Yes, that doesnt make any sence, except somedy or a group of miners turned their asics off in agreemnt to ccol the hasrate down. Or maybe some big asic miners have issues with the sunny weather (acually about 35 C) in germany right now :-)

Do you have any ideas whats going on?

Here s another grapg from blockchaininfo:
https://blockchain.info/charts/hash-rate?showDataPoints=true×pan=30days&daysAverageString=1&scale=0&address=

http://s22.postimg.org/6tumrr8sx/blockchaininfo_hashrate_drop_2013_06_19.jpg

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Asics turned on again. Everything back to normal :-)

http://blockchain.info/de/charts/hash-rate?timespan=30days&showDataPoints=true&daysAverageString=1&show_header=true&scale=0&address=

http://postimg.org/image/vwn9tsi1p/