@jcboy,
In the winter months it's not all that unusual. At the higher elevations -- Mauna Kea, Mauna Loa -- you get snow most years. When I lived in the town of Volcano, we had a wood-burning stove and lit a fire every night. Some mornings in the winter the morning dew was actually a coating of frost. But here onthe seacoast, in Hilo, it may start as a cold morning but warm up to at least the high 70s by noon, usually warmer even in winter.