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climatekit 0.2.0

Bug fixes

• ck_total_precip() now applies the canonical ‘ETCCDI’ ‘PRCPTOT’ wet-day filter (precipitation >= 1 mm) by default. Pass wet_day_threshold = 0 to recover the previous raw-sum behaviour.
• ck_first_frost() and ck_last_frost() gain a lat argument and use hemisphere-appropriate cutoffs. Southern Hemisphere users no longer get silent NA results.
• ck_branas() gains a lat argument; Southern Hemisphere growing season is now October-February of the following year.
• ck_precip_intensity() (SDII) returns NA for periods with no valid observations rather than NaN.

In-base bootstrap (Zhang 2005)

• ck_tx10p(), ck_tn10p(), ck_tx90p(), ck_tn90p() gain a bootstrap = FALSE argument. When TRUE, the leave-one-out resampling of Zhang et al. (2005) is applied to remove self-inclusion bias for analysis years inside the reference period. This is the canonical ‘climdex.pcic’ / ‘climpact’ behaviour and is required for climate-change attribution work spanning the base period.

ET-SCI heatwave family extensions

• ck_hwm(), ck_hwa(), ck_cwm(), ck_cwa() gain a mode = c( "excess", "absolute") argument. "excess" (default) preserves the existing ‘ET-SCI’ / ‘climpact’ convention. "absolute" returns mean / peak raw temperature on event days, matching Perkins-Alexander (2013).
• New function ck_ehf() implements the Excess Heat Factor of Nairn and Fawcett (2013), the Australian Bureau of Meteorology operational heatwave metric. Three annual statistics are exposed via stat = c("max", "n_positive", "sum_positive").

SPI / SPEI distribution choice

• ck_spi() gains distribution = c("gamma", "pearsonIII"). Pearson III is preferred in arid regions where the wet-day distribution is highly skewed (Stagge et al. 2015).
• ck_spei() gains distribution = c("log-logistic", "gev"). GEV is fitted via Hosking (1985) L-moments.

FAO-56 Penman-Monteith reference ET

• New function ck_pet_pm() implements the FAO-56 Penman-Monteith reference evapotranspiration (Allen et al. 1998), the international standard. Optional inputs include relative humidity, wind speed, incoming solar radiation, and elevation; FAO-56 fallbacks are used where these are unavailable. ck_pet() remains as the simpler temperature-only Hargreaves estimator.

ETCCDI canonical 27 coverage

• Added 13 new functions completing the full canonical ‘ETCCDI’ 27 set: ck_txx(), ck_tnx(), ck_txn(), ck_tnn() (extreme values); ck_tx10p(), ck_tn10p(), ck_tx90p(), ck_tn90p(), ck_r95p(), ck_r99p() (calendar-day percentile base, default reference period 1961-1990); ck_wsdi(), ck_csdi() (proper calendar-day spell duration). ck_growing_season() was already ETCCDI-compliant.
• ck_warm_spell() is retained as a quick series-quantile approximation; its documentation now points to ck_wsdi() for the canonical ETCCDI definition.

ET-SCI heatwave and cold-wave families

• Added 10 new functions implementing the ‘ET-SCI’ heatwave and cold-wave families on a calendar-day percentile base. Heatwave family: ck_hwn(), ck_hwf(), ck_hwd(), ck_hwm(), ck_hwa() (number, frequency, duration, magnitude, amplitude). Cold-wave duals: ck_cwn(), ck_cwf(), ck_cwd(), ck_cwm(), ck_cwa().
• The ‘CWD’ acronym is used by both ‘ETCCDI’ (Consecutive Wet Days) and ‘ET-SCI’ (Cold Wave Duration). ck_cwd() here is the ET-SCI cold-wave version; ck_wet_days() is the ETCCDI precipitation index. Both function-level documentation pages cross-reference the other.

Discovery surfaces

• ck_etccdi_27() returns the canonical 27 ‘ETCCDI’ indices as a data frame with code, name, variable, unit, definition, ck_function, and status columns. Use it to audit coverage or to locate the function for a given short code.
• ck_catalogue() returns the full implementation catalogue (51 rows). ck_browse(sector, standard, search) filters by sector (‘agriculture’, ‘health’, ‘water’, ‘energy’), standard (‘ETCCDI’, ‘ET-SCI’, ‘agroclimatic’, etc.), or free-text search.

Gridded support

• ck_apply_grid(x, fun, dates, ...) applies any ck_* function over the cells of a ‘terra’ ‘SpatRaster’ and returns a SpatRaster with one layer per output period.
• ck_from_netcdf(path, var) is a thin convenience wrapper around terra::rast() for ‘netCDF’ inputs with file-existence and argument validation.
• ‘terra’ and ‘ncdf4’ are in ‘Suggests’; loading climatekit alone does not pull them in.

Documentation

• inst/CITATION provides ‘bibentry’ records for the package and for Alexander et al. (2006) and Zhang et al. (2011).
• ‘CITATION.cff’ at the repository root supports GitHub’s citation widget.
• New vignette climdex-migration documents the function-name crosswalk from ‘climdex.pcic’ to climatekit, plus interface-shift notes (numeric-vector inputs, tidy data-frame outputs, default reference period).

Documented limitations

• The percentile-based indices use the standard ±2-day calendar window but do not implement the Zhang et al. (2005) in-base bootstrap. Years inside the reference period therefore have a small self-inclusion bias. This is documented in each function’s documentation page.

climatekit 0.1.0

• Initial release.
• 10 temperature indices: frost days, ice days, summer days, tropical nights, growing season length, heating/cooling/growing degree days, diurnal temperature range, warm spell duration.
• 8 precipitation indices: consecutive dry/wet days, total precipitation, heavy/very heavy precipitation days, max 1-day and 5-day precipitation, precipitation intensity (SDII).
• 3 drought indices: Standardized Precipitation Index (SPI), Standardized Precipitation-Evapotranspiration Index (SPEI), potential evapotranspiration (Hargreaves method).
• 5 agroclimatic indices: Huglin, Winkler, Branas, first/last frost dates.
• 4 comfort indices: wind chill, heat index, humidex, fire danger index.
• Generic dispatcher ck_compute() for programmatic index selection.
• ck_available() and ck_metadata() for index discovery.
• ck_convert_temp() for temperature unit conversion.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.