Last updated: January 18, 2025
Basel-City, Switzerland, is characterized by a Köppen-Geiger climate classification of Cfb, indicative of a temperate oceanic climate. The city experiences a significant temperature range throughout the year, with a historical minimum of -14°C (7°F) recorded in February, contrasting sharply with summer highs reaching up to 37°C (98°F) in July. On average, temperatures hover around 11°C (52°F), reflecting a mild yet dynamic climate that offers a unique blend of seasonal variations. This climatic diversity not only influences the local ecosystem but also shapes the lifestyle and activities of Basel's residents throughout the year.
In Basel-City, Switzerland, temperature patterns exhibit distinct seasonal trends that reflect the region's temperate climate. Winter months are marked by low temperatures, with January and February experiencing minimums as cold as -14°C (7°F) and average highs only reaching about 4°C (39°F). As spring arrives in March and April, temperatures rise, showcasing a gradual warming with averages reaching 10°C (50°F) by April, accompanied by occasional peaks above 25°C (77°F). May ushers in more significant warmth, leading into the summer months, where July records maximum temperatures of 37°C (98°F) and average highs of 20°C (69°F). This warmth lingers into August, before a notable drop in temperature signals the arrival of autumn, with September and October showcasing cooler averages of 16°C (60°F) and 11°C (51°F) respectively. The transition into winter begins again with November and December, where temperatures once more decline, framing a dynamic annual cycle that characterizes the region's climate.
The climate in the Basel region varies slightly among Bettingen, Basel, and Riehen. In Bettingen and Riehen, the minimum temperatures drop to -13°C (8°F) in January, while Basel experiences a slightly colder February minimum of -14°C (7°F). Each location can see maximum July temperatures soaring to 36°C (98°F) in Bettingen and Riehen, with Basel reaching up to 37°C (98°F). For detailed monthly temperatures, visit monthly temperatures in Bettingen, monthly temperatures in Basel, and monthly temperatures in Riehen.
Basel-City experiences a varied precipitation profile throughout the year, influenced by seasonal changes. The winter months of January and February witness substantial precipitation, with 91 mm (3.6 in) and 75 mm (3.0 in) respectively, often falling as snow during the colder spells. As the spring approaches, March sees an increase to 88 mm (3.5 in), while April marks a slight decline to 60 mm (2.3 in). The transition into late spring and early summer brings a notable uptick, peaking in May with 128 mm (5.0 in), followed closely by June at 121 mm (4.8 in).
The summer months maintain elevated precipitation levels, particularly in July and August, with 120 mm (4.7 in) and 115 mm (4.5 in) respectively. As autumn sets in, September experiences a decrease to 68 mm (2.7 in), signaling the beginning of drier months. However, October ramps up again with 90 mm (3.6 in), and November brings similar levels at 75 mm (2.9 in). The end of the year concludes with December recording 125 mm (4.9 in), often amidst a mix of rain and snow, showcasing a cyclical pattern of precipitation that defines Basel's climate.
In Basel-City, sunshine duration follows a clear seasonal pattern, characterized by a significant increase from the dark winter months to the sun-drenched days of summer. Starting with a modest 136 hours in January, the amount of sunlight begins to rise as spring approaches, with February enjoying 211 hours and March further enhancing the sun's presence with 283 hours. This upward trend culminates in April and May, which showcase around 353 hours and 361 hours, respectively, as longer days begin to take hold and the landscape flourishes with vitality.
The emergence of summer brings the highest levels of sunshine to Basel, peaking in July with an impressive 413 hours. This sun-kissed month is closely followed by August, still basking in 381 hours of sunshine. As autumn approaches, however, there is a noticeable decline; September holds onto 323 hours, but this dwindles further to 265 hours in October and then drops markedly to 192 hours in November. The year concludes in December with 156 hours of available sunshine, highlighting the stark contrast between the sun-drenched summer and the subdued winter, effectively framing Basel's diverse climatic character through its sunshine duration.
