Originally Posted by
Kacee
SFO is actually pretty close to ORD statistically due to the twin runway configuration, and there's certainly the possibility of a winter storm resulting in imposition of flow controls in late November. That said, some of the worst UA clusters I've ever experienced have been at ORD, though typically in July/August or January/February.
Very much true.
ORD is most at risk for thunderstorms (Jul/Aug) and periodic snowstorms (Jan/Feb).
I did read with the finalization of the runway configuration (8 parallel?) finishing soon, it will have the most (potential) arrival/departure capacity in the world. Of course, weather dependent.