Using the 60ºF for a high it looks like Szeged gets there end of March beginning of April and drops below it the third week in Oct. For 40ºF average low looks about the same.
For Fox Valley it's looks like it is from the end of April, beginning of May to the first week in October or about 6 weeks less.
If you look at the area of the graphs that are warm or hot then Szeged has almost 2/3 greater percentage of the time it is warm or hot.
I believe that those 6 weeks and what amounts to much more time when it's warm or hot make a big difference.
It should be interesting if it works.
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