Evaluation frost-free days and related metrics from daily climate records.
FFD(d, returnDailyPr = TRUE, minDays = 165, ...)
FFDplot(s, sub.title = NULL)data.frame with columns 'datetime' 'year', and 'value'; 'value' being daily minimum temperature, see details
optionally return list with daily summaries
min number of days / spring|fall required for a reasonable estimate of FFD
further arguments passed to frostFreePeriod
object returned by FFD
override default subtitle
a list with the following elements:
FFD summary statistics as a data.frame
frost matrix
Pr(frost|day): daily probability of frost
The default frostTemp=32 argument to frostFreePeriod is suitable for use with minimum daily temperatures in degrees Fahrenheit. Use frostTemp=0 for temperatures in degrees Celsius.