I skied in Summer ski camp in Europe in July of 1985. I skied at Stubai, Austria, Zermatt, Switzerland, Tignes, France and ValSenales, Italy. Currently the only area still offering skiing all Summer is Zermatt. The other areas don't have enough snow cover remaining on their glacier's past August 1st to allow for skiing all Summer.
Global warming might be increasing the precipitation, but Summer snow levels are higher, with rain falling on glacial ice.