Snowfall Accumulation Calculator
Estimate snowfall accumulation from precipitation and temperature.
Convert snow depth to water equivalent and vice versa.
Snow Accumulation Estimate
Snowfall accumulation depends on temperature and precipitation amount.
Snow-to-liquid ratio varies with temperature:
| Temperature | Ratio | Snow Type |
|---|---|---|
| 28-32°F (−2 to 0°C) | 10:1 | Wet, heavy snow |
| 20-27°F (−7 to −3°C) | 15:1 | Average snow |
| 10-19°F (−12 to −8°C) | 20:1 | Dry, fluffy snow |
| Below 10°F (below −12°C) | 30:1 | Very dry, powdery |
Formula:
Snow Depth = Liquid Precipitation × Snow Ratio
Example (imperial): 0.5 inches of rain at 25°F → 0.5 × 15 = 7.5 inches of snow
Example (metric): 12 mm of rain at −5°C → 12 × 15 = 180 mm (18 cm) of snow
Water equivalent:
Water Equivalent = Snow Depth ÷ Snow Ratio
This tells you how much water is in a given depth of snow.