Use reported Met vis as a back up.
From transport Canada. This is in reference to Hold Over Times but could be used for determining snowfall intensity for landing.
VISIBILITY IN SNOW vs SNOWFALL INTENSITY CHART
LIGHTING TEMPERATURE RANGE VISIBILITY IN SNOW(metres)
˚C HEAVY MODERATE LIGHT
Darkness -1 and above ≤ 1600 >1600 to 4000 > 4000 to 6400
below -1 ≤ 1200 >1200 to 2400 > 2400 to 4800
Daylight -1 and above ≤ 800 >800 to 2400 > 2400 to 4800
below -1 ≤ 600 >600 to 1400 > 1400 to 3200
CAUTION: No holdover guideline exists for Heavy Snow. Takeoff not permitted in Heavy falls of WET Snow (FOM) NOTE: data based on Reported Visibility, rather than RVR
Example how to use; during Daylight, reported temperature is -2 and reported Visibility is 1300 metres. Using the table above result
in determination of Moderate Snow intensity. Crew would use “Snow” rather than “Light Snow” values on Holdover table