tidyweather (version 0.2.0)

last_frost_day: Calculate the last frost day

Description

This function calculates the last frost day from a numeric vector of daily minimum temperatures using tidyverse principles.

Usage

last_frost_day(
  .data,
  threshold = weather_options$get("extreme.frost_threshold"),
  hemisphere = "south",
  require_full_year = weather_options$get("require_full_year")
)

Value

An data.frame or tibble representing the day of year for the last frost, or NA if no frost occurs

Arguments

.data

A data frame or tibble containing daily minimum temperatures in a column named "mint".

threshold

The stress temperature threshold for frost (default: 0)

hemisphere

Hemisphere indicator: "south" or "north" (default: "south"). If latitude information is available in the data, it will be used to determine the hemisphere.

require_full_year

Logical. If TRUE, requires exactly 365 or 366 days (default: TRUE)

Examples

file <- system.file("extdata/ppd_72150.met", package = "tidyweather")
records <- read_weather(file)
records |>
    dplyr::group_by(year) |>
    last_frost_day(require_full_year = FALSE)