Frost Riski How Is It Calculated and Why Does It Matter?
Frost is an agricultural and safety hazard that occurs when ground surfaces cool below freezing. Early autumn or late spring freezes can devastate crops, vineyards, and tender garden flora.
This tool assesses frost risk using three key parameters: overnight minimum temperature, relative humidity, and wind speed. Under clear, calm nocturnal conditions, radiational ground frost can form even when thermometer readings are 36–38°F (2–3°C).
A sub-freezing dew point indicates water vapor will sublime directly into hoarfrost crystals. Light winds mix warmer air downward and reduce surface freeze potential, whereas calm air amplifies radiant heat loss.
For farmers, viticulturists, and gardeners, accurate evening frost forecasting enables proactive measures such as crop covers, smudge pots, and irrigation sprinklers.