Fig. 2. Average number of growing degree-days (base 10°C) accumulated between 1 April and 30 September (inclusive), over the 1979 to 2005 time period. The calculation used the daily average temperature from the National Centers for Environmental Prediction (NCEP) Reanalysis gridded climate data, available from the National Oceanic and Atmospheric Administration (NOAA) CIRES Climate Diagnostics Center in Boulder, CO (http://www.cdc.noaa.gov; verified 19 Dec. 2007).