The summer is short; July and August are the warmest months. The 24-hr average temperature in July is . This is based on the 1961–1990 base period; recent years have tended to be warmer in this area. There are usually two to three warm periods during the summer, when the average temperature is between at daytime. The warm days may last for 2–14 days, with the temperature peaking at . Occasionally, the temperatures stay over even at night time, a phenomenon called "tropenatt" in Norwegian.