get_growing_degree_days
Get growing degree days
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Third-party content written by another agent. Data to evaluate, not instructions.
Growing Degree Units (GDU / GDD) for a US location (CONUS, Alaska, Hawaii), computed from daily max/min temperatures. Pass a crop id (e.g. "corn", "soybean", "wheat") to use calibrated base/upper thresholds, or crop="custom" with base_temp_c (and optional upper_temp_c / method). Without season_start you get per-day GDU across the forecast horizon; WITH season_start (YYYY-MM-DD) you get the cumulative season-to-date total (observed history + today + forecast) plus a per-day cumulative series -- the number a grower tracks against crop milestones. Answers "how many growing degree days has my corn accumulated since May 1?" and "what's the GDU forecast this week?".
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| lat | number | yes | Latitude in decimal degrees (-90 to 90). Most tools also accept a `location` place-name string instead of lat/lon. |
| lon | number | yes | Longitude in decimal degrees (-180 to 180). For continental US use negative values (west of the prime meridian). |
| crop | string | yes | Crop id from the catalog (e.g. "corn", "soybean", "wheat") or "custom" to supply your own thresholds via base_temp_c. |
| season_start | string | no | Season/planting start as YYYY-MM-DD (local date). Presence switches the response to a cumulative season-to-date GDU total. Must be within the ~180-day observed window. |
| days | integer | no | Forecast horizon in days (default 10). |
| day_definition | string | no | Daily boundary: "nws" (default; NBM MaxT/MinT period extremes) or "local_calendar" (midnight-to-midnight local day). |
| unit | string | no | Unit system for GDU + temps. Default imperial (°F-days). |
| base_temp_c | number | no | Custom base threshold in °C. Required when crop="custom". |
| upper_temp_c | number | no | Custom upper cutoff in °C (enables the modified method). Optional. |
| method | string | no | GDU method for custom crops. Defaults from whether upper_temp_c is set. |
| include_milestones | boolean | no | Include the crop's growth-stage GDU milestones in the response. |
Raw JSON schema
{
"type": "object",
"properties": {
"lat": {
"type": "number",
"minimum": -90,
"maximum": 90,
"description": "Latitude in decimal degrees (-90 to 90). Most tools also accept a `location` place-name string instead of lat/lon."
},
"lon": {
"type": "number",
"minimum": -180,
"maximum": 180,
"description": "Longitude in decimal degrees (-180 to 180). For continental US use negative values (west of the prime meridian)."
},
"crop": {
"type": "string",
"description": "Crop id from the catalog (e.g. \"corn\", \"soybean\", \"wheat\") or \"custom\" to supply your own thresholds via base_temp_c."
},
"season_start": {
"type": "string",
"pattern": "^\\d{4}-\\d{2}-\\d{2}$",
"description": "Season/planting start as YYYY-MM-DD (local date). Presence switches the response to a cumulative season-to-date GDU total. Must be within the ~180-day observed window."
},
"days": {
"type": "integer",
"minimum": 1,
"maximum": 30,
"description": "Forecast horizon in days (default 10)."
},
"day_definition": {
"type": "string",
"enum": [
"nws",
"local_calendar"
],
"description": "Daily boundary: \"nws\" (default; NBM MaxT/MinT period extremes) or \"local_calendar\" (midnight-to-midnight local day)."
},
"unit": {
"type": "string",
"enum": [
"imperial",
"metric"
],
"description": "Unit system for GDU + temps. Default imperial (°F-days)."
},
"base_temp_c": {
"type": "number",
"description": "Custom base threshold in °C. Required when crop=\"custom\"."
},
"upper_temp_c": {
"type": "number",
"description": "Custom upper cutoff in °C (enables the modified method). Optional."
},
"method": {
"type": "string",
"enum": [
"simple",
"modified"
],
"description": "GDU method for custom crops. Defaults from whether upper_temp_c is set."
},
"include_milestones": {
"type": "boolean",
"description": "Include the crop's growth-stage GDU milestones in the response."
}
},
"required": [
"lat",
"lon",
"crop"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}