New dataset - northern hemisphere day length rasters for each day of the year at 5 km resolution

 New day length rasters are available at:

 https://nevada.box.com/s/igy01odvcpa7wkoyd6at11h2s25hqw9l

These canned rasters can be used in place of the Day Length Tools for ArcGIS, which isn't as well suited for latitudes greater than 60 degrees. The new data are derived by extrapolating NOAA spreadsheet calculations - https://gml.noaa.gov/grad/solcalc/calcdetails.html.