Lake Superior Air Temperature dataset

The data file contains hourly air temperature measurements at four locations on or near Lake Superior.  This record starts at 1 January 2000 (at 00:00), and continues up until the Fall of 2006. There are four columns of space-delimited temperature data, in Celsius, each from a different location:

        Column 1 Lat 47.08 Lon -90.73
        Column 2 Lat 47.87 Lon -89.31
        Column 3 Lat 48.22 Lon -88.37
        Column 4 Lat 47.18 Lon -87.22

In these data, we expect to find a lot of patterns and cycles, with an individual location's record, as well as correlations between locations.  Because of your familiarity with the weather, and after looking at the locations on a map (Google Maps accepts comma separated Lat, Lon), you should quickly make a list of what you expect.

Note:  these records have gaps, indicated as the ever-pleasant NaN. Just what you'd expect from the messy world.

Credit: these data were provided for you by Dr. Jay Austin.