I would think that the temperature difference would not make that much of a difference in the movement of the fish. Up here in the north we have temperature extremes where it will change 20 degrees every couple of days, either up or down. The fish will be in the same place just their feeding habits will change from extremely aggressive to very placid. During a real major cold front I drop down in line size from 4# to 2# and drop down accordingly in lure size also. Unless the water you fish is so small that a temperature change will effect the water temperature I wouldn't worry about it.