Dezelfde grafieken van Maastricht. 
https://www.mscha.org/knmi/summer_graph.cgi?station=380&year=1908&month=10
https://www.mscha.org/knmi/winter_graph.cgi?station=380&year=1909&month=0
https://www.mscha.org/knmi/winter_graph.cgi?station=380&year=1909&month=3