I have an area against a fence/trellis where I'd like to put a clematis. In the summertime, it gets full sunshine all day starting about halfway up the 5.5' fence, with dappled to full shade towards the bottom of the fence. I thought this would be an ideal spot (to keep the clematis "feet" cool). However, I notice that at this time of year, the top of the fence doesn't get direct sunlight all day. There are a few hours during the afternoon where the sun is behind some neighbour's trees until about 5, due to the sun's lower angle. Will this be ok for a clematis? It is basically the hottest part of these cool days where the sun is behind the trees. Or, alternatively, is there another climbing vine that would do well/better in the Surrey, BC (zone 8a) area for these light conditions? Thanks.