Location, Location, Location.
I just found this page and it's very interesting
To use it google for latitude and longitude and where you are google hopefully will spit out some numbers.
now go here
and put these figures in. To get the best meterological data your height above sea level is also useful.
http://www.earthtools.org/ can help with that or gps info from a smart phone.
Now just let nasa tell you about where you live. From solar cooking to date of last frost temperatures and other stuff.