Count the number of days where maximum temperature is below 0 degrees C.
Usage
ck_ice_days(tmax, dates, period = "annual")
Arguments
- tmax
Numeric vector of daily maximum temperatures (degrees C).
- dates
Date vector of the same length as tmax.
- 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
tmax <- c(-2, 3, -1, 5, -3, 0, 2, -4, 1, -1)
ck_ice_days(tmax, dates)
#> period value index unit
#> 1 2024-01-01 5 ice_days days