Summer in April - a very unlikely event?

In Holland, April 2007 will break a series of records: the hottest, driest, en sunniest April ever. With respect to heat and drought this month does not fit into the bandwidth of previous April months, in spite of its capricious nature. Global warming has made the high temperatures less unlikely, but the main cause is an extraordinarily persistent high pressure system that brought dry, sunny and warm weather to a large part of Europe. This pattern is not predicted to occur more frequently by the current climate models, so as far as we know now it must be ascribed to a chance fluctuation in the weather.