Ever heard of "June Gloom?" June is usually cloudy and often rainy. This is not the hot, Florida rain, but often a cold rain. We tend to avoid Disneyland in June.
I dissagree with this statement. Having grown up in Cerritos, CA 15 min from Disneyland. "June Gloom" Means cloudy mornings that burn off into hazy sunshine in the afternoon. There is no rain. You can look at the rainfall stats for Anaheim to back that up.