Did 1231 melee strikes against a blasted lands mob with a 1.96 MH (unarmed) and 1.47 OH (haste include). This gives a total of 703 OH swings. Only my OH weapon was enchanted with deathfrost, and I got 38 procs.
Considered as a flat rate, this is 5.4% with a 1.5 base speed OH
Considered as PPM, this is 2.16 procs per minute.
Had some trys last night on a friend:
550 mele hits
2,8 MH 1,5 OH both enchanted with deathfrost. ( hit & expertise caped )
39 Procs
proced while active ( 3 times in a row )
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Doing the math on this data, There is not enough information to calculate the rate or PPM from it, since MH procs and OH procs are added together. However, assuming 2.16 PPM, and doing the math with that, we would get
550*(1.5)/(2.8+1.5) = 192 MH hits @ 2.8s each = 537s = 8.95 minutes = 19.3 procs on average
550*(2.8)/(2.8+1.5) = 358 OH hits @ 1.5s each = 537s = 8.95 minutes = 19.3 procs on average
19.3 procs + 19.3 procs =
38.6 procs total, and you got
39, so we are in agreement
Conclusion: Deathfrost has a melee proc rate of ~
2.16 PPM.