Calculate Growing Degree Days (GDD)

A wrapper on gsdd::gdd() to get the Growing Degree Days up to a date for the longest growing season.

Usage

gdd(x, end_date = as.Date("1972-09-30"), min_length = 60, msgs = TRUE)

x: A data frame with two columns date and temperature. date, which must be of class Date provides the dates and temperature which must be a numeric vector provides the mean daily water temperature in degrees centigrade.
end_date: A Date scalar of the last date within each year to consider (the year is ignored).
min_length: A whole number of the minimum length to consider. Must be at least twice the window width but no more than 365. If NULL then set to be the difference between start_date and end_date (ignoring the year).
msgs: A flag specifying whether to provide messages.

gdd(gsdd::temperature_data)
#> # A tibble: 1 × 2
#>    year   gdd
#>   <int> <dbl>
#> 1  2019 3605.