I have to apologise for the fact that I don't seem to have kept a note of where these numbers came from (I suspect it was probably from some Transport Canada work), but below for each type of runway surface are (a) type of surface, (b) minimum likely value of braking coefficient, (c) maximum likely value of braking coefficient.
Actually this probably isn't what you want, since it doesn't cover gravel, sand, etc. but it might be of some use.
G
Hard dry runway 0.4 0.4
Damp runway (max. 0.25mm / 0.01” water) 0.347 0.374
Very light snow 0.334 0.347
Wet concrete (up to 0.75mm / 0.03” water) 0.294 0.334
Wet tarmac (ashphalt) (up to 0.75mm / 0.03” water) 0.268 0.347
Gritted compacted snow or ice 0.294 0.321
Compacted snow below -15°C (5°) 0.262 0.268
Heavy rain (0.75-2.5mm / 0.03” – 0.1” water) 0.254 0.268
Snow covered compacted snow below -15°C (5°) 0.241 0.254
Cold ice below -10°C 0.215 0.241
Wet ice above 0°C 0.201 0.215
Hydroplaning on standing water above 2.5mm (0.1”) deep 0.201 0.201