Fig. 2
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Surface temperatures (Celsius, °C) versus calendar date (MM/DD) at Lake Geneva sites sampled during 2016 and Lake Superior sites during 2018. The Lake Geneva temperatures are the averages from 0–1 m depths from water column profiles and the thermistor positioned at 1m depth at the National Research Institute for Agriculture, Food and the Environment laboratory (INRAE) laboratory break wall (Fig. 1). The Lake Superior temperatures are the average of 24-hourly recordings measured by a data logger deployed at the surface at a single site (Mini-logger; Fig. 1).
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