An internal function that helps to create the climatologies that are
then output with
clim_calc(data, windowHalfWidth, pctile)
The data given to this function during the calculations
The width of the smoothing window to be applied. This width is doubled and centred around the point that the smoothing occurs. Default = 5, which makes an overall window size of 11.
Threshold percentile (%) for detection of events (MHWs).
The function returns the calculated climatologies.