Compute the growing season length following the ETCCDI definition: the
number of days between the first occurrence of at least 6 consecutive days
with daily mean temperature above 5 degrees C and the first span of 6
consecutive days with Tmean below 5 degrees C after July 1 (Northern
Hemisphere) or January 1 (Southern Hemisphere). Calculated per year.
Usage
ck_growing_season(tavg, dates, lat = 50)
Arguments
- tavg
Numeric vector of daily mean temperatures (degrees C).
- dates
Date vector of the same length as tavg.
- lat
Numeric. Latitude in decimal degrees (used to determine
hemisphere for end-of-season rule). Default 50 (Northern Hemisphere).
Value
A data frame with columns period, value, index, and unit.
Examples
dates <- as.Date("2024-01-01") + 0:364
set.seed(42)
tavg <- sin(seq(0, 2 * pi, length.out = 365)) * 15 + 5
ck_growing_season(tavg, dates)
#> period value index unit
#> 1 2024-01-01 182 growing_season days