Here are the translations into English so far (sorry of I missed any):

When I think it is my snow
On my hat,
It seems light.

--Blyth


This snow is mine
thinking that way it seems lighter
on your sedge hat

--Bourdaghs


"It's mine," I think . . .
and the snow seems lighter
on my straw hat.

--Carter


if I think the snow mine
my hat
becomes light

--Haldane


"My snow!"--when I think that,
it weighs almost nothing
on my umbrella-hat!

--Henderson


"It's my snow"
I think
And the weight on my hat lightens

--Kerr


Think it's your snow, and it's light on your hat

--Sato

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So, which one does everyone like best, or think is best?

Larry