| climdex.cfd | R Documentation | 
This function takes a climdexInput object as input and computes the climdex index cfd: the annual (or at different periods) count of consecutive frost days (TN < 0C)
climdex.cfd(ci, freq = c("monthly", "annual", "halfyear", "seasonal"),
  spells.can.span.years = FALSE)
| ci | Object of type climdexInput. Here the daily maximum temperature. | 
| freq | Time frequency to aggregate to. Allowed only monthly, annual, halfyear, seasonal. | 
| spells.can.span.years | Default FALSE | 
A vector containing a timeseries of the number of consecutive summer days in a given period (freq).
Christiana Photiadou (KNMI)
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