KORD Flight Rules Statistics:

In dark blue % of VFR conditions, in light blue % of MVFR, in red % of IFR and in black % of LIFR.
In the following charts, each bar represents a one hour period (00:00 UTC top - 24:00 UTC bottom)

Overall Statistics:

VFR:	68.7 %
MVFR:	18.9%
IFR:	8.9 %
LIFR:	3.6 %

Based on 34,947 METARS