One consequence of heat waves in increased mortality. The most affected people are the elderly and people with chronic diseases. Ten heat waves occurred in year 2017. During the heat waves of 2017, the death toll did not increase, it even slightly decreased. The average number of deaths was 48 deaths per day during the period of heat waves and 49 deaths per day during the period of non-heat wave days. The number and length of heat waves will increase in the future.