December Weather in Porthmadog, United Kingdom

Last updated: March 17, 2025

December in Porthmadog, United Kingdom, offers a chilly experience with temperatures ranging from a minimum of -2°C (29°F) to a maximum of 12°C (54°F). The average temperature hovers around 7°C (45°F), providing a brisk backdrop for the month. With 203 mm (8.0 in) of precipitation spread over 24 days, visitors can expect frequent rainfall, and the air maintains a notably high humidity of 89%. This combination of cool temperatures and persistent moisture creates a quintessentially wintery atmosphere, perfect for experiencing the natural beauty of this picturesque coastal town.

December Temperature in Porthmadog

In December, Porthmadog, United Kingdom, experiences a noticeable dip in temperatures as winter settles in. The average temperature hovers around 7°C (45°F), with a minimum of -2°C (29°F) and a maximum reaching 12°C (54°F). This marks a transition towards colder weather, especially when compared to the milder autumn months, where November's averages lingered around 8°C (48°F). As the year draws to a close, residents can expect brisk, chilly days that signal the heart of winter, setting the stage for cozy indoor gatherings while highlighting the beauty of the season's crisp air.

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

The chart illustrates December temperature patterns in Porthmadog, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec424344475257605957524744
Data source: Temperature data for Porthmadog 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 Porthmadog

In December, Porthmadog experiences a notable increase in precipitation, with 203 mm (8.0 in) of rain falling over an average of 24 days. This marks a peak in the annual rainfall, reflecting the region's transition into winter. Following November's 176 mm, December's figures underscore a trend of heightened moisture in the latter part of the year, a pattern driven by Atlantic weather systems. The extensive number of rainy days not only emphasizes the dampness of the season but also enriches the landscape, making it a vibrant time for Porthmadog's natural beauty. This consistent rainfall lays a strong foundation for the coming months, as the region prepares for the challenges of winter weather.

December Precipitation Trends in Porthmadog

The chart displays monthly precipitation patterns in Porthmadog, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1211621526287106105162146206176203
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Porthmadog

December in Porthmadog, United Kingdom, wraps up the year with a humidity level of 89%, indicative of a season characterized by dampness. This month follows a trend of high humidity that begins in the late autumn, peaking in November at 91%. As the year transitions into winter, humidity remains relatively stable, showcasing a slight decrease from the preceding month but still reflecting the generally moist climate of the region. The pattern throughout the year highlights a gradual decline in humidity through the spring and summer months, reaching its lowest in July at 78%, before creeping back up as the cooler months approach. Thus, December's humidity level mirrors the originality of Porthmadog's weather: cool and humid, perfect for cozy indoor gatherings while enjoying the picturesque winter scenery.

December Average Humidity in Porthmadog

This chart illustrates the average monthly humidity levels in Porthmadog, 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.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%86%85%79%81%78%79%85%90%91%89%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Porthmadog

As December rolls into Porthmadog, the UV Index drops back to 1, indicating a low exposure category and a burn time of 45 minutes. This marks a return to the more subdued levels seen in the earlier winter months of January and November. Throughout the year, the UV Index fluctuates significantly, peaking at 8 in the summer months of June and July, when sun protection becomes crucial with a burn time reduced to just 15 minutes. As we move back into the winter season, residents and visitors can enjoy longer outdoor activities without the immediate concern of sunburn, highlighting a seasonal trend where UV levels are considerably lower. For more detailed insights on UV exposure throughout the year, check out the full guide on Porthmadog UV Index.

Maximum UV Index Levels in Porthmadog for December

The chart shows the monthly maximum UV Index (UVI) for Porthmadog 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.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Porthmadog 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 Porthmadog

In Porthmadog, United Kingdom, December brings a gentle decline in sunshine hours, averaging around 109 hours for the month. As the year draws to a close, this marks a stark contrast to the sun-drenched summer months, where July shines brightest with an impressive 421 hours of sunlight. Notably, it follows a steady decrease from the peak of spring and summer, starting from 415 hours in May and gradually falling through the autumn months. Despite the chill, December’s modest light still offers a cozy appeal, inviting locals and visitors alike to embrace the unique charm of the winter landscape. As the year transitions, the gradual fade of daylight serves as a reminder of the cyclical beauty of the seasons in this captivating coastal town.

Monthly Sunshine Duration in Porthmadog: December Highlighted

The December sunshine duration represents the total number of hours Porthmadog 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.
JanFebMarAprMayJunJulAugSepOctNovDec93h162h228h335h415h404h421h383h315h238h126h109h
Data source: Porthmadog December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Porthmadog During December

In Porthmadog, December sees a 20% chance of sunny weather, which aligns with the city's generally overcast winter months. This figure mirrors the probabilities found in January and November, indicating a consistent pattern of limited sunshine as the year draws to a close. As the seasons transition from autumn to winter, the likelihood of clear skies doesn't improve, with only a modest increase observed during the spring months, particularly in April when sunny chances rise to 46%. Overall, December's weather continues the trend of lower sunshine probabilities, inviting residents to embrace the cozy charm of this coastal town during the darker days of winter.

