I have been for 5 days in sept 2010 and 5 days in June 2012, both times weather was very dry and very warm with just the odd isolated shower in the evening. Crowds were low both times. Most rides were 20 mins wait max,apart from crush coaster which was around the 50 min mark. I paid around £550 for both holidays which was for 2 adults and 2 children under 7. I found very little difference between the two months, maybe June was a tad hotter. But I would happily go again in these 2 months with no hesitation.