We stayed a few years ago at 'Le Coin Tranquille' at Les Abrets. This was a very pleasant site, a little away from the crowds around Annecy, but still within easy reach of that area. Pitches were of a good size and flat, the pool etc was well kept, there were flowers and shrubs everywhere and the bar and restaurant were excellent. As for the weather - well, we were there in 2003, the year of 'le canicule', or the big heatwave. It was very hot, even at night, and we several times watched planes scooping up water from one of the lakes to drop on forest areas where there were fires.
The web-site is www.coin-tranquille.com