Last updated: March 17, 2025
January in Castlerock, United Kingdom, brings a blend of cool temperatures and frequent precipitation. With maximum temperatures reaching around 13°C (56°F) and an average hovering at 7°C (45°F), the month can feel brisk, especially with minimums dipping to 2°C (36°F). Rain is a perennial feature during this time, as evidenced by an impressive 109 mm (4.3 in) of total precipitation over 17 days, resulting in a high humidity level of 87%. Visitors and locals alike should be prepared for a rather damp start to the year, making it an ideal time for indoor activities and enjoying the cozy ambiance of Castlerock.
In January, Castlerock, United Kingdom, experiences a chill with temperatures ranging from a minimum of 2°C (36°F) to a comfortable maximum of 13°C (56°F), averaging around 7°C (45°F). This pattern reflects a generally cool winter climate, but as the month progresses into February, we see a slight dip, with minimum temperatures falling to 1°C (34°F). The averages remain steady, showcasing the stability of winter, before transitioning into the colder temperatures of March, where the minimum dips to -1°C (31°F). However, as spring approaches in April and May, temperatures gradually rise, bringing warmer days with averages of 8°C (47°F) and 10°C (50°F), respectively. The progression into summer reveals a significant warming trend, peaking in July and August with average temperatures around 14°C (57°F), inviting more outdoor activities. As the year winds down, September to December see a return to the cooler climate, yet still remain milder compared to the depths of winter, indicating a smooth seasonal transition that keeps the charm of Castlerock intact year-round.
In January, Castlerock, United Kingdom, experiences a significant amount of rainfall, receiving 109 mm (4.3 in) over approximately 17 days. This sets the tone for the early winter months, as precipitation begins to rise notably in February, with 132 mm (5.2 in) over 18 days, continuing a pattern of wet weather. March maintains a similar rhythm, yielding 112 mm (4.4 in) of rain, yet as the seasons transition, April introduces a welcome decrease to 55 mm (2.2 in). This fluctuation suggests a trend of heavier rains early in the year, with consistently higher precipitation levels in the winter and early spring compared to the drier late spring and summer months. The gradual increase through to the autumn months culminates in October's peak at 161 mm (6.3 in), indicating a cyclical pattern of rainfall that dramatically affects the region’s lush, green landscape.
In January, Castlerock, United Kingdom, experiences a notably high humidity level of 87%, setting the tone for a rather moist winter. This initial surge gradually gives way to slightly lower levels in February and March, both at 86%, before dipping further to 85% in April. As the spring progresses into May, humidity continues to decline, reaching 82%, suggesting a transition towards drier conditions. Interestingly, the summer months see a modest increase, with humidity sitting at 84% in June and returning to 86% in July and August. As autumn sets in, humidity begins to rise again, peaking at 90% in November. Overall, the trends highlight a pattern of relatively high humidity throughout the year, often reaching its zenith in the cooler months, while the summer offers a brief respite.
In Castlerock, United Kingdom, January brings a notably low UV Index of 1, indicating minimal risk of harm from unprotected sun exposure, with a burn time of approximately 45 minutes. As the year progresses into February, the UV Index slightly increases to 2, but the exposure category remains low, maintaining the same burn time. The real shift occurs in March, when the UV Index rises to a moderate level of 3, which reduces the safe sun exposure time to 30 minutes. Notably, April sees the UV Index increase further to 5, transitioning into a higher exposure category, while May experiences a peak at 6, classifying sun exposure as high-risk and shortening burn time to just 25 minutes. Early summer months, particularly June and July, reach the very high category at 8, necessitating swift actions to limit sun exposure to only 15 minutes. As the year progresses into late summer and autumn, the UV Index gradually declines, settling back to moderate levels by September and then to low risks in November and December, cycling back to the 45 minutes burn time seen at the year's start. This seasonal variation highlights the importance of staying sun safe throughout the year. For more detailed information, you can explore the Castlerock UV Index.
UV Risk Categories
January in Castlerock, United Kingdom, welcomes the year with a modest 72 hours of sunshine, marking the beginning of a gradual increase in daylight. As winter wanes, February shines a bit brighter with 146 hours, hinting at the promise of spring. By March, sunshine climbs to 207 hours, and the warming embrace continues into April with a remarkable 319 hours. This upward trend peaks in May, where residents enjoy an impressive 405 hours of sunlight, setting the stage for a vibrant summer. The sun remains bountiful through July with 404 hours, but as August resets to 357 hours, a subtle shift begins. The days shorten significantly in September, dropping to 283 hours, and the gradual retreat continues into the fall and winter months, with November and December seeing just 117 and 81 hours respectively. Overall, Castlerock's sunshine story is one of transition, blossoming from the dark winter months into a radiant spring and summer, before folding back into the quiet of late autumn and winter.
