Chill hours + Utah units API

Computes fruit-tree dormancy chill accumulation from an array of hourly temperatures using both the 0-7.2C chill-hours model and the weighted Utah chill-units model. Answers 'How many chill hours did this day provide?', 'Did my orchard meet its chilling requirement?'.

Price$0.06per request

MethodPOST

Route/v1/climate/chill-hours

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

chill-hoursutah-modelagronomydormancyorchardfruit-treeschillingagriculture

API URLhttps://x402.hexl.dev/v1/climate/chill-hours

Integration docs

Example request

{
  "hourlyTempsC": [
    2,
    5,
    7,
    1,
    3,
    10,
    12,
    0.5
  ]
}

Example response

{
  "chillHours": 6,
  "utahChillUnits": 4.5,
  "hoursCounted": 8,
  "interpretation": "6 chill hours (0–7.2°C model); 4.5 Utah chill units accumulated.",
  "formula": "Chill hours = count of hours with 0<T<=7.2°C; Utah model = weighted sum by temperature band"
}

Input schema

{
  "type": "object",
  "required": [
    "hourlyTempsC"
  ],
  "properties": {
    "hourlyTempsC": {
      "type": "array",
      "items": {
        "type": "number"
      },
      "description": "Hourly temperatures in Celsius",
      "examples": [
        [
          2,
          5,
          7,
          1,
          3,
          10,
          12,
          0.5
        ]
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}