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Utah chill unit accumulation: negation band sign · case 03

Mild 16 to 18 degC afternoons add chill instead of removing it.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Hourly degC readings (None = missing hour, skipped with no effect). Units: <=1.4:0, <=2.4:0.5, <=9.1:1, <=12.4:0.5, <=15.9:0, <=18.0:-0.5, else -1. The running total is floored at zero after every hour. Return the total.

Why this case matters

Orchard dormancy and bloom forecasts depend on accumulated chill units.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
orchard night 14	`2.5`	`0.0`	Failed

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