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Agriculture
Hours whose conditions usually allow spraying and nights with frost risk for a farming area.
General agronomic rules of thumb, not a safety certification. The product label and the measured conditions in the field govern.
Hourly temperature, humidity, wind, gusts, rain probability and cloud cover come from Open-Meteo's forecast for one point in the area. The board groups consecutive daylight hours that meet the general thresholds into windows and pairs each evening with the following morning for frost.
The thresholds are wind 3–15 km/h, gusts up to 20 km/h, temperature 5–28 °C, humidity 50–85% and rain probability under 20%. Hours just outside them are shown as borderline. Calm, very humid hours are treated as unsuitable because that combination hides a possible inversion.
Frost is a watch, not a forecast of damage: it counts night hours at or below 2 °C at two metres, which differs from ground temperature in the field.
No. The product label, the application permit, wind direction, buffer zones and the conditions you measure in the field always prevail. Never spray in an inversion or against the label.
Calm air with high humidity often means an inversion that traps droplets and carries them off target. The forecast at ten metres cannot resolve it, so the hour is excluded.
Not necessarily. Air temperature at two metres below 2 °C is a watch level; damage depends on the crop, its stage, the soil and the actual field temperature.
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