It seems to be the symbol "M" for "missing cloud information". Note that CWIJ has a circle for cloud coverage that is slightly bigger than the standard circle size used for most other airports.
Southeast of CWIJ, there is CWIC which has the symbol M as well, but there the edge of the circle coincides with the lower part of the symbol ...
The RMK section:
AO1 = an observation
taken by equipment without a precipitation type discriminator (rain/snow)
SOG 32 = snow on ground, thickness 32 cm
6023 = beats me, I'll keep looking...
SLP176 = sea level pressure: what the current barometric pressure at measurement location would be at sea level, 176 stands for 1017.6 hPa (10 is omitted as persistent)
The Legal answer is no
(1.1) Except as prescribed, no person shall make use of or divulge a radio-based telephone communication
(a) if the originator of the communication or the person intended by the originator of the communication to receive it was in Canada
when the communication was made; and
(b) unless the originator, or the person intended ...