I played around a bit on xmacis, looks like its happened 3 times...
1932
2012
2020
1932 Detroit hit 10"+ on Nov 16 and Chicago was at 0.6". Season finished at 25.9" Detroit, 28.1" Chicago.
2012 Detroit hit 10"+ on Dec 29 and Chicago was at 0.8". Season finished at 47.7" Detroit, 30.1" Chicago.
2020 Detroit hit 10"+ on Dec 25 and Chicago was at 0.9". Season thru Dec 27 is 12.2" at Detroit, 0.9" Chicago.