Consecutive Frost Days (CFD)
https://w3id.org/hacid/data/cs/Copernicus-CCS/indices/ConsecutiveFrostDays(cfd) <https://w3id.org/hacid/onto/data/Variable>
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Consecutive Frost Days (CFD)
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Let TX_ij be the daily maximum temperature at day i of period j. Then counted is the largest number of consecutive days where daily maximum temperature is less than 0 degrees Celsius (TX_ij < 0).