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This pair of line graphs shows how average daily temperature at two locations influenced leaf and bloom timing in similar ways this spring. In Bradford, Pennsylvania, (top) both March and April had many days with well above average temperatures, leading to leaf-out coming 10 days earlier than average and flowering 8 days earlier than average. In coastal Oregon (bottom), temperatures were mostly below average in February and March, and both leaves and flowers appeared a couple of days later than average. NOAA Climate.gov graph, based on data from NOAA Northeast Regional Climate Center and the U.S. National Phenology Network.