ck_warm_spell: Warm Spell Days (Series-Quantile Approximation)

In climatekit: Unified Climate Indices for Temperature, Precipitation, and Drought

Warm Spell Days (Series-Quantile Approximation)

Description

Count the number of days in warm spells, where a warm spell is defined as at least six consecutive days with Tmax above the threshold quantile of the full input series. This is a quick approximation driven by a single series-wide quantile, and does not require a reference period.

Usage

ck_warm_spell(tmax, dates, threshold = 0.9, period = "annual")

Arguments

tmax	Numeric vector of daily maximum temperatures (degrees C).
dates	Date vector of the same length as tmax.
threshold	Numeric. Quantile threshold (default 0.9, i.e. 90th percentile).
period	Character. Aggregation period: "annual" (default) or "monthly".

Details

For the canonical ETCCDI WSDI definition (1961-1990 calendar-day base, six-day spell rule), use ck_wsdi().

Value

A data frame with columns period, value, index, and unit.

Examples

dates <- as.Date("2024-01-01") + 0:364
set.seed(42)
tmax <- rnorm(365, mean = 20, sd = 5)
ck_warm_spell(tmax, dates)

climatekit documentation built on May 9, 2026, 5:08 p.m.