The clouds can help out tremendously when fishing for smallmouth bass, especially during the summer and fall when these fish are usually deep.  Cloud cover can help keep some of these fish a little shallower than they would be if it were sunny.  In clear water, smallmouth bass may stay in that 8 to 16 foot range on cloudy days instead of being 16 to 25 deep or even deeper.  In darker water, bass may stay in the 5 to 10 foot range instead of being down in that 12 to 16 foot range or even deeper.  These bass will also usually be more active, which means that you can catch more of them during the middle of the day than you normally would.