What variant phrases of 五里不同天 exist? 五里不同天 is defined in《广安方言与民俗词典》as:


  比喻地区不同，事物就有差异。


I remember long ago hearing that in 福建 they say that the culture changes every nine li, but I never learned the actual phrase.

What similar phrases exist? I'm afraid that 广安方言 might not be all that universal.
"十里不同音，百里不同俗"


Means different dialect every ten li / culture every hundred li  

Basically the same methodology to describe how things are varies in such small geologic differences.  Also I believe "天" in "五里不同天" refers to the weather / climate (weather and climate are 2 different thing but I can't tell which one fits better here)