1947, a record shared with Ultuna in Uppland. The coldest temperature ever recorded was in Vuoggatjålme on 2 February 1966. Temperatures expected in Sweden are heavily influenced by the large Fennoscandian landmass, as well as continental Europe and western Russia, which allows hot or cool inland air to be easily transported to Sweden. That, in turn, renders most of Sweden's southern areas having warmer summers than almost everywhere in the nearby British Isles, even matching temperatures found along the continental Atlantic coast as far south as in northern Spain. In winter, however, the same high-pressure systems sometimes put the entire country far below freezing temperatures. There is some maritime moderation from the Atlantic which renders the Swedish continental climate less severe than that of nearby Russia. Even though temperature patterns differ between north and south, the summer climate is surprisingly similar all through the entire country in spite of the large latitudinal differences. This is due to the south's being surrounded by a greater mass of water, with the wider Baltic Sea and the Atlantic air passing over lowland areas from the south-west. Apart from the ice-free Atlantic bringing marine air into Sweden tempering winters, the mildness is further explained by prevailing low-pressure systems postponing winter, with the long nights often staying above freezing in the south of the country due to the abundant cloud cover. By the time winter finally breaks through, daylight hours rise quickly, ensuring that daytime temperatures soar quickly in spring. With the greater number of clear nights, frosts remain commonplace quite far south as late as April. The cold winters occur when low-pressure systems are weaker. An example is that the coldest ever month (January 1987) in Stockholm was also the sunniest January month on record. The relative strength of low and high-pressure systems of marine and continental air also define the highly variable summers. When hot continental air hits the country, the long days and short nights frequently bring temperatures up to or above even in coastal areas. Nights normally remain cool, especially in inland areas. Coastal areas can see so-called tropical nights above occur due to the moderating sea influence during warmer summers. Summers can be cool, especially in the north of the country. Transitional seasons are normally quite extensive and the four-season climate applies to most of Sweden's territory, except in Scania where some years do not record a meteorological winter (see