Our Sea King limits (we have a particle separator) depend on OAT and visibility; if the vis is above 2000m or the OAT below minus 6 degC then there is no limit.
The most restrictive limit is with vis less than 500m and the OAT above minus 6 degC when we have a 10 minute limit. This follows the idea that warm wet snow is the most hazardous due to accretion/blocking intakes etc.