freezedates {springpheno}R Documentation

Freeze Date Calculator

Description

This function determines when freezes occur during the year given the daily low temperature data, freeze threshold, and the day of year.

Usage

freezedates(tasmin, frzval, DOY)

Arguments

tasmin

Vector - daily low temperature data (degrees Fahrenheit). The vector should have a length of 366.

frzval

Scalar - freeze threshold (degrees Fahrenheit). Typically this is 28F.

DOY

Vector - day of year (1:366)

Value

The output from this function is a list with the following:

firstfreeze

Scalar - day of year matching the first freeze that occurs in the fall.

lastfreeze

Scalar - day of year matching the last freeze that occurs in the spring.

freezeperiod

Scalar - range of days between the first and last freeze.

freezedata

Data Frame - Table containing the values for low temperature (tasmin), Day of year (DOY), and adjusted Day of Year (DOYadj) for those days of the year where a freeze occurs.

Author(s)

Adrienne M. Wootten (University of Oklahoma)


[Package springpheno version 0.5.0 Index]