Weather for the Loire Valley
During the summer months the best description I have heard is "like a perfect English summers day, just more reliable!".
April to May ~ as the days get longer the weather improves, glorious sunny spells mixed with springtime showers.
June to September ~ late spring through to early autumn, the weather becomes dependable long dry sunny spells, with temperatures in the mid to high 20's. Evening temperatures hold in the low 20s with a chance of an occasional shower.
October to November ~ October is very pleasant daytime temperatures start to fall but generally dry, November is less predictable as the days draw in and winter approaches.
December to March ~ If your visiting the area during these months it's not for the weather! If your considering buying a property in the area you really should visit at this time of year.