Hey Bart,
Fijne aanvulling van je. Denk dat ik met mijn 25% wellicht nog aan de hoge kant zat.
http://www.knmi.nl/kenniscentrum/zomer_in_april/index_en.html
Conclusions
Global warming has increased the probability of an extremely warm April as the one we observed in 2007. However, on top of this it still was a highly unlikely event, with an estimated return time of more than 200 years. The record warm, dry and sunny weather was caused by a persistent high pressure system over our part of Europe.
april 2007
http://www.knmi.nl/klimatologie/maand_en_seizoensoverzichten/maand/apr07.html
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