# Exclude April from 3 month moving average

#### jwalkerday

##### New Member
I calculate a three-month moving average in hundreds of sheets using the formula below.

April (4) is always an anomaly so I want to exclude it from any affected averages. For example- for may's average, I want to use May, March and February. I looked at trimmean but I don't think that works in this instance.

Any ideas on how I could do this please?

Book1
ABCDEFGHIJKL
2MOVING AV3
3
4123456789101112
55456006501000625605617629641653665677
6
7545600598.3333750758.3333743.333333615.6667617629641653665
Sheet1
Cell Formulas
RangeFormula
A7:L7A7=IF(COLUMNS(\$A5:A5)<\$B\$2,A5,AVERAGE(OFFSET(A5,0,0,1,-\$B\$2)))

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