Temperature Disparities in the Manche Department, France
A significant temperature difference was observed on Wednesday, March 18, 2026, within the Manche department of France. While some areas experienced temperatures exceeding 21 degrees Celsius, others struggled to reach 13 degrees Celsius, despite clear skies and a distance of only 60 kilometers between them.
Factors Contributing to the Temperature Variation
The contrasting temperatures are attributed to the influence of an anticyclone positioned over the British Isles, directing an easterly airflow. This continental wind plays a crucial role in regulating temperatures across the region.
The Cooling Effect of the Sea
Air moving over the Bay of Seine is significantly cooled as it passes over the relatively cold water, which was struggling to reach 10 degrees Celsius in mid-March. This effect is particularly pronounced in the Cotentin peninsula.
Warmer Inland Areas
South of a line extending from Saint-Germain-sur-Ay to Carentan, the air is not cooled by any large bodies of water. This results in warmer temperatures, reaching up to 17-18 degrees Celsius in the Granville area.
Wind and Coastal Temperatures
Easterly winds, gusting up to 50 kilometers per hour, prevent the formation of sea breezes along the coast, contributing to lower temperatures in narrow coastal strips.
Regional Temperature Outlook
Good weather is expected to continue into the beginning of the following week, coinciding with high tides (coefficient of 104 on Friday). However, temperature variations between the north and south of the Channel are expected to persist. Temperatures at dawn may approach freezing along the banks of the Vire, while afternoon temperatures will range from 10 degrees Celsius in the Val de Saire to 17-18 degrees Celsius in the Granville region.
UV Radiation Warning
Despite the relatively cool temperatures, the intensity of ultraviolet (UV) radiation remains high due to the clear skies. This poses a risk of skin damage, even in March. It is important to be aware of this risk, as it is often underestimated during periods of cooler weather.
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