The reason 1970 through 99 are referenced is due to the fact that it's set between two epic snowfall periods of 55 through 69 and 2000 through 2018. Since 2018 we have had 1 above average snowfall winter, excluding this winter, 1 in 6 years. 2 years less than 50% of average. 70 through 99 had 4 (correcting my mistake before of 5) above average snowfall Winters, 11 of which were less than 50% of average (30-year period).
My mistake if I painted a picture of absolutely no snow at all in that 30-year period, I am merely trying to give perspective to posters who have not lived like I did through the '80s and '90s which were a far, far cry from 2000 through 2018. 2000 through 2018, and for that matter 55 through 69, skewed snowfall averages as both periods had multiple KU events and above average snowfall winters in a short period as opposed to 70 through 99 which only had a handful, I believe there were only 6, widespread ku's in that 30-year period.
I do not focus on temperatures at all as long as it's cold enough to snow. That being said I also don't want to paint the '80s as a frigid wasteland as I live through it and I remember multiple days in Winter which were very very warm, and was a time period where attention was pointed to global warming. Yes the early '80s did have some extremely cold periods and one month of December 1989 in an otherwise warm winter. I think we all already know the 90s were very warm.