Multiple choice general knowledge science & technology The heaviest recorded hailstones weighed (approximately) 1kg 500gms 250gms 100gms Reveal answer Fill a bubble to check yourself A Correct answer Explanation The heaviest hailstones on record have weighed approximately 1kg. This was documented from the 1986 Bangladesh hailstorm where hailstones of this extreme weight were recorded. Hailstones can grow very large in strong updrafts within thunderstorms.