Chill hour

{
  "id": "MLC-T-MET-004273",
  "term": "Chill hour",
  "field": "Meteorology and atmospheric science",
  "definition": "A unit of measure used in agriculture to quantify the cumulative exposure of a dormant plant to cold temperatures required for it to break dormancy and flower properly. One chill hour is counted for each hour the temperature is below a certain threshold but above freezing, with the effective range being approximately 0 to 7 degrees Celsius (32 to 45 degrees Fahrenheit). Different fruit and nut trees have specific chill hour requirements that must be met for successful fruit production.",
  "url": "https://mlchart.com/terminology/meteorology/chill-hour/"
}