Following is an extract from ICAO Annex 15 which sets out the coding used in a SNOWTAM in Section F. This describes the type of deposits. Section H describes braking action. If you would like to PM me I will send you a copy of the SNOWTAM format.
(DEPOSITS OVER TOTAL RUNWAY LENGTH (Observed on each third of the runway, starting from threshold having the lower runway designation number)
NIL — CLEAR AND DRY
1 — DAMP
2 — WET
3 — RIME OR FROST COVERED (depth normally less than 1 mm)
4 — DRY SNOW
5 — WET SNOW
6 — SLUSH
7 — ICE
8 — COMPACTED OR ROLLED SNOW
9 — FROZEN RUTS OR RIDGES