As jurop88 sugested, try to run weather.sh via terminal, BUT before every run you have to open /home/user/imagemagick/check.txt and erase everything in it. (that would mean that weather has changed and script will do its job)
/home/user/imagemagick$ ./weather.sh sh: gs: not found sh: gs: not found convert: unable to read font `fonts/tahoma.ttf' @ warning/annotate.c/RenderType/807. convert: unable to read font `/usr/lib/ImageMagick-6.6.0/config//usr/share/fonts/type1/gsfonts/n019003l.pfb' @ error/annotate.c/RenderFreetype/1044. convert: Postscript delegate failed `/var/tmp/magick-XXu98UMH': /magick-XXicJPvJ.cache @ error/ps.c/ReadPSImage/766. sh: gs: not found sh: gs: not found convert: unable to read font `fonts/tahoma.ttf' @ warning/annotate.c/RenderType/807. convert: unable to read font `/usr/lib/ImageMagick-6.6.0/config//usr/share/fonts/type1/gsfonts/n019003l.pfb' @ error/annotate.c/RenderFreetype/1044. convert: Postscript delegate failed `/var/tmp/magick-XXAushhR': /magick-XXmkkMAV.cache @ error/ps.c/ReadPSImage/766. sh: gs: not found sh: gs: not found convert: unable to read font `fonts/tahoma.ttf' @ warning/annotate.c/RenderType/807. convert: unable to read font `/usr/lib/ImageMagick-6.6.0/config//usr/share/fonts/type1/gsfonts/n019003l.pfb' @ error/annotate.c/RenderFreetype/1044. convert: Postscript delegate failed `/var/tmp/magick-XXSddJxa': /magick-XXA3ZwCh.cache @ error/ps.c/ReadPSImage/766. sh: gs: not found sh: gs: not found convert: unable to read font `fonts/tahoma.ttf' @ warning/annotate.c/RenderType/807. convert: unable to read font `/usr/lib/ImageMagick-6.6.0/config//usr/share/fonts/type1/gsfonts/n019003l.pfb' @ error/annotate.c/RenderFreetype/1044. convert: Postscript delegate failed `/var/tmp/magick-XXF4pF7v': /magick-XXuzcdfy.cache @ error/ps.c/ReadPSImage/766. sh: gs: not found sh: gs: not found convert: unable to read font `fonts/tahoma.ttf' @ warning/annotate.c/RenderType/807. convert: unable to read font `/usr/lib/ImageMagick-6.6.0/config//usr/share/fonts/type1/gsfonts/n019003l.pfb' @ error/annotate.c/RenderFreetype/1044. convert: Postscript delegate failed `/var/tmp/magick-XXzh3hpF': /magick-XXkkQWiI.cache @ error/ps.c/ReadPSImage/766. sh: gs: not found sh: gs: not found convert: unable to read font `fonts/tahoma.ttf' @ warning/annotate.c/RenderType/807. convert: unable to read font `/usr/lib/ImageMagick-6.6.0/config//usr/share/fonts/type1/gsfonts/n019003l.pfb' @ error/annotate.c/RenderFreetype/1044. convert: Postscript delegate failed `/var/tmp/magick-XXhe5pXS': /magick-XXCt9UMY.cache @ error/ps.c/ReadPSImage/766.