Tuesday, September 22, 2009

Messy in Minnesota



I have been examining some of the temperature records from a different perspective--the periodicities in the temperature differences between two nearby towns. Tonight I think I would like to look at Montevideo, MN and Milan, MN two towns separated by 16 miles of highway. One would think that they would give the same temperature. But something is going on to make the temperature difference vary with the time of year. You can see that from 2000 to 2007 mostly each winter the temperature difference between the two towns was small while in the summers it was greater.

Then in 2006 the period of the discrepancy changed. I don't know why. But Montevideo's station is surrounded by satellite receivers. I have no idea what the effect of that is. You can see this at http://gallery.surfacestations.org/main.php?g2_itemId=14364

Milan can be seen at http://gallery.surfacestations.org/main.php?g2_itemId=14238

Such periodicities make one realize that there is a huge problem with the temperature collection system.

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