Fig. 1: During winter time the Brougier Park is rarely used for swimming and having picnic. Later we went diving here. The water was warmer than the air. — EXIF: iPhone SE; Δt=1/121 s; f=4.15 mm; f/2.2; ISO 25; 2017-01-08 10:06:04
Fig. 2: At dive site Riedsort nearby Weggis. The water of Lake Lucerne was about 6 °C kalt — warmer than the air. After diving it started to snow. — EXIF: iPhone SE; Δt=1/223 s; f=4.15 mm; f/2.2; ISO 25; 2017-12-10 12:05:38
