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Exemplary weather and sound parameters in the first hour after sunset (at 10 p.m.) in July 2016 in Konstanz, Germany. (a) Temperature and relative humidity, (b) atmospheric attenuation for sound frequencies of 20, 40, 60, 80 and 100 kHz, (c) speed of sound in air. Note that atmospheric attenuation is mostly determined by sound frequency, but also varies with weather conditions differently for the different frequencies
