You mean, Juneau? Never been to the great State of Alaska, would love to go (in a summer :) )
It's obviously a great concern to the Juneau Water dept. and so they publish some relevant info (along with the contact info, very useful if you are a resident there) on their site:
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There are some tables with ground temperature measurements available here:
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I understand it was supposed to be a weekly published data but they only got around to measure it once ... in December 2002. Hope you can use the data.