The UV Index in Basel-City, Switzerland, reflects a pronounced seasonal variation that underscores the importance of sun safety throughout the year. During the winter months, UV Index levels are generally low, with January registering a UV Index of 2 and a corresponding burn time of 45 minutes. As the year progresses into February and March, the index climbs to 3 and 5, indicating a moderate risk of harm from unprotected sun exposure, with reduced burn times of 30 minutes in both months. By April, the UV Index escalates to 6, categorized as high, and the burn time shortens to 25 minutes, signaling the need for increased sun protection as spring unfolds.
The summer months in Basel bring the highest UV Index readings, peaking at 9 in June and July, where exposure is classified as very high and burn times tighten to just 15 minutes. August sees a slight dip to 8, but sunlight remains potent. As fall approaches, there is a notable decrease, with September returning to a high level of 6, and further dropping to 4 in October, indicating a moderate risk once again. By November and December, the UV Index falls back to 2 and 1, respectively, marking a return to low exposure levels and longer burn times of 45 minutes, emphasizing the shift towards moderation in sun exposure as winter settles in.
UV Risk Categories
Daylight duration in Basel-City, Switzerland, exhibits a striking seasonal rhythm, reflecting the varying lengths of days throughout the year. Beginning in January with a mere 8 hours of daylight, the city gradually transitions into spring, as February sees an increase to 10 hours and March offers 11 hours. This upward trend continues into April and May, where daylight stretches to 13 hours and 15 hours, respectively, allowing for longer, sunnier days that invigorate the landscape and the local populace.
As summer arrives, June, July, and early August maintain this peak daylight duration of 15 hours, providing ample opportunity for outdoor activities and social gatherings. Following this zenith, daylight hours start to wane, with a gentle decline to 14 hours in August, and further diminishing to 12 hours by September. The transition into autumn and winter brings shorter days once again, with October at 10 hours, dropping to 9 hours in November, and returning to 8 hours by December. This cyclical pattern underscores the impact of seasonal changes on daily life in Basel, affecting everything from recreational pursuits to agricultural practices.
Basel, Switzerland experiences a temperate climate with distinct seasonal variations. Winters are cold, with temperatures ranging from -14°C (7°F) in February to mild averages of around 1°C (35°F), while summers can be quite hot, peaking at 37°C (98°F) in July. Precipitation is abundant, especially in May with 133 mm (5.2 in), and the city enjoys considerable sunshine hours, particularly in July with 413 hours. This favorable mix of climate conditions and seasonal changes makes Basel a vibrant place to experience throughout the year. For more details, visit Basel climate.
Bettingen, Switzerland experiences a varied climate throughout the year, with January temperatures ranging from a chilly -13°C to a mild 17°C, while July can reach up to 36°C. Precipitation is significant, peaking in May (126 mm) and leading to a wetter summer season. The region enjoys ample sunshine, especially in the summer months, where July boasts 413 hours of sun. Winter months are colder and cloudier, with January record low sunshine at only 136 hours. For more details, visit Bettingen climate.
Riehen, Switzerland experiences a diverse climate characterized by cold winters and warm summers. January's temperatures can plunge to -13°C (8°F), while July sees highs reaching up to 36°C (98°F). Precipitation is highest in May and June, averaging around 126 mm (5.0 in), and sunshine peaks in July with 413 hours. The changing temperatures and varied precipitation contribute to a vibrant seasonal landscape. For more detailed information, visit Riehen climate.
In conclusion, Basel-City, Switzerland, showcases a dynamic climate and seasonal patterns that significantly affect its daylight duration, sunshine hours, precipitation, and UV Index throughout the year. From the crisp winter days with limited sunlight and low UV exposure to the vibrant summer months filled with prolonged daylight and heightened sun intensity, the city's climatic diversity offers a rich tapestry of experiences across the seasons. Understanding these patterns is essential for residents and visitors alike, enabling them to plan outdoor activities, take appropriate sun safety measures, and appreciate the natural beauty that each season brings to this charming Swiss city.