Chill Hours

Agriculture Weather Credits / request: 1

Weinberger chill hours: count of hourly temperatures between 0°C and baseTemp (default 7.2°C). Sub-freezing hours are not counted. Comparable to published variety chill requirements. Not a prescription.

GET https://api.apikodu.com/api/v1/agriculture/chillhours

Documentation

Overview

Weinberger chill hours model: count of hours with 0°C ≤ temperature ≤ baseTemp (default 7.2°C). Sub-freezing hours are not counted. Comparable to published variety chill requirements. Requires hourly DB. Not a prescription. Weather data © Copernicus ERA5 / ERA5-Land (contains modified Copernicus Climate Change Service information) / Open-Meteo / OpenWeather / MET Norway.

Authentication

Every request requires the x-api-key header. Credits used and remaining quota are returned in response headers (x-api-credits-used, x-api-remaining-credits, x-rate-limit-*).

Request

GET https://api.apikodu.com/api/v1/agriculture/chillhours?latitude=39.92&longitude=32.87&fromDate=2025-11-01&toDate=2026-02-28&baseTemp=7.2

GET query. POST JSON also accepted.

Parameters

Name	Type	Required	Default	Options	Description
`latitude`	number	* Required	—	—	Latitude -90..90. 0.1° cell.
`longitude`	number	* Required	—	—	Longitude.
`fromDate`	string	* Required	—	—	YYYY-MM-DD
`toDate`	string	* Required	—	—	Max 366 days.
`baseTemp`	number	Optional	`7.2`	—	Upper threshold °C, 0..20. Default 7.2.
`crop`	string	Optional	—	`wheat` `barley` `maize` `sunflower` `cotton` `potato` `tomato` `rapeseed` `oats` `rye` `sugarbeet` `grape` `apple` `chickpea` `lentil`	Informational crop code.
`includeDaily`	boolean	Optional	`true`	`true` `false`	Daily breakdown. Default true.

Response

Name	Type	Description
`chillHours`	integer	Hours with 0°C ≤ temperature ≤ baseTemp (Weinberger).
`hoursEvaluated`	integer	Hours that have a temperature.
`hoursMissing`	integer	Expected hours in the window minus evaluated.
`baseTemp`	number	Threshold used °C.
`crop`	string	Normalized crop. Null if omitted.
`fromDate`	string	YYYY-MM-DD.
`toDate`	string	YYYY-MM-DD.
`gridLatitude`	number	0.1° cell latitude.
`gridLongitude`	number	0.1° cell longitude.
`daily`	array	Daily rows when includeDaily=true.
`daily[].date`	string	YYYY-MM-DD.
`daily[].hoursBelow`	integer	Hours that day with 0°C ≤ temperature ≤ baseTemp.
`daily[].tmin`	number	Day min °C.
`daily[].tmax`	number	Day max °C.
`method`	string	weinberger.
`source`	string	database.
`disclaimer`	string	Decision-support disclaimer.

Errors

HTTP	code	Description
`400`	`-255`	lat/lon missing or out of range.
`400`	`-254`	fromDate/toDate invalid or range > 366.
`400`	`-249`	baseTemp outside 0..20.
`400`	`-250`	Unknown crop.
`429`	`-316`	Daily new location (cell) limit (50) reached. Previously requested locations keep working; new locations next day (UTC). Retry-After header gives seconds until end of day.
`503`	`-256`	Hourly data not ready; Worker is filling.
`400`	`-251`	No cell/hourly data.
`401`	`-100`	x-api-key is missing, empty, malformed, inactive, banned, expired, IP-restricted, or not allowed for this API.
`429`	`-221`	Per-minute request limit exceeded. Response headers: x-rate-limit-limit, x-rate-limit-remaining, x-rate-limit-reset.
`429`	—	Package credit quota cannot cover this request. Body may be { error, limit, currentUsage, requestCost } (no code field).
`500`	`-1`	Unexpected server error. message is a generic error text without technical details.

Notes

Success body is { data: { ... } }. Error body is { code, message }. code is an ApiResponseCode enum value (negative integer).

Sample response

{
  "data": {
    "chillHours": 842,
    "hoursEvaluated": 2880,
    "hoursMissing": 0,
    "baseTemp": 7.2,
    "crop": "apple",
    "fromDate": "2025-11-01",
    "toDate": "2026-02-28",
    "gridLatitude": 39.90,
    "gridLongitude": 32.90,
    "daily": [
      {
        "date": "2025-11-01",
        "hoursBelow": 8,
        "tmin": 2.1,
        "tmax": 12.4
      }
    ],
    "method": "weinberger",
    "source": "database",
    "disclaimer": "Decision support only. Not agronomic advice. Weather data: Copernicus ERA5 / ERA5-Land, Open-Meteo, OpenWeather, MET Norway. Contains modified Copernicus Climate Change Service information."
  }
}

Code samples

  
      const response = await fetch('https://api.apikodu.com/api/v1/agriculture/chillhours', {
        method: 'GET',
        headers: {
          'x-api-key': 'YOUR_API_KEY'
        }
      });

      const data = await response.json();
      console.log(data);

  
      import requests

      headers = {
          'x-api-key': 'YOUR_API_KEY'
      }

      response = requests.get('https://api.apikodu.com/api/v1/agriculture/chillhours', headers=headers)
      print(response.json())

  
      using var client = new HttpClient();
      client.DefaultRequestHeaders.Add("x-api-key", "YOUR_API_KEY");

      var response = await client.GetStringAsync("https://api.apikodu.com/api/v1/agriculture/chillhours");
      Console.WriteLine(response);

  
      $response = file_get_contents('https://api.apikodu.com/api/v1/agriculture/chillhours', false, stream_context_create([
          'http' => [
              'header' => "x-api-key: YOUR_API_KEY"
          ]
      ]));

      print_r(json_decode($response, true));

  
      curl -X GET 'https://api.apikodu.com/api/v1/agriculture/chillhours' \
        -H 'x-api-key: YOUR_API_KEY'

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