Percentage of Sunny Days in December in Porthmadog

The chart illustrates the percentage of sunny days in Porthmadog 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 Porthmadog experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec20%22%25%46%30%27%36%25%22%16%20%20%
Data source: Porthmadog December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Porthmadog in December

As the year unfolds in Porthmadog, United Kingdom, daylight duration undergoes a captivating transformation. Starting with 8 hours in January, the days progressively lengthen, peaking at a glorious 16 hours in June and July, enchanting residents with ample sunlight. This vibrant stretch gives way to a gradual decline as summer fades, with daylight dwindling to 14 hours in August and retreating to 12 hours by September. The transition deepens in the autumn months, where October offers 10 hours before November mirrors January with only 8 hours of daylight. December sees a further drop to a serene 7 hours, marking the shortest days of the year. This annual rhythm not only influences the lifestyle of Porthmadog's inhabitants but also creates a rich tapestry of light and shadow throughout the seasons.

Average Daylight Hours in Porthmadog for December

The chart illustrates the variation in daylight duration in Porthmadog throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec8h 10m9h 51m11h 54m14h15h 51m16h 50m16h 18m14h 38m12h 36m10h 31m8h 38m7h 37m
Data source: Porthmadog daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Porthmadog

As December arrives in Porthmadog, the wind begins to pick up slightly, with an average speed of 5.9 m/s (13 mph). This marks a noticeable increase from the calmer summer months, where winds were at their lowest in July at 3.2 m/s (7 mph). Compared to the earlier months of the year, December's winds are relatively lively, only slightly softer than the brisk autumn breezes recorded in October and November. Throughout the year, wind patterns showcase a sense of seasonality, with the gentlest zephyrs of spring giving way to the invigorating gusts of late fall and winter. Overall, December's winds play a crucial role in shaping the coastal atmosphere, offering both a refreshing chill and a dynamic backdrop for the stunning scenery of this picturesque town.

Average December Wind Speed in Porthmadog

The chart displays monthly wind speed patterns in Porthmadog, 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.
JanFebMarAprMayJunJulAugSepOctNovDec5.36.65.73.84.74.03.24.43.76.45.55.9 m/s
Data source: Porthmadog December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Porthmadog Compares to Other Months

The weather in Porthmadog 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 Porthmadog and find detailed weather information for every month.

When comparing the weather in December and January, both months experience relatively mild conditions, but January tends to be slightly warmer and drier. In December, temperatures range from a minimum of -2°C (29°F) to a maximum of 12°C (54°F), with an average temperature of 7°C (45°F). The month is quite wet, receiving 203 mm (8.0 in) of precipitation over 24 days, while humidity remains high at 89%.

In contrast, January sees a marginally warmer temperature range, with a minimum of -1°C (30°F) and a maximum of 13°C (55°F), averaging 6°C (43°F). Precipitation drops significantly to 121 mm (4.8 in) over just 16 days, while humidity remains stable at 89%. For a more detailed look at January weather, you can visit Porthmadog weather in January.

December and February exhibit notable differences in weather patterns. In December, temperatures range from a minimum of -2°C (29°F) to a maximum of 12°C (54°F), with an average of 7°C (45°F). The month experiences significant precipitation, totaling 203 mm (8.0 in) over 24 days, and humidity remains high at 89%. In contrast, February sees slightly colder temperatures, with a minimum of -3°C (28°F) and a maximum of 15°C (60°F), yielding a similar average of 6°C (43°F). Precipitation decreases to 162 mm (6.4 in) over 19 days, while humidity hovers around 88%. For a more detailed look at February weather patterns, you can visit Porthmadog weather in February.

December and March showcase distinct weather patterns, reflecting the transition from the harshness of winter to the beginnings of spring. In December, temperatures range from a chilly -2°C (29°F) to a mild 12°C (54°F), with an average of 7°C (45°F). The month is characterized by high precipitation, totaling 203 mm (8.0 in) over 24 days, alongside a humidity level of 89%. In contrast, March experiences slightly colder minimum temperatures at -5°C (23°F), but a higher maximum of 16°C (61°F) with the same average of 7°C (44°F). Precipitation decreases to 152 mm (6.0 in) over 19 days, with humidity slightly lower at 86%. For more details on March weather, you can check Porthmadog weather in March.

In December, the weather is notably colder with average temperatures ranging from -2°C (29°F) to a maximum of 12°C (54°F). The month is characterized by high precipitation, accumulating 203 mm (8.0 in) over approximately 24 days, alongside high humidity levels of 89%. In contrast, April sees a mild improvement in conditions, with temperatures starting at 0°C (33°F) and peaking at 19°C (66°F) for an average of 8°C (47°F). Precipitation in April is significantly lower at 62 mm (2.4 in) over just 12 days, and the humidity decreases slightly to 84%. For a more detailed overview, you can check Porthmadog weather in April.

