File: change-in-first-leaf_1991-2020_versus_1901-2000_2000px.png

Image caption

First leaf date in 1991-2020 compared to the 20th-century average (1901-2000). Orange shows places where the first leaf of lilacs and honeysuckles emerged earlier than the long-term average; purple shows places where leaves were later than the long-term average. NOAA Climate.gov map, based on analysis by Mark D. Schwartz, University of Wisconsin-Milwaukee.