 The marine airflow from the mild North Atlantic tempers winters in spite of the low sun, whilst Haparanda retains enough continental influence for summers to be relatively warm, especially for a coastal city so far north.This is due to the large landmass surrounding the city in most directions as well as the brief midnight sun that normally lasts around 10 days.During summer, daylight is prevalent enough to allow daytime activities around the clock for a longer period than that.