Only three European countries-Estonia, Finland, and Iceland-are farther north in their entirety than Latvia, which has latitude of between 55° and 58° and a longitude of between 20° and 28°. During most of December and January, the sun does not rise until after 9 a.m. and sets as early as 3 p.m. On the other hand, to compensate, the longest day of summer lasts almost 18 hours. In spite of its northern location, daytime winter temperatures average only slightly below freezing because of the Baltic Sea and the Gulf Stream. Daytime summer temperatures average about 70°F. The maritime climate also accounts for the country's frequent cloud cover and considerable precipitation (average per year is about 25 inches).