Sunshine duration is about 2,500-2,700 hours per year, from 147 – average 4.7 hours of sunshine per day in December to 338 – average 10.9 hours of sunshine per day in July.
Lisbon and
Athens, Rome has the highest
UV index between European capitals (only in the continent) and values close to that of
Chicago at 41.9 °N as
ultraviolet radiation is less interfered with by other geographic variables, but with a moderate annual average with index equal to 5, which allows direct exposure to the sun at some times of the year. Values range from 1 (December) to 9 (July). {{Weather box ==Sea temperature==