Run-time efficiency: Cleaning wave date by removing values above calculated threshold

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I would like to reduce the run-time of the attached code, all the files needed to make the code run are in the zip attached. This code currently takes 7.6 minutes to run.
load('SortedHS2009.mat')
tic
for i = 1:length(IndexOfStationsAraeaW)
stationid=genvarname(num2str(IndexOfStationsAraeaW(i)));
for imonth=1:12 %Jan to Dec
index=find(month(Date.(stationid))==imonth); %Find index for current month
[ToClean]=CleanDataV3(HS.(stationid),index); %Find index of values to set to NaN
HS.(stationid)(ToClean)=NaN; %Set them to NaN
end
end
toc

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