Count the number of days where minimum temperature is below 0 degrees C.
Usage
ck_frost_days(tmin, dates, period = "annual")
Arguments
- tmin
Numeric vector of daily minimum temperatures (degrees C).
- dates
Date vector of the same length as tmin.
- period
Character. Aggregation period: "annual" (default) or
"monthly".
Value
A data frame with columns period, value, index, and unit.
Examples
dates <- as.Date("2024-01-01") + 0:9
tmin <- c(-2, 3, -1, 5, -3, 0, 2, -4, 1, -1)
ck_frost_days(tmin, dates)
#> period value index unit
#> 1 2024-01-01 5 frost_days days