The graph below shows a time series of temperature measurements (vertical axis) covering the 20 minute period of the swim (horizontal axis). The water temperature measurements covered a span of about 1°C.
The map below shows colour coded temperature measurements. A step of one colour corresponds to a temperature change of 0.1°C.
The same data can be viewed interactively on this map. Clicking on a circle brings up a pop-up which shows the temperature measurement at that point.
The lowest temperatures (~12.8°C) were observed furthest from shore.
The highest temperatures (>13.8°C at 11:20 outbound and >13.6 at 11:36 inbound) were both observed at a similar distance from shore (shown as dark browns and purples).