In Castlerock, United Kingdom, January brings a modest 23% chance of sunny weather, making it one of the brighter months in the winter season. While the likelihood of sun slightly creeps up to 25% in February, it eventually dips in March to 15%, reflecting the typically cloudier spring transition. This trend alters dramatically as spring advances, with April enjoying a sharper rise to 43%, signaling the onset of sunnier days. Interestingly, the summer months oscillate around the 20-25% range, suggesting that while the sun is often sought, it remains an unpredictable guest on the stage of the British weather. Overall, January's sun chances set the tone for a winter marked by occasional brightness, hinting at the warmth that lies ahead.
In Castlerock, United Kingdom, the transition from January to the following months showcases a remarkable increase in daylight, starting with just 7 hours in January. As February approaches, daylight begins to lengthen to 9 hours, paving the way for the promise of spring. By March, the days grow longer still, reaching 11 hours, and this upward trend continues through April and May, where daylight peaks at an impressive 16 hours. The longest days arrive in June with 17 hours of sunlight, creating a vibrant atmosphere perfect for outdoor pursuits. However, as summer wanes, the daylight gradually diminishes, with July retaining 16 hours before tapering to 14 hours in August and further down to 12 hours in September. The descent into autumn brings shorter days, wrapping up the year with 10 hours in October, and returning to the 7 hours of daylight seen in January by December. This rhythmic cycle of daylight not only highlights the seasonal shifts but also influences the charm and activities that Castlerock has to offer throughout the year.
In January, Castlerock experiences an average wind speed of 7.8 m/s (17 mph), marking the beginning of the year with a brisk breeze. This relatively moderate wind sets the tone for the winter months, charting a course towards February, when gusts pick up significantly to 10.5 m/s (23 mph), peaking within the first quarter of the year. Following this spike, March sees a slight decline to 7.5 m/s (17 mph), hinting at a gradual easing in tension as spring approaches. As the seasons transition, April and May present gentler winds, averaging around 5.9 m/s (13 mph) and 6.2 m/s (14 mph) respectively, ushering in a calmer atmosphere. However, this tranquility wanes as temperatures rise, leading to the summer’s languid conditions in July, with wind dropping to a mere 3.8 m/s (8 mph). The trend continues into August, only slightly recovering in September with 5.5 m/s (12 mph). As autumn takes hold, winds begin to pick up again, peaking in November at 9.3 m/s (21 mph), before settling at 8.3 m/s (19 mph) in December. This pattern illustrates a dynamic cycle, where January's gusts evolve into a series of ebbs and flows, ultimately culminating in a robust windscape as the year draws to a close.
The weather in Castlerock changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of January's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Castlerock and find detailed weather information for every month.
January and February exhibit similar climate patterns, with both months averaging around 7°C (45°F). However, January tends to have slightly higher maximum temperatures, reaching up to 13°C (56°F), compared to February's peak of 12°C (54°F). Precipitation is more prominent in February, with 132 mm (5.2 in) recorded over 18 days, surpassing January's 109 mm (4.3 in) over 17 days. Humidity levels remain relatively consistent, at 87% in January and 86% in February. For more detailed insights on February weather, you can check out Castlerock weather in February.
January and March in Castlerock display similar average temperatures, both hovering around 7°C (45°F), but January tends to be slightly warmer with a maximum of 13°C (56°F) compared to March's maximum of 12°C (54°F). January sees a minimum temperature of 2°C (36°F), whereas March is cooler with a minimum of -1°C (31°F). Precipitation is comparable in both months, with January recording 109 mm (4.3 in) over 17 days, and March experiencing slightly higher precipitation at 112 mm (4.4 in) across 18 days. Humidity levels remain high in both months, but January has a marginally higher average at 87% compared to 86% in March. For more detailed insights, you can check Castlerock weather in March.
In comparing the weather of January and April, we can observe some notable differences. January sees a colder average temperature, with a minimum of 2°C (36°F) and an average of 7°C (45°F), while April, despite starting with the same minimum temperature, has a slightly higher average of 8°C (47°F). Both months share a maximum temperature of 13°C (56°F). However, January experiences significantly more precipitation, totaling 109 mm (4.3 in) over 17 days, compared to April's 55 mm (2.2 in) over just 12 days. Additionally, humidity remains relatively high in both months, though it's slightly lower in April at 85% compared to January's 87%. For more details on the weather in April, you can check out Castlerock weather in April.
In January, the weather is typically colder, with average temperatures ranging from a chilly 2°C (36°F) at night to a mild 13°C (56°F) during the day. This month also sees higher precipitation, averaging 109 mm (4.3 in) over 17 days, contributing to a relatively humid atmosphere at 87%. In contrast, May brings a noticeable warming trend, with temperatures ranging from a minimum of 5°C (41°F) to a maximum of 16°C (61°F). Precipitation decreases to 72 mm (2.9 in) over 13 days, and humidity also drops slightly to 82%. For a more detailed look at May weather, you can visit Castlerock weather in May.
