FA-71032 / Weather index computation / Member archive

Monthly heating and cooling degree days: heating accumulation operand · case 02

HDD totals carry half-degree fractions and disagree with published integer totals.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

daily entries are [tmax_F, tmin_F] with None for missing. A day with a missing value reuses the previous valid daily mean; missing days before any valid day are skipped. Round the daily mean half up to a whole degree, then HDD += 65 - m if m < 65, CDD += m - 65 if m > 65. Return [HDD, CDD].

Why this case matters

Energy billing normalisation and utility demand models use monthly HDD/CDD.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
month 3	`[52.5, 34]`	`[51, 34]`	Failed

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