Flowering time : latitudinal relationships?

Does anyone know if any work has been done to establish a relationship
between degrees of latitude and and flowering times?  

I have lots of documented flowering times for the Chicagoland area, but I'd
like to make this extensible to just about anywhere.   For example, 
Champaign-Urbana is about two weeks ahead of Chicago for most everything.
Can I then assume that for each degree of latitude (approx. 69 miles, or
111 km) the flowering time will change by one week?

I'd say the answer is no since solar angles, etc. come into play for
different seasons.  But there's also no doubt in my mind that someone's
already put a lot more thought into this than I have.  :) 

So please, any references or pointers would really be appreciated...

Thanks,

Chris

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