Atlas: Select a season (monthly data)
The season is defined by a starting month and the duration of the season. This implies that for instance the boreal winter season December-February is selected by setting the starting month to "Dec" and the length of te season to "3". This season is counted towards the second year of the interval, so a 1986-2005 average would include the winter months from December 1985 up to February 2005.