January and June present contrasting weather patterns. In January, temperatures typically range from a chilly 2°C (36°F) at night to a moderate 13°C (56°F) during the day, with an average of about 7°C (45°F). The month sees considerable precipitation, totaling 109 mm (4.3 in) over 17 days, and high humidity levels at 87%. In stark contrast, June offers a milder climate with temperatures starting at a minimum of 8°C (47°F) and peaking at 17°C (62°F), averaging around 12°C (54°F). Although precipitation is slightly lower at 105 mm (4.1 in) also over 17 days, humidity remains comfortable at 84%. For more details about June weather, you can visit Castlerock weather in June.
In comparison to January, July showcases a significant rise in temperatures, with average daily temperatures ranging from a minimum of 11°C (52°F) to a maximum of 19°C (67°F) versus January's 2°C (36°F) to 13°C (56°F). Both months experience similar precipitation levels, with January receiving 109 mm (4.3 in) over 17 days and July slightly higher at 110 mm (4.3 in) across the same number of days. Interestingly, humidity levels remain consistent, hovering around 87% in January and dropping slightly to 86% in July. For a more detailed view of July's weather, visit Castlerock weather in July.
The weather in January is significantly cooler than in August, with average temperatures ranging from a chilly 2°C (36°F) to a maximum of 13°C (56°F). This month often sees substantial precipitation, accumulating 109 mm (4.3 in) over approximately 17 wet days, resulting in high humidity levels of 87%. In contrast, August offers milder temperatures, with lows of 11°C (52°F) and highs peaking at 18°C (66°F). Despite being a summer month, it sees slightly more rainfall, totaling 146 mm (5.7 in) over 20 days, while humidity remains fairly constant at 86%. For more details about the weather specifics during this summer month, visit Castlerock weather in August.
In January, temperatures in Castlerock range from a chilly minimum of 2°C (36°F) to a maximum of 13°C (56°F), with an average of 7°C (45°F). The month is notably wet, receiving 109 mm (4.3 in) of precipitation over 17 days and maintaining a high humidity level of 87%. In contrast, September brings milder weather, with temperatures starting at a minimum of 9°C (49°F) and reaching up to 17°C (64°F), averaging around 14°C (57°F). Though September sees slightly higher precipitation of 117 mm (4.6 in) over 20 days, humidity remains comparable at 88%. For further details, check out Castlerock weather in September.
January and October exhibit notable differences in weather patterns. In January, temperatures typically range from a minimum of 2°C (36°F) to a maximum of 13°C (56°F), with an average of around 7°C (45°F). This month experiences 109 mm (4.3 in) of precipitation over 17 days, coupled with a humidity level of 87%. In contrast, October sees slightly milder temperatures, with a minimum of 5°C (42°F) and a maximum of 16°C (62°F), averaging at 12°C (53°F). The month is wetter, with 161 mm (6.3 in) of precipitation spread across 24 days and a slight increase in humidity to 89%. For a deeper look at October's climate specifics, you can check Castlerock weather in October.
January and November exhibit mild winter weather, but November tends to be slightly warmer and wetter. In January, temperatures range from a minimum of 2°C (36°F) to a maximum of 13°C (56°F), with an average of 7°C (45°F) and about 109 mm (4.3 in) of precipitation over 17 days. In contrast, November's temperatures fluctuate between 4°C (40°F) and 14°C (58°F), averaging around 9°C (49°F), while experiencing greater rainfall at 156 mm (6.2 in) over 23 days. Both months feature high humidity levels, with January at 87% and November slightly higher at 90%. For a detailed overview of November weather, you can check Castlerock weather in November.
In comparing the weather between January and December, both months start with a similar minimum temperature of around 2°C (36°F), but January's average temperature dips slightly to 7°C (45°F), while December averages at 8°C (46°F). December also tends to be wetter, accumulating 166 mm (6.5 in) of precipitation over 23 days, compared to January's 109 mm (4.3 in) spread across 17 days. The humidity remains fairly constant, with December at 86% and January slightly higher at 87%. For a more detailed look at December's weather patterns, you can visit Castlerock weather in December.
As January unfolds in Castlerock, it presents a distinct shift from the milder months, marked by cooler temperatures that average around 7°C (45°F) and a notable increase in precipitation, with rain falling on 17 days throughout the month. This period is characterized by a refreshing humidity level of 87%, creating a brisk atmosphere that contrasts sharply with the warmer, drier days of late spring and summer. Residents and visitors alike can expect a blend of mild chill and frequent showers, making it an ideal time for cozy indoor activities and stunning coastal views. For a deeper dive into what to expect year-round, explore the Castlerock Climate.