FA-70909 / Weather index computation / Member archive

Humidex with discomfort band: integer rounding · case 04

Published humidex is one point low about half the time and can land in a milder band.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Input air temperature and dew point in degC. If dew point exceeds air temperature return None. e = 6.11*exp(5417.7530*(1/273.16 - 1/(273.15+Td))); H = T + 0.5555*(e - 10); report the humidex rounded half up to an integer and a band on that integer: <30 comfortable, 30-39 some discomfort, 40-45 great discomfort, 46-53 dangerous, >=54 heat stroke imminent.

Why this case matters

Summer heat bulletins publish humidex with a discomfort band.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
air 28 C dew point 20 C	`[35, "some discomfort"]`	`[36, "some discomfort"]`	Failed

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