Because it is at almost 14,000 feet elevation?! Not sure if they are getting more precipitation than normal? Will have to check.
http://www.ifa.hawaii.edu/info/vis/visiting-mauna-kea/winter-visits.html
http://geology.com/records/highest-mountain-in-the-world.shtml
Eg: "Hawaii Faces Down Nearly Three Feet of Snow" or "Will Hawaii's snow storm ruin my vacation? What travelers need to know" or "Hawaii Gets Pounded with Snow" or "More snow in Hawaii than Cleveland? Yep. It happened this past ..." or "Hawaii's highest peaks get 2 feet of snow and more is on the way" and hundreds more like that.
But if you're right, that this is totally normal, then I'd have to think the unthinkable - that the news pages are hyping a story far beyond its true importance in order to generated more clicks. You truly expect me to believe that? Yeah, right.
:-)