Hi
I used the month table you have at the side for the sum and the average per month.
In I4, copied down...
=SUMIFS($C$4:$C$93,$A$4:$A$93,">="&H4,$A$4:$A$93,"<"&H5)
In J4, copied down...
=IFERROR(AVERAGEIFS($C$4:$C$93,$A$4:$A$93,">="&H4,$A$4:$A$93,"<"&H5),"")
Note...make sure all the dates in H begin with the 1st of the month. you have some that start on the 12th etc
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