No friction cart is capable of producing coefficient of friction readings for anything more than 3mm of wet water. ie not slush.
Compact snow and ice can be measured and tables are available.
If the runway under normal dry conditions meets or exceeds the minimum friction value ( and therefore is not NOTAM'd likely to be slippery when wet)
then so long as there is blacktop and 3mm of wet water or less than braking action is "good"
If there is slush, wet snow, or more than 3mm of water then then braking action will not be good. The best you should hope for is an estimate from the preceeding a/c and hope it wasn't a Piper Cub or get the Ops guy out of his cosy warm office for a braking test in his 4 x 4. Again only an estimate,
Or, here's a radical notion - divert?
Sir George Cayley