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I remember reading somewhere that temperature can affect their size.
An interesting side-light to the process is that >when water vapor changes state to liquid, the >water vapor molecules give up the kinetic energy >that they had when they were moving. This warms >the remaining free molecules in the air and tends >to delay further condensation. However, this >process actually enhances condensation >of water vapor in the atmosphere because a warmed >parcel of air rises more rapidly, thus expands >more rapidly, thus cools more rapidly, and thus >condenses more rapidly than if the parcel had >stayed in one place and the temperature were >decreased. The enormous growth of towering >cumulonimbus clouds demonstrates this dramatically.
ABSTRACTMany observations have been made of size distributions of raindrops, aggregated snowflakes, graupel and hailstones under various meteorological conditions. The size distributions have been studied in conjunction with upper air soundings which were used to determine the original shape or snow crystal form of the hydrometeors. It was concluded that the size distribution of raindrops is dependent on that of the precursor snowflakes which is controlled by the shape of the snowflakes and the upper air conditions.