Fig. 1: Spring temperature anomaly (A), cold snap anomaly (B), and heatwave anomaly (C) for the North American spatial extent studied over the years 1995–2020.
From: Inconsistent shifts in warming and temperature variability are linked to reduced avian fitness
Spring temperature anomaly is defined as the average of April, May, and June using data from the Berkeley Earth Project measured in degrees C compared to the baseline period of 1950–1980. Cold snap anomaly is the difference in average timing of the latest three-day period in which temperatures did not rise above 17.4 C from 1995 to 2020 compared to the average date of the latest cold snap from 1950 to 1980, measured in days. Heatwave anomaly is the difference in timing of the earliest three-day period in which temperatures always rose above 32.1 C from 1995 to 2020 compared to the average date of the earliest heatwave from 1950–1980, measured in days. Gray cells indicate regions with missing data.
