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Frost days

Figure Created 29 Oct 2021 Published 20 Jan 2022 Last modified 20 Jan 2022

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The frost days index is defined as the number of days in a year with a daily minimum temperature below 0°C. Variations of this index limit the counting of frost occurrences to particular seasons (e.g., the growing season or the spring months). A closely related index is ‘ice days’, which uses daily maximum instead of minimum temperature.