2 of my biggest bucks were harvested in a couple historic dry years in Wyo. From what I understand a buck fawn born in a dry year, years when does are stressed from harsh winters or other factors will likely be born with smaller than normal pedacles. The buck will be plagued with small bases the remainder of his life. A buck born in years when does are healthier will have larger pedacles the remainder of his life. I'm pretty sure this has just as much input on overall horn growth for a particular buck than year to year changes in moisture, etc.
This is totally different for antlered game such as deer and elk where mass is a smaller proportion of overall score. Tine length is critical for those species. A general rule is that it also takes antlered game a lot more years to reach B&C proportions.
It generally takes 3+ years to produce a B&C antelope buck. I've been keeping track of drought and tough winter years in Wyo since the super drought years in the vicinity of 2012. The trends I mentioned above tend to be true. There were very few B&C bucks harvested 3+ years after this drought period. Now that Wyo has gotten out of the drought cycle with relatively mild winters B&C bucks tend to be popping back up in Wyo. Unfortunately this winter was somewhat harsh in localized areas so that may be a factor.
I really believe a lot of it comes down to healthy does that produce healthy fawns. Pray for good moisture and mild winters to produce great fawn bucks and horn growth...anyway in Wyo! Obviously healthy habitat leads to healthy does, fawns, and monster bucks!