FA-71187 / Weather index computation / Member archive

Hargreaves reference evapotranspiration: cold day clamp · case 02

Deep-cold days report negative evapotranspiration.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Daily tmax/tmin degC (tmax >= tmin) and extraterrestrial radiation Ra in MJ/m2/day. Convert Ra to mm/day with 0.408. ET0 = 0.0023*Ra_mm*(Tmean+17.8)*sqrt(tmax-tmin), Tmean=(tmax+tmin)/2; negative results clamp to 0; round to 0.01 mm.

Why this case matters

Irrigation scheduling uses ET0 where full meteorological data are unavailable.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
tmax -12 tmin -30 Ra 10.0	`-0.13`	`0.0`	Failed

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