For those who it may concern, I've filched the Murr Scale from the LSE thread:
0- Nothing / Nada / just curtain dust + flies around the outside light
1- Odd pellet here & there- however we can mentally confirm there are 'flakes'
2- visible light snow falling- not visible to the lampost yet ( unless you stand underneath & obscure the light)
3- flurry level- makes light blue on the radar & a few flakes seen across the lampost
4- we can confirm snow falling without staring at the light- Can confirm to friends & loved ones its snowing via text etc
5- Status 2- moderate flurry, its fine snow at the moment still- it looks quite hard in terms of snow falling however its not amounting to anything
6- proper flakes falling- you will see them now- the odd flake mixed in with the moderate fine snow
7- transition to normal flakes all complete- moderate snow outside
8- 20p flakes going at a steady pace now- accumulating around 0.5cm - 1cm per hour
9- heavy 20p Snow - visibly accumulating + 1cm per hour
10- entry level heavy snow arriving- 50p flakes fluttering in the 20p flakes.. awaiting the beast...
11- 50p flakes nearly transitioned over- we can call it heavy settling snow 2cm ++ per hour
12- Very heavy snow inch per hour all 50p flakes
13- Blizzard- combined with +40 MPH wind-
Derby is a 1 on the Murr scale. Nearer the double figures please.