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Compute Annual Weather Variances
Variance of daily mean temperatures from 1975 to 2000.
In[1]:=

Click for copyable input
ListPlot[Variance /@ 

  Partition[

   WeatherData["KORD", "MeanTemperature", {{1975}, {2000}, "Day"}, 

    "Value"], 365], PlotRange -> All, Joined -> True, Filling -> Axis,

  FillingStyle -> LightYellow]
Out[1]=