The first thing I would do is get all that snow off it!
I'd say you have a choice.
You could glue it with epoxy in place and clamp it and hope for the best. They make syringes for use with epoxy so it could be injected into the small crack. Clamping with a few 'C' clamps or other clamps until the epoxy sets is the key.
You could carefully remove the split piece allowing the crack to move up the grain. If the piece comes off (and it might anyway) you would be able to clean it out and uniformly apply epoxy to both sides and clamp it back in place.
The wood looks like it could use some Teak Oil.
"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
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