Blijkt ook uit diverse studies, zoals:
Rasmussen, R.M., Vivekanandan, J., Cole, J. The Estimation of Snowfall Rate Using Visibility. J. of Applied Meteorology 1999, 38 (10), 1542–1563.
"...a moderate snowfall rate (estimated in the current study to be between 1 and 2.5 mm h−1) can occur for visibilities between 0.3 and 2.0 km, while a heavy snowfall rate (>2.5 mm h−1) can occur between visibilities of 0.2 and 0.8 km, for temperatures less than 0°C.
During the night the visibility determined by an observer or ASOS will increase by a factor of 2 over the daytime visibility for the same liquid equivalent snowfall rate, resulting in heavy snowfall intensity being converted to moderate, and moderate snowfall intensity being converted to light."
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