Calculating Average while ignoring zero/null values

Hi,

Thank you for your feedback.

Could you please check the below measure and the attached file, whether it suits your requirement?

Average (February & March) = 
(
    (
        CALCULATE (
            SUM ( [Working Hour] ),
            FILTER ( 'Sample', 'Sample'[Month] = "February" )
        )
    )
        + (
            CALCULATE (
                SUM ( [Working Hour] ),
                FILTER ( 'Sample', 'Sample'[Month] = "March" )
            )
        )
)
    / COUNTROWS (
        FILTER (
            'Sample',
            'Sample'[Month]
                IN { "February", "March" }
                && 'Sample'[Working Hour] <> 0
        )
    )