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Historical trend analysis of phenology dates across the Western US from 1982 to 2016

Published by Climate Adaptation Science Centers | Department of the Interior | Metadata Last Checked: July 18, 2025 | Last Modified: 2021-04-26
These data represent key phenology trends across the western United States from 1982-2016. Using two remote sensing datasets, CMGLSP and VIPPHEN-EVI2, trends were calculated for four phenology variables: Start of Season (SOS), Peak Instantaneous Rate of Green-Up Date (PIRGd), Peak of Season (POS), and End of Season (EOS). The Theil-Sen slope was applied to the phenology metrics, as well as the standard deviation, to give an indication of how phenology dates, as well as variations, are changing throughout time. The Mann-Kendall test was also applied to give an indication of trend significance. Lastly, we include the mean and standard deviation of each metric across the time period.

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