Iceland's weather is cool, and the Icelandic climate is temperate. The warm North Atlantic Current ensures generally higher temperatures than in most places of similar latitude in the world. Iceland's winters are mild and windy while the summers are cool which is typical for Scandinavia. With Iceland's unique geological position.
There are some variations in the climate between different parts of the island. Oftentimes, the south coast is warmer, wetter and windier than the north. Snowfall in winters is more common in the north of Iceland.
Considering the northerly location of Iceland, its climate is much milder than might be expected, especially in the southern coastal areas, that are strongly influenced by the warm waters of the atlantic Gulf stream. The mean annual temperature for Reykjavík is 5°C, the average January temperature being -0.4°C and July 11.2°C. The annual rainfall on the south coast is quite high, about 3000 mm, whereas in the highlands north of Vatnajökull have only 400 mm or less.
Icelandic Met Office: en.vedur.is
Institute for Meteorological Research: www.belgingur.is/locales/en