Rain to Snow Calculator

Your details

The depth of liquid precipitation you want to convert to snowfall.
in
Temperature unit for air temperature input.
Surface air temperature at the time of the snowfall event. Colder temperatures produce lighter, fluffier snow and a higher snow-to-liquid ratio.
°F
Use the NWS temperature table for an automatic ratio, or enter your own measured or forecast value.
Equivalent snowfall depthWet, heavy snow
10in

How much snow would fall from this rainfall at the given temperature

Liquid water equivalent1in
Snow-to-liquid ratio used10:1
Snow typeWet snow (dense, easy to pack)
Temperature (°F)28°F
10 :1
Wet/heavy<8Dense8-12Moderate12-20Dry/light20-30Powder30+

Snow-to-liquid ratio: 10:1 at 28 F.

  • At 28 F, a snow-to-liquid ratio of 10:1 applies, so 1.00 in of rain produces about 10.0 in of snow.
  • This is classified as: Wet snow (dense, easy to pack).
  • Low ratios indicate wet, heavy snow that is harder to shovel and places greater load on roofs and branches.
  • Actual ratios vary by crystal type, humidity, and storm dynamics. The NWS table gives a standard planning estimate.

Next stepFor roof or structural load estimates, multiply the snow depth by the snow density (typically 5-20 lb/ft for wet vs dry snow) to estimate weight per square foot.

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