Last updated: January 18, 2025
The climate of Castel, Guernsey is classified as Cfb according to the Köppen-Geiger system, indicative of a temperate maritime climate. This region experiences a minimum temperature of 0°C (32°F) in March, while the average temperature hovers around 13°C (55°F) throughout the year. Peak warmth is observed in August, where temperatures can reach a maximum of 22°C (72°F). With mild temperature fluctuations and a generally temperate environment, Castel offers a unique climate ideal for diverse flora and a range of outdoor activities.
Temperature patterns in Castel, Guernsey illustrate a mild and gradual progression through the seasons, characterized by cooler winters and warmer summers. January and February experience the lowest temperatures, with January averaging 9°C (49°F) and February dipping to a minimum of 0°C (33°F). As spring approaches in March and April, warmth begins to emerge, bringing average temperatures up to 10°C (50°F) by April, while May ushers in a pleasant increase, peaking at 12°C (54°F). Summer reaches its zenith in July and August, with maximum temperatures soaring to 21°C (70°F) and 22°C (72°F) respectively, accompanied by a comfortable average of around 17°C (63°F). As autumn sets in, temperatures begin to decline, with October averaging 15°C (59°F) before settling into lower ranges of 9°C (48°F) and 6°C (43°F) in November. This seasonal variation showcases Castel's temperate maritime climate, making it an inviting locale year-round.
In Castel, temperatures range from a minimum of 0°C (32°F) in March to a maximum of 22°C (72°F) in August, showcasing a significant variation across the months. For more detailed information on the monthly temperatures in Castel, you can visit monthly temperatures in Castel.
Precipitation patterns in Castel, Guernsey reveal a notable seasonal variability, with the heaviest rainfall typically occurring in the winter months. January sees an average of 94 mm (3.7 in) over approximately 14 days, while February follows closely with 86 mm (3.4 in) across 16 days. In stark contrast, April experiences a significant drop to just 34 mm (1.3 in), marking the driest month. The transition into spring and summer remains relatively mild, with May and June recording 55 mm (2.2 in) and 59 mm (2.3 in) respectively, before July sees a decline to 37 mm (1.5 in).
As autumn approaches, Castell experiences a resurgence in rainfall, particularly in October, which averages a substantial 144 mm (5.7 in) over 17 days. November also remains wet, with 126 mm (5.0 in) spread across 18 days, while December typically concludes the year with the highest precipitation at 163 mm (6.4 in) over 21 days. This distribution indicates that while summer months are generally more arid, the late fall and winter periods are punctuated by increased moisture, vital for maintaining the lush landscapes characteristic of this coastal region.
Sunshine duration in Castel, Guernsey exhibits clear seasonal trends, with a notable increase in hours as the year progresses from winter to summer. January starts with relatively low sunshine at 107 hours, gradually improving through February, which sees an increase to 163 hours. March marks a significant leap, accumulating 238 hours of sunlight, while April sees an even more substantial rise to 359 hours. This upward trajectory continues as spring transitions into summer, culminating in the peak sunshine month of July, where residents can bask in 436 hours of glorious sunlight.
As the calendar advances into late summer and autumn, sunshine hours begin to wane, albeit at a much slower rate than the initial rise. August still provides a generous 396 hours, followed by September's 338 hours. The decline becomes more pronounced in October, dropping to 270 hours, and further decreases through November (181 hours) and December (130 hours). This seasonal pattern underscores how Castel enjoys its brightest and sunniest periods during the summer months, while winter brings shorter days and less sunlight, creating a rhythmic cycle that shapes the local climate and lifestyle.
The UV Index in Castel, Guernsey shows a clear variation throughout the year, indicating significant changes in sun exposure and potential skin damage risk. During the winter months, January starts with a low UV Index of 2, which maintains a safe exposure category, allowing for longer burn times of 45 minutes. As February progresses, the UV Index rises to 3, categorized as moderate, where the burn time decreases to 30 minutes. This upward trend continues into March with a UV Index of 4, indicating a slight increase in risk while still allowing for a reasonably safe exposure time.
The onset of spring and summer sees a marked increase in UV exposure, reaching its peak in June with a UV Index of 9, categorized as very high, requiring caution with a burn time of just 15 minutes. This intensity slightly lessens in July, where the UV Index records 8, before tapering to 7 in August. As autumn approaches, the UV Index begins to decline, hitting 4 in October and reverting to 2 and 1 in November and December, respectively, representing a return to low exposure levels. These seasonal variations highlight the importance of sun protection measures, especially during the spring and summer months when UV radiation poses a greater risk.
UV Risk Categories
Daylight duration in Castel, Guernsey exhibits a distinctive seasonal pattern, reflecting the annual progression of the sun. In January, residents experience only 8 hours of daylight, a stark contrast to February, which brings a modest increase to 10 hours. As spring approaches, March sees daylight extend to 11 hours, and this trend accelerates with the arrival of April, providing 13 hours. May and June represent the peak of daylight hours, boasting 15 and 16 hours respectively, allowing ample time for outdoor activities and exploration during the longer days of summer.
Following the height of summer, daylight hours gradually begin to decrease, with July offering 15 hours before slipping to 14 hours in August. As autumn sets in, September retains 12 hours but further declines to 10 hours in October. November brings daylight down to 9 hours, and the cycle completes with December returning to 8 hours once again. This rhythmic change in daylight duration significantly influences the lifestyle and activities of Castel's residents, dictating everything from agricultural practices to leisure and social events throughout the year.
The climate in Castel, Guernsey, features mild temperatures throughout the year, with January averages around 9°C (49°F) and July peaks at 16°C (62°F). Rainfall varies significantly, with October experiencing the highest precipitation at 144 mm (5.7 in) and April being the driest month at just 34 mm (1.3 in). Sunshine hours are notable, particularly in the summer months, with July enjoying an average of 436 hours of sunshine. For more details, visit Castel climate.
In conclusion, Castel, Guernsey presents a diverse and dynamic climate characterized by its temperate maritime conditions, distinct seasonal variations in temperature, precipitation, sunshine duration, UV index, and daylight hours. From the mild winters to the warm summers, residents enjoy a unique interplay of environmental factors that shape their daily lives and recreational opportunities. The data emphasizes the importance of adapting to seasonal changes, particularly in terms of sun protection during higher UV index periods and maximizing outdoor activities during the extended daylight of summer. Overall, Castel offers a captivating climate that supports a vibrant community, rich landscapes, and an abundance of natural beauty across the changing seasons.