It seems to average around 260 --- so I'll take day 260, which is Sept 17.

If I'm right, do I get a cookie?

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My guess is day 251 Sept 8th

In a few decades when summers will be mostly ice free

Ice.

next week

Every year people try to forcast how much the minimum ice will be, but I am curious about on which date it will occur, whats your guess?

heres a guide http://sunshinehours.wordpress.com/2014/08/27/arctic-record-reminder/