Since 2001, there has been a period with a positive anomaly; this is a consequence of an increase in both maximum and minimum daily temperatures, especially in summer time. Several summers after 1990 are characterized by an increasing rate of minimum temperature higher than that of maximum temperature. The northern part of the coastal zone does have lower temperatures in the winter season compared with the middle and southern zones, but summer temperatures are similar across all coastal regions. There were two cases of "heat-wave days" (when, over six consecutive days, the air temperature is at least 5°C more than the long-term average temperature for the corresponding days) recorded prior to 2001.