Calculate an appropriate upper limit for the solar radiation plot based on the theoretical calculation for that time of year.
Calculate an appropriate upper limit for the solar radiation plot based on the theoretical calculation for that time of year.

git-svn-id: acf0ef94bfce630b1a882387fc03ab8593ec6522@216 150532fb-1d5b-0410-a8ab-efec50f980d4

ShawnMurd/MetPy,jrleeman/MetPy,ahaberlie/MetPy,dopplershift/MetPy,ahill818/MetPy,ahaberlie/MetPy,deeplycloudy/MetPy,Unidata/MetPy,dopplershift/MetPy,Unidata/MetPy,jrleeman/MetPy