Last updated: August 21, 2025
December in Saint Helier, Jersey is characterized by cool temperatures and a wet climate. With maximums reaching 14°C (57°F) and minimums dropping to around 3°C (38°F), the average temperature settles at a brisk 10°C (50°F). This month sees considerable precipitation, totaling 185 mm (7.3 in) over approximately 22 days, making it one of the wetter months of the year. The high humidity level, averaging around 92%, adds to the chill, inviting residents and visitors to embrace cozy indoor activities while enjoying the island's stunning coastal scenery shrouded in winter's grip.
As December settles over Saint Helier, temperatures begin to embrace the cooler side of the spectrum, with daily averages hovering around 10°C (50°F). The month kicks off with minimums averaging 3°C (38°F), which, while chilly, still allow for some invigorating outdoor activities. By day, highs reach a comfortable 14°C (57°F), providing a crisp but pleasant atmosphere ideal for strolling through the festive lights of the town. Compared to the preceding months, where November saw milder conditions, December brings a refreshing chill that signals the heart of winter, encouraging both locals and visitors to bundle up and enjoy the serene beauty of this island in its quieter season.
In December, Saint Helier experiences a significant uptick in precipitation, with 185 mm (7.3 in) of rainfall falling over 22 days. This marked increase in both volume and frequency signals the onset of winter, contrasting sharply with the lighter, drier months of summer and early autumn. Following a trend observed throughout the year, December's rain is the highest recorded, outpacing even the typically wet October and November. This consistent rainfall keeps the landscape vibrant and lush, providing a picturesque end to the year, even as residents make their way through the gloomier, gray skies that define the season. As temperatures dip and the weather turns more unpredictable, the robust precipitation levels in December serve as a reminder of Jersey's dynamic maritime climate.
In December, Saint Helier, Jersey, experiences a notable peak in humidity at 92%, mirroring the levels seen in November. This trend indicates a seasonal spike, as the months leading into winter showcase a consistent elevation in moisture content, starting from October's 89% and gradually rising. As the year progresses, humidity generally decreases, hitting a low of 69% in July and 80% in both May and June. However, the onset of winter brings a return to dampness, with the last few months consistently holding higher humidity levels, making December feel particularly clammy as the island transitions into its coldest season.
In Saint Helier, Jersey, the UV Index experiences a notable seasonal decline as the year wraps up in December, dropping to a low of 1. This translates into a relaxed atmosphere for those venturing outdoors, as the burn time extends to 45 minutes without serious risk. Analyzing the year, we see a trend where the UV Index peaks in the summer months of June and July, reaching a height of 9 and indicating a very high exposure category, which significantly reduces burn time to just 15 minutes. As the year progresses from the high indexes of spring and summer to the low levels of winter, it's essential to adapt your sun safety practices accordingly. For more details on the UV Index throughout the year, visit Saint Helier UV Index.
UV Risk Categories
In Saint Helier, Jersey, the charm of December unfolds with a modest 132 hours of sunshine, marking a subtle transition as the year draws to a close. This month, while cooler and cloudier, still offers a delightful contrast to the long, sun-filled days of summer, where July basked in an impressive 432 hours. Following a gradual decrease from late summer through autumn, December’s sunshine mirrors the patterns of the previous months, where we witness a vibrant peak in May and June before tapering off. The decreasing daylight serves as a gentle reminder of the seasonal ebb and flow, inviting residents and visitors to embrace the cozy allure of winter festivities amidst the soft glow of the sun.
As December arrives in Saint Helier, Jersey, the chances of sunny weather dwindle to 25%, marking a notable decline as the year comes to a close. This figure reflects a consistent downward trend from the early months, where the likelihood of sunshine starts at a 20% in January and gradually rises to a peak of 64% in April. However, as summer fades into autumn and winter approaches, the percentage of sunny days diminishes, with November already sitting at 32%. This seasonal shift emphasizes the transition into the colder months, leaving residents and visitors alike to appreciate the fleeting moments of sunshine that December may offer.
