When I visited the Lake District in July 2003, it was during a hot spell. A friend and myself decided we were going to tackle Skiddaw - and to be fair, as the temperature at the surface was 26 degrees, we were just wearing tee shirts. At the start of the climb, until about maybe halfway up, it was very hot - in fact it was roasting under the baking Sun. But otherwise absolutely optimum conditions. Not sure if you know Skiddaw, but there is one particular stretch of the pathway we used, which is extremely steep, then not quite so bad. Any rate, from feeling as though we were going to collapse with heatstroke, it suddenly began to feel much cooler as we rounded a bend into a shady bit. At the summit, I would estimate the temperature to have been about 16 degrees only. A good 10 degrees cooler than the surface. The Sun was still just as hot, but as soon as you were in the shade, much much cooler - and that was in the height of Summer.
The mountain sheep are tame and wander up to you, presumably expecting food.