December weather is characterized by colder temperatures, with averages ranging from a minimum of -2°C (29°F) to a maximum of 12°C (54°F). The month also sees considerable precipitation, totaling 203 mm (8.0 in) over 24 days, and a high humidity level of 89%. In contrast, May brings milder and more pleasant conditions, with temperatures ranging from a minimum of 2°C (36°F) to a maximum of 23°C (73°F). Precipitation is significantly lower at 87 mm (3.4 in) over just 12 days, and humidity drops to around 79%. Overall, while December is marked by cold and damp conditions, May offers a warmer and more inviting atmosphere, making it a great time to enjoy outdoor activities. For more details on May weather, you can check Porthmadog weather in May.

December and June present a stark contrast in weather conditions. In December, temperatures range from a chilly -2°C (29°F) at night to a mild 12°C (54°F) during the day, with an average temperature of 7°C (45°F). The month is characterized by high humidity at 89% and significant precipitation, totaling 203 mm (8.0 in) over 24 days. Conversely, June experiences warmer temperatures, with minimums of 7°C (46°F) and maximums reaching 26°C (79°F), averaging 14°C (57°F). Rainfall is less frequent in June, with a total of 106 mm (4.2 in) across just 16 days, accompanied by slightly lower humidity at 81%. For a detailed overview of Porthmadog's June weather, check out Porthmadog weather in June.

When comparing the weather in December and July, it's evident that the two months exhibit striking differences. December’s temperatures range from a chilly -2°C (29°F) to a mild 12°C (54°F), while July enjoys much warmer conditions, with temperatures fluctuating between 9°C (48°F) and a high of 25°C (77°F). Additionally, December is characterized by higher humidity at 89%, accompanied by 203 mm (8.0 in) of precipitation spread over 24 days, making it a notably wetter month. In contrast, July sees significantly lower precipitation at 105 mm (4.1 in) over just 15 days and a humidity level of 78%, resulting in a drier and more comfortable atmosphere. For a closer look at July's conditions, you can check out Porthmadog weather in July.

The weather in December contrasts sharply with that of August. In December, temperatures can dip as low as -2°C (29°F) with an average of 7°C (45°F) and a maximum of 12°C (54°F). The month is characterized by high humidity at 89% and considerable precipitation, with 203 mm (8.0 in) falling over 24 days. In contrast, August offers a much milder climate, with temperatures ranging from a minimum of 9°C (49°F) to a comfortable maximum of 24°C (75°F) and an average of 15°C (60°F). The precipitation is somewhat lower at 162 mm (6.4 in) over 22 days, accompanied by decreased humidity at 79%. For more insights, you can view Porthmadog weather in August.

When comparing the weather between September and December, it's evident that September offers milder temperatures, with average highs reaching up to 26°C (78°F) and minimums around 6°C (42°F). In contrast, December experiences much cooler conditions, where temperatures range from a minimum of -2°C (29°F) to an average of 7°C (45°F) and a maximum of 12°C (54°F). Additionally, precipitation in December is more considerable, with 203 mm (8.0 in) falling over 24 days, compared to September's 146 mm (5.7 in) over 18 days. While both months have high humidity levels, December is slightly more humid at 89% compared to September's 85%. For more detailed information on September weather, you can check this link: Porthmadog weather in September.

In comparing December and October weather, December typically experiences colder temperatures with a minimum of -2°C (29°F) and an average of 7°C (45°F), while October sees milder conditions, ranging from a minimum of 1°C (33°F) to an average of 11°C (53°F) and a higher maximum of 20°C (68°F). Although both months have similar precipitation levels, with December receiving 203 mm (8.0 in) over 24 days and October slightly higher at 206 mm (8.1 in) over 22 days, December's increased humidity at 89% contributes to a chillier feel. For more detailed insights on October's weather, visit Porthmadog weather in October.

December weather is characterized by colder temperatures, with a minimum of -2°C (29°F) and an average of 7°C (45°F), compared to November's milder minimum of 1°C (34°F) and average of 8°C (48°F). Additionally, December experiences more precipitation, totaling 203 mm (8.0 in) over 24 days, compared to November's 176 mm (6.9 in) over 21 days. Humidity levels are slightly lower in December at 89%, down from November's 91%. For a closer look at how the weather changes in the month preceding December, you can refer to Porthmadog weather in November.

Compare Porthmadog's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Porthmadog

December in Porthmadog brings a unique blend of chilly temperatures and high humidity, setting it apart from the milder months of the year. With frequent rainfall over nearly 24 days and an average temperature hovering around 7°C (45°F), the month tends to feel particularly damp and cool. Unlike the warmer seasons, where sunshine breaks through more often, December's consistent precipitation and 89% humidity create a cozy yet brisk atmosphere, perfect for enjoying the festive spirit. For a comprehensive overview of the climate patterns in this charming locale, explore Porthmadog Climate.