As the year draws to a close in Saint Helier, Jersey, December offers only 8 hours of daylight, mirroring the shorter days of January. This period marks the end of a gradual decline in sunlight that begins in October, where the days shrink from 10 hours down to this winter low. However, the transition towards longer days is just around the corner, with February promising an increase to 10 hours. The data reveals a clear trend: as the year progresses from March's 11 hours to the vibrant 15 hours of May, daylight peaks in the summer months of June and July at 16 hours and 15 hours respectively. Following this luminous stretch, daylight begins to recede again, culminating in December's cozy, yet brief, daylight experience, inviting reflection and warmth as the winter season embraces the island.
In Saint Helier, Jersey, December heralds a notable shift in the wind, boasting an average speed of 8.7 m/s (19 mph)—the highest of the year. This brisk breeze contrasts sharply with the gentler, more subdued winds of summer, which peak at just 6.2 m/s (14 mph) in August. As autumn transitions into winter, it becomes evident that the winds are not only picking up speed but also becoming more consistent, with November's winds tapering off at 6.7 m/s (15 mph). The sharp increase in December sets the stage for the more robust gusts of the coming winter months, inviting locals and visitors alike to bundle up and embrace the invigorating chill in the air.
Weather in Saint Helier varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Saint Helier, focusing on differences in temperature, rainfall, humidity, and UV levels.
In December, the weather tends to be slightly milder with average temperatures ranging from a minimum of 3°C (38°F) to a maximum of 14°C (57°F). This month also experiences higher rainfall, accumulating around 185 mm (7.3 in) over 22 days, along with high humidity at 92%. In contrast, January brings cooler averages, with temperatures ranging from 2°C (35°F) to 13°C (56°F) and significantly lower precipitation levels at 97 mm (3.8 in) across 14 days. The humidity remains relatively high but decreases slightly to 90%. Overall, January is characterized by slightly cooler temperatures and less rainfall compared to December. For more details, check out Saint Helier weather in January.
December and February present contrasting yet mild weather patterns, with December tending to be wetter and more humid. In December, temperatures range from a minimum of 3°C (38°F) to a maximum of 14°C (57°F), alongside a significant 185 mm (7.3 in) of precipitation over 22 days and high humidity at 92%. In contrast, February experiences cooler temperatures, with a minimum of -1°C (31°F) and a maximum of 13°C (56°F), while rainfall decreases to 90 mm (3.5 in) over 16 days and humidity settles at 89%. For more detailed information, you can check Saint Helier weather in February.
In December, Saint Helier experiences milder temperatures with an average of 10°C (50°F) and minimal fluctuations, while March sees a drop in minimum temperature to -2°C (29°F), although the average remains close at 9°C (48°F). December is characterized by higher humidity at 92%, along with significant precipitation, averaging 185 mm (7.3 in) over 22 days. In contrast, March has less rainfall, totaling 84 mm (3.3 in) across 15 days, and a slightly lower humidity level of 86%. For a detailed overview of the weather in March, visit Saint Helier weather in March.
In December, Saint Helier experiences cooler temperatures ranging from a minimum of 3°C (38°F) to a maximum of 14°C (57°F), with an average of 10°C (50°F). The month is characterized by high precipitation of 185 mm (7.3 in) spread over 22 days, resulting in a humidity level of 92%. In contrast, April sees slightly warmer weather, with temperatures starting at a minimum of 5°C (41°F) and reaching a maximum of 17°C (62°F), while maintaining the same average of 10°C (51°F). Rainfall significantly decreases to 36 mm (1.4 in) over just 8 days, and humidity drops to 84%. For more details, you can check Saint Helier weather in April.
In December, the weather is quite chilly with average temperatures ranging from a minimum of 3°C (38°F) to a maximum of 14°C (57°F). The month is also marked by significant precipitation, totaling 185 mm (7.3 in) over 22 days, and high humidity levels at 92%. In contrast, May brings milder conditions, with temperatures ranging from 7°C (46°F) to 20°C (69°F) and a much lower precipitation level of 63 mm (2.5 in) across just 10 days. The humidity in May is also more comfortable at 80%. For more details on the weather during this month, you can check out Saint Helier weather in May.
