm (4.1 in) across 14 days compared to January's 68 mm (2.7 in) over 12 days. Humidity remains slightly elevated in both months, with December at 86% and January at 87%. For a detailed look at January's weather, you can visit Castlewellan weather in January.

In comparing the weather of December and February, both months exhibit cool temperatures and high humidity levels of 86%. December typically brings slightly milder conditions with an average temperature of 7°C (44°F) and maximums reaching up to 13°C (55°F). In contrast, February experiences a marginally colder climate, with average temperatures around 6°C (43°F) and minimums dipping slightly to -1°C (31°F). Precipitation is somewhat similar, with December receiving 104 mm (4.1 in) over 14 days, while February sees 99 mm (3.9 in) spread out over 17 days. For more detailed insights on February weather specifics, you can visit Castlewellan weather in February.

In December, the weather is typically cooler, with temperatures ranging from a minimum of 0°C (32°F) to a maximum of 13°C (55°F). The month averages about 7°C (44°F) and experiences considerable precipitation of 104 mm (4.1 in) over approximately 14 days, maintaining high humidity levels at 86%. In contrast, March begins to show signs of spring, with temperatures dipping slightly lower, featuring a minimum of -3°C (27°F) and a maximum of 14°C (58°F), while still averaging 7°C (44°F). Precipitation during March is slightly reduced to 92 mm (3.6 in), occurring over 16 days, but the humidity remains constant at 86%. For a detailed overview of March conditions, you can check Castlewellan weather in March.

In December, temperatures range from a chilly minimum of 0°C (32°F) to a maximum of 13°C (55°F), with an average of 7°C (44°F). This month typically experiences more significant precipitation, with 104 mm (4.1 in) falling over 14 days, and the humidity sits at a high 86%. In contrast, April brings slightly milder temperatures, with a minimum of 0°C (32°F) and a maximum of 16°C (61°F), averaging 8°C (47°F). Precipitation in April is notably lower at 47 mm (1.8 in) over just 9 days, and the humidity remains comparable at 85%. For more detailed insights on weather conditions, you can check Castlewellan weather in April.

In December, the weather is colder, with temperatures ranging from a minimum of 0°C (32°F) to a maximum of 13°C (55°F) and an average of 7°C (44°F). The month experiences significant precipitation, totaling 104 mm (4.1 in) over about 14 days, accompanied by a high humidity level of 86%. In contrast, May sees a considerable improvement in temperatures, with a minimum of 2°C (35°F), an average of 11°C (52°F), and a maximum of 19°C (67°F). Precipitation is lower in May at 66 mm (2.6 in) over 12 days, and humidity slightly decreases to 82%, making it a more pleasant month overall. For specific details, you can visit Castlewellan weather in May.

In December, temperatures range from a chilly 0°C (32°F) at night to a mild 13°C (55°F) during the day, with an average around 7°C (44°F). The month sees significant precipitation, totaling 104 mm (4.1 in) across 14 days, and the humidity is relatively high at 86%. In contrast, June provides a more pleasant climate with temperatures starting at a minimum of 7°C (44°F) and peaking at 24°C (75°F), averaging around 14°C (57°F). The precipitation is lower at 78 mm (3.1 in) over the same number of days, while humidity drops slightly to 84%. For more insights on the June climate, check out Castlewellan weather in June.

When comparing the weather in December and July, a stark contrast emerges. December's temperatures range from a chilly minimum of 0°C (32°F) to a maximum of 13°C (55°F), with an average of 7°C (44°F). In this month, Castlewellan experiences significant precipitation, totaling 104 mm (4.1 in) over 14 days, while the humidity remains high at 86%. In contrast, July offers a milder climate, with temperatures ranging from a minimum of 9°C (48°F) to a maximum of 24°C (76°F) and an average of 15°C (60°F). Rainfall decreases slightly to 85 mm (3.3 in) over the same number of days, with humidity levels remaining consistent at 86%. For more details on the weather during that time, check out Castlewellan weather in July.

In December, temperatures range from a chilly 0°C (32°F) to a maximum of 13°C (55°F), with an average of 7°C (44°F). The month is characterized by substantial precipitation of 104 mm (4.1 in) spread over 14 days, and high humidity levels at 86%. In contrast, August offers milder temperatures, with a minimum of 9°C (48°F) and a maximum reaching 21°C (69°F), averaging 15°C (59°F). Although August experiences slightly more rainfall at 120 mm (4.7 in) over 18 days, the humidity remains the same at 86%. For more specific details on August weather, you can visit Castlewellan weather in August.

December weather typically features cooler temperatures, with a minimum of 0°C (32°F) and an average of 7°C (44°F), compared to September, where temperatures start at a minimum of 5°C (41°F) and can reach an average of 13°C (56°F). Additionally, December sees higher total precipitation at 104 mm (4.1 in) over 14 days, while September experiences 83 mm (3.3 in) across 16 days, indicating somewhat drier conditions despite having more rainy days. Humidity levels are relatively similar, with December at 86% and September slightly higher at 88%. For a closer look at the weather specifics for September, check out Castlewellan weather in September.

When comparing the weather in December and October, December tends to be cooler, with average temperatures ranging from a minimum of 0°C (32°F) to a maximum of 13°C (55°F), while October experiences milder temperatures, averaging between 2°C (37°F) and 18°C (64°F). Interestingly, both months receive a similar amount of precipitation, totaling 104 mm (4.1 in), but October spreads this over 17 days compared to December's 14 days of rainfall. Humidity levels are also slightly higher in October at 89%, compared to 86% in December. For a more detailed look at the October weather, you can visit Castlewellan weather in October.

In comparing December and November weather, December tends to be slightly colder with average temperatures ranging from a minimum of 0°C (32°F) to a maximum of 13°C (55°F), whereas November has a higher average with minimums at 1°C (34°F) and maximums at 14°C (58°F). Precipitation is also notable, with December experiencing 104 mm (4.1 in) over 14 days, compared to November's 113 mm (4.5 in) across 16 days. Humidity levels in December average around 86%, slightly lower than November's 90%. For more detailed insights on November weather, you can check out Castlewellan weather in November.

Compare Castlewellan's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Castlewellan

As December unfolds in Castlewellan, the weather takes a notable turn towards chillier conditions, with temperatures dipping significantly compared to the milder months preceding it. This month typically features a blend of cool days and longer nights, characterized by higher humidity levels and increased precipitation. While the landscape may be adorned with a soft curtain of rain, the festive spirit remains undampened. For those seeking to understand the full scope of Castlewellan's seasonal variations, a deep dive into the local climate is essential. Explore more about it at Castlewellan Climate.