Hi WWW,
You're right in your assumption. The 7th and 8th digits in the runway state group refer to braking action or friction co-efficients. The numbers 91 to 95 would be used to represent braking action from poor to good, with 99 being used to indicate that there is no reliable figure. Other numbers used in the report (such as you have seen) would be to give the actual friction co-efficient; i.e, 59 = friction co-efficient 0.59.
If you want a reference source to look it all up, according to the guff I still have in my ATPL met notes it is in the UK AIP GEN 3-5-10 Meteorological Codes. That was Dec 99, so might be a little out of date now.
Interesting difference in the snow coverage between 04L and R and rwy 12. Had 12 been partially cleared or something?
