-- we used to see graupel several times a year at our house in Colorado. Neat stuff! And fairly common at that high altitude with very dry air.
If it's very uncommon in your area, I'm wondering if it could possibly be due to geoengineered ice nucleation. :P
https://geoengineeringwatch.org/geoengineered-winter-weather-the-chemical-ice-nucleation-factor/