Vatnajökull National Park
Temperatures on the southern part of the ice cap are almost always below zero and can drop to −20 °C in winter or −30 °C fall. Since strong winds and storms are normal, the wind factor must be taken into account. Wind can have an essential effect on outdoor activities, even if the prevailing air temperature is otherwise relatively high. The further north you get behind the ice cap, the lower the annual rainfall. To the northeast of the ice cap, it falls to between 350 and 450 mm per year, which is the lowest rainfall in Iceland. The precipitation rises again closer to the north coast and in parts of the highlands around Askja. The temperature can drop relatively sharply on clear and windless days in winter.