Huglin Heliothermal Index Calculator
Declared Huglin heliothermal sum k×Σmax(0,((Tmean−10)+(Tmax−10))/2), actual independently complete applicable growing-season days and latitude/daylength coefficient; not Winkler GDD, wine-quality classification, or guaranteed ripening forecast.
Description
The declared Huglin index combines daily mean and maximum temperatures with a latitude and daylength coefficient.
The declared Huglin index combines daily mean and maximum temperatures with a latitude and daylength coefficient.1
Meaningful seasonal comparisons require complete, matched daily coverage and the same coefficient convention.
When to use Huglin Heliothermal Index Calculator
Use this tool to apply the stated huglin heliothermal index calculator operation with an explicit input and unit basis.
How to use Huglin Heliothermal Index Calculator and how it works
- Establish the measurement basis and units described above.
- Enter actualCompleteSeasonDailyMeanC, actualCompleteSeasonDailyMaximumC, callerIndependentLatitudeDaylengthCoefficient and run the tool.
- Read result.conditionalHuglinIndex using the output meanings below.
- If input is rejected, correct the stated type, range, ordering or alignment issue and rerun; review successful results under the declared convention.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| actualCompleteSeasonDailyMeanC | Complete season daily mean c, on the basis specified in the algorithm. | array of number | required; dense; align related rows as specified; further conditions in the algorithm |
| actualCompleteSeasonDailyMaximumC | Complete season daily maximum c, on the basis specified in the algorithm. | array of number | required; dense; align related rows as specified; further conditions in the algorithm |
| callerIndependentLatitudeDaylengthCoefficient | Latitude daylength coefficient, on the basis specified in the algorithm. | number | required; finite; strictly positive; further conditions in the algorithm |
Require aligned nonempty daily arrays, maximum at least mean on every day, and positive coefficient k. Sum max(0,(mean+maximum−20)/2), then multiply by k.
index = k × Σ max(0, (Tmean + Tmax − 20)/2) Apply the declared units, ordering and branch conditions.
| Output field | Meaning | Value type |
|---|---|---|
| result | Object containing the declared output fields. | object |
| result.conditionalHuglinIndex | Declared seasonal heat index in the calibrated degree-day convention. | number |
{
"input": {
"actualCompleteSeasonDailyMeanC": [
15,
20
],
"actualCompleteSeasonDailyMaximumC": [
20,
25
],
"callerIndependentLatitudeDaylengthCoefficient": 1
},
"output": {
"result": {
"conditionalHuglinIndex": 20
}
}
}Limitations and assumptions
The output applies the declared operation to the values you supply. Establish the measurement basis, units, coefficients and any caller-selected rules before interpreting it. The tool does not independently collect or verify observations or decide whether a model or reference applies.
Supply explicit required fields with the documented types and dense aligned arrays. Unknown fields, wrong types and nonfinite numbers are rejected. Branch-specific constraints are explained above. A successful false boolean, negative signed difference, empty slice or unresolved tie is distinct from an input error. Very large inputs or outputs may be rejected by shared resource limits.
Alternative or Complementary methods
For a related operation, use Winkler Region Classification Lookup. Winkler regions organize vineyard climates by accumulated heat over a defined growing season.
For a related operation, use Biologically Effective Degree Days BEDD Calculator. Biologically effective degree days depend on a named formulation and its treatment of weather, latitude and daylength.
References
-
Huglin Heliothermal Index Calculator — tool.io
Similar or alternative tools
- Winkler Region Classification Lookup
Winkler regions organize vineyard climates by accumulated heat over a defined growing season.
- Biologically Effective Degree Days BEDD Calculator
Biologically effective degree days depend on a named formulation and its treatment of weather, latitude and daylength.