As a long-time resident of the metro area, I can attest it is more like every 8-10 years. But your rhetorical question still holds.
I predict that within 4 years we will have a(n incorrect) weather forecast that causes the city to shut down for a non-event. And so it goes . . .
The rhetorical question doesn't hold. See the Link and do the math.
(excerpt)
In Atlanta, snowfalls of greater than 2.6 inches happen every 4.25 years and snowfalls of greater than 1 inch happen every 1.5 years. And that doesn't include freezing rain storms and flash freezes.