Hi George, First a general suggestion as you are new to this list. When you ask questions on the Ferret list, please use a subject line that describes the question. It sounds like you have a solution for seasonal data, but here's a Ferret answer. You can define any time axis you want, and regrid to that new time axis. A regularly-spaced seasonal axis might go like this, using time steps of a quarter of a year, listing the end points, and using the /EDGES qualifier to indicate that the dates in the time range are the edges of the grid cells, rather than the coordinate locations. yes? define axis/t=1-jan-1980:31-dec-2009:0.25/edges/units=year season_axis yes? let season_wind = uwind[gt=season_axis] yes? list/x=300/y=30 season_wind The grid points for the axis I defined will be in February, May, August,November for seasons that are 3-months long starting with Jan-Feb-March. You could make other definitions by changing the time axis definition. Ansley On 9/9/2015 8:04 PM, George Otieno
wrote:
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