Sorry, I can't resist this one!
A snowfence is a kind of slanted fence with openings between the slats,
which may be horizontal or parallel. They are built in the middle of
nowhere and their function is to keep the snow off the roads, buildings,
feed areas or ponds, or whatever else you dont't want covered by great gusts
of wind and snow. They are not very long but may, with intervals between,
and stretch for miles across the prairie.
That "prairie" comes from my Wyoming childhood. Actually they are built in
the foothills of Idaho to protect the ranches too, and there are miles and
miles of them in Montana.
Of course now I am sitting in a little corner of Utah, called Dixie which
gets little if any snow each year. No snowfences anywhere to be seen, but
50 miles out of town there they are!
I think this was just a little joke between snowmen types and what was meant
was that because the snowfences are there "winter is not going to be called
off this year." Snowment types always hope--
Have a very merry little winter,