Hargreaves reference evapotranspiration (mm/day) from max and min temperature, l...
https://agri-calc.x402tookit.com/et0-hargreavesOverview
Hargreaves reference evapotranspiration (mm/day) from max and min temperature, latitude and day of year.
Protocol
x402
Price
$0.02
Payment Asset
USD Coin
Payment Network
eip155:8453
Category
uncategorized
Provider
Farm & Garden Calc
Source
bazaar
Indexed
2026-10-20 21:22:40
Health
Status
healthy
Latency (p50)
570ms
Uptime (30d)
86.7%
Reliability Score
83.3/100
Last Checked
2026-10-28 06:38:49
Last Healthy
2026-10-28 06:38:49
Consecutive Failures
0
x402 Payment Validation
Payment Requirements
Valid
Asset Verified
Known USDC
Facilitator
—
Input Schema
{
"method": "GET",
"queryParams": {
"dayOfYear": 246,
"latitude": -20,
"tmaxC": 21.5,
"tminC": 12.3
},
"type": "http"
}
Output Schema
{
"example": {
"asOf": "2026-10-11T23:40:36.036Z",
"degraded": false,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"et0InchesPerDay": 0.12519,
"et0MmPerDay": 3.1797,
"extraterrestrialRadiationMJm2Day": 32.194,
"extraterrestrialRadiationMmDay": 13.135,
"meanTempC": 16.9,
"notChecked": [
"wind, humidity and cloud cover (Hargreaves uses temperature only, so it is rougher than Penman-Monteith)",
"local calibration (accuracy is worse on coastal and humid sites)",
"…1 more"
],
"reasons": [
"ET0 = 0.0023 x (Tmean + 17.8) x sqrt(Tmax - Tmin) x Ra, with Ra the extraterrestrial radiation in mm/day equivalent.",
"A rough estimate from temperature alone; use it for planning, not scheduling to the millimetre."
],
"source": "computed locally (Hargreaves and Samani 1985 with FAO-56 eq. 21 extraterrestrial radiation)",
"summary": "Reference ET0 about 3.18 mm/day (0.125 in/day) at latitude -20, day 246.",
"tempRangeC": 9.2,
"verdict": "ET0_COMPUTED"
},
"type": "json"
}