However, the jury is still out on many of these issues, as there is a lack of comprehensive studies. According to data collected by NCSL : -Twenty-one states currently have school districts (with public schools) operating on a four-day week.
In the capital Lisbon average temperatures range from 8 degrees Centigrade in January to 29 degrees Centigrade in July. But it is not unusual to get temperatures well over 30 degrees Centigrade in some summers particularly at the holiday resort of Faro in far south of Portugal.
Records indicate hours of sunshine in Lisbon range between 5:07 for each day in December and 12:11 daily in July. The longest day of the year is 14:42 long and the shortest day is 9:17 long. The longest day is 5:25 longer than the shortest day.