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Danger levels frost

Ground frost occurs when the temperature close to the ground (measured 5 cm above the natural ground level) falls to the freezing point or below. This can have certain damaging effects on agriculture and forestry.

Ground frost warnings are only issued during certain times of the year from 15 March to 31. October and for low-lying areas (below 600 m):

Ground frost also occurs in the winter, but since this is not unusual for the season, no warnings are issued during the winter period.

Danger level 2 (moderate danger)

Effects

Frost hazard due to temperatures that cause damage to plants and crops.

Behaviour

Take specific protective measures (e.g. covering crops; placing particularly susceptible potted plants against a house wall).
Description of measurement and prognostic values
  • Light to moderate ground frost at temperatures between 0° and -4° (at a height of 5 cm above ground level).*
  • Heavy ground frost at temperatures below -4° at a height of 5 cm above ground level.*
Danger level 1 (minimal or no danger)
Effects

No hazard posed for plants or crops.

Behaviour

-
Description of measurement and prognostic values

Generally no frost, or light localised ground frost.

Notes:

*A distinction is made between ‘light to moderate’ and ‘heavy’. Only hazard level 2 exists.

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