What variant phrases of 五里不同天 exist?
"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)