freezedates: Freeze Date Calculator

In springpheno: Spring Phenological Indices

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)

springpheno documentation built on Nov. 11, 2021, 9:06 a.m.