I hate that! A lot of TV meteorologists do that as well... de-emphasize the use of "normal" because they say it incorrectly implies other values are abnormal and instead use "average" or "mean." In fact, the NWS normals are not simple averages or means. In some cases, the two can be quite a bit different. There are adjustments for inhomogeneities [pairwise homogenization] and a lot of statistical work behind the scenes to smooth out the data, for instance. So, while calling them "averages" or "means" might be more intuitive for the casual weather viewer, it's not technically correct in the dictionary definition sense.