The weather in December is markedly cooler and wetter compared to June. In December, temperatures range from a chilly 3°C (38°F) to a mild 14°C (57°F), with a high average humidity of 92% and significant rainfall totaling 185 mm (7.3 in) over 22 days. In contrast, June brings much warmer temperatures, with lows around 11°C (53°F) and highs reaching up to 24°C (76°F), accompanied by considerably less precipitation of 71 mm (2.8 in) across just 10 days and a lower humidity level of 80%. Overall, December feels damp and cool while June offers a pleasant, warmer climate. For more specific insights, check out Saint Helier weather in June.
December and July present starkly contrasting weather conditions. In December, temperatures are generally cooler, with a minimum of 3°C (38°F) and an average of 10°C (50°F), while July enjoys milder weather with a minimum of 14°C (58°F) and an average of 17°C (63°F). Precipitation is significantly higher in December, with 185 mm (7.3 in) falling over 22 days, compared to July's 47 mm (1.9 in) over just 9 days. Additionally, humidity levels are noticeably higher in December at 92%, compared to 69% in July, creating a more comfortable atmosphere during the summer month. For more insights on July's weather, you can refer to Saint Helier weather in July.
In December, the weather is considerably cooler compared to August, with average temperatures ranging from a minimum of 3°C (38°F) to a maximum of 14°C (57°F). The month is also characterized by high precipitation, totaling 185 mm (7.3 in) over approximately 22 days, and a high humidity level of 92%. In contrast, August sees warmer temperatures, with averages between 14°C (57°F) and 25°C (78°F), and experiences significantly less rain, only 66 mm (2.6 in) over 13 days, along with a lower humidity level of 73%. For more information on the specific weather patterns and temperatures in August, you can visit Saint Helier weather in August.
December weather is significantly cooler and wetter than September. While September enjoys mild temperatures with a minimum of 12°C (54°F) and an average of 17°C (63°F), December's temperatures drop sharply, with a minimum of just 3°C (38°F) and an average around 10°C (50°F). Additionally, December is marked by higher precipitation, averaging 185 mm (7.3 in) over 22 days, compared to September's 82 mm (3.2 in) spread over only 11 days. Humidity levels also differ, with December reaching a high of 92%, versus September's more moderate 79%. For more details, you can visit Saint Helier weather in September.
In comparing the weather between December and October, it's clear that December tends to be cooler and wetter. In December, the average temperature hovers around 10°C (50°F), with minimums dropping to 3°C (38°F) and maximums reaching up to 14°C (57°F). The month also sees significant precipitation, with 185 mm (7.3 in) spread across 22 days, and a high humidity level of 92%.
In contrast, October offers milder temperatures, averaging 15°C (59°F), with lows of 9°C (48°F) and highs peaking at 20°C (69°F). The rainfall is slightly less in October, totaling 157 mm (6.2 in) over 19 days, and exhibiting a lower humidity at 89%. For a more detailed look at the October weather, you can explore Saint Helier weather in October. Overall, October is typically more pleasant than the cooler, wetter December.
December typically experiences cooler temperatures compared to November, with average highs of 14°C (57°F) dropping from November's 17°C (62°F). The minimum temperatures in December are also lower, averaging 3°C (38°F), in contrast to November's minimum of 5°C (41°F). Precipitation increases significantly in December, reaching 185 mm (7.3 in) over 22 days, compared to November's 125 mm (4.9 in) over 18 days. Despite the differences in temperature and rainfall, both months share high humidity levels of 92%. For more detailed information, visit Saint Helier weather in November.
As December settles in Saint Helier, the weather shifts significantly, embodying the chill of winter. With average temperatures hovering around 10°C (50°F), residents can expect a notable drop compared to the warmer months. Precipitation becomes more frequent, with 22 days seeing rainfall, contributing to a humid atmosphere that often reaches 92%. This month ushers in a cozy, if slightly damp, ambiance perfect for enjoying the festive season. For a deeper look into what to expect year-round, check out Saint Helier Climate.