Accumulated Growing Degree Days (AGDD)—see chart above—are also ahead. NPN calculated how the accumulated heat for March 19th stacks up to the long-term average (1981-2010) for that day for selected cities across the country (using a 32F base). Check the chart from NPN to see if a city near you is behind or ahead of the long-term average in 2017.
If you’re interested in helping to develop the evidence base for how weather is affecting specific species of plants, sign up for Nature’s Notebook and help by documenting plant species in your area.
April 3, 2017 NewTerrain