Answer: Clematis generally take several years to settle in and hit their full stride, so if these are newly planted patience is probably in order. If your clematis are of different varieties, you may find that pruning practices make a difference in blooming performance since some bloom on old wood, some on new wood of the season, and some will bloom on both. If they are established plants I would suspect that the very dry year we have experienced is taking its toll on these plants. Clematis need an evenly moist soil and appreciate a cool root run. Be sure to keep them watered as needed and apply several inches of organic mulch over the root zone if you haven't already.
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