Evaluation frost-free days and related metrics from daily climate records.

FFD(d, returnDailyPr = TRUE, minDays = 165, ...)
FFDplot(s, sub.title = NULL)

Arguments

d

data.frame with columns 'datetime' 'year', and 'value'; 'value' being daily minimum temperature, see details

returnDailyPr

optionally return list with daily summaries

minDays

min number of days / spring|fall required for a reasonable estimate of FFD

...

further arguments passed to frostFreePeriod

s

object returned by FFD

sub.title

override default subtitle

Details

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.

FFD tutorial

Value

a list with the following elements:

summary

FFD summary statistics as a data.frame

fm

frost matrix

Pr.frost

Pr(frost|day): daily probability of frost

Author

D.E. Beaudette