Snowdepth Compared to "Average"
According to Environment Canada "Trace" amounts aren't actually zero. Based on previous years we might stay here for a few days, and the forecast is sort of calling for snow, so who knows?
Snowdepth on March 21st
Plenty of other years have had trace amounts of snow on March 21st: 1968, 1979, 1986, 1988 (actually 0cm), 1992, 1995, 2001 and 2016.
So it's not rare, but 2016 is the only other time that it's happened recently.
March 21st is just a single point in time though, and in 2015 we'd actually reached trace amounts earlier - from March 15-19 - but then got a bunch of snow on the 20th, and then that all disappeared within a week.
1995-2017
Finally, here's one more comparison of how snow depth fluctuates throughout the winter. Last year we were at "trace" amounts for about a week, before getting a bit more snow, and then finally melting down to zero.
I haven't been out to the airport, but in the city there's still quite a bit of snow hanging around in the golf courses and other areas. So I'll be watching carefully for when we officially hit 0cm.
For a closer look a snowdepth, all of these charts are fully explained in Snowdepth and Snowdepth - Part 2.
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