The 24-year-old scored seven goals last month, including a hat-trick against Elgin City, to help keep James McDonaugh's men at the top of the table.
Henderson is joint-top SPFL scorer this season with 18 league goals - the same number as Lawrence Shankland (Ayr United) and Kevin Nisbet (Raith Rovers).
He has netted 26 goals in 30 appearances in all competitions for City, having moved from Annan Athletic in the summer, and was also voted League 2 Player of the Month in October.
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