{"uid":"cap_dkVybVATxy-6HNiurih0x","slug":"farm-garden-calc-growing-degree-days-gdd-90444770","name":"Farm & Garden Calc – Growing Degree Days (GDD)","description":"Growing degree days from daily max and min temperatures: modified corn 86/50 F method or the simple standard average.","url":"https://agri-calc.x402tookit.com/gdd?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["tmax","tmin"],"properties":{"base":{"type":"number","description":"Base temperature (default 50 F or 10 C)"},"tmax":{"type":"string","description":"Comma-separated daily maximum temperatures"},"tmin":{"type":"string","description":"Comma-separated daily minimum temperatures, same count as tmax"},"unit":{"type":"string","description":"F (default) or C"},"upper":{"type":"number","description":"Upper cutoff for the modified method (default 86 F or 30 C)"},"method":{"type":"string","description":"modified (default: temps clamped into base..upper, the corn 86/50 F method) or standard (plain average minus base, floor 0)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"base":{"type":["null","number"]},"days":{"type":["null","number"]},"unit":{"type":["null","string"]},"upper":{"type":["null","number"]},"method":{"type":["null","string"]},"source":{"type":["null","string"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"dailyGdd":{"type":["array","null"],"items":{"type":"number"}},"degraded":{"type":["boolean","null"]},"totalGdd":{"type":["null","number"]},"disclaimer":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"cumulativeGdd":{"type":["array","null"],"items":{"type":"number"}}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_FuDrYE1pf1u4_NO9I94cN","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calculates growing degree days from daily max/min temperatures using either the modified corn 86/50°F method or the standard average method.","exampleAgentPrompt":"Calculate growing degree days for my corn crop using the modified 86/50°F method — here are my daily highs and lows for the last week: tmax = 88,85,90,83,79,86,91 and tmin = 55,52,58,50,48,54,57.","exampleUseCases":[{"title":"Corn phenology tracking for season","prompt":"I've got two weeks of temperature data for my cornfield. Daily highs: 85,88,90,83,79,86,91,88,84,82,87,89,92,86 and daily lows: 54,57,60,50,48,52,56,55,51,49,53,58,61,55. Calculate cumulative GDD using the modified corn 86/50 F method so I can estimate where my crop is in development."},{"title":"Home garden heat unit accumulation","prompt":"Can you compute growing degree days for my tomato garden this month using the standard method with a base of 50°F? My daily highs were 78,82,80,75,77,83,85,81 and lows were 55,58,56,52,54,59,61,57."},{"title":"Celsius GDD calculation for wheat crop","prompt":"Calculate GDD in Celsius for my wheat field using the standard method with a base of 10°C. Max temps: 22,25,27,20,18,24,26 and min temps: 10,12,14,9,8,11,13."}],"resultDescription":"Returns an array of daily GDD values, a cumulative GDD array, the total accumulated GDD, the method and base/upper temperatures used, the temperature unit, a human-readable summary, and optionally reasons or warnings about the calculation.","failureModes":["Missing tmax or tmin parameters returns an error","Mismatched count between tmax and tmin arrays causes failure","Invalid temperature values or non-numeric strings cause parsing errors","Unsupported method string (not 'modified' or 'standard') may result in default fallback or error","Unsupported unit string (not 'F' or 'C') may cause unexpected behavior"],"whenToPreferThis":"Choose this endpoint when you need to compute growing degree days from raw daily temperature observations, especially when you want the industry-standard modified corn 86/50°F method with upper and lower temperature clamping. It is ideal for tracking crop phenological development, scheduling agricultural operations, or building season-long GDD accumulation charts from historical or forecast temperature data.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T13:12:41.050Z","isFirstParty":false,"canonicalSlug":"farm-garden-calc-growing-degree-days-gdd-90444770"}