This is the exact same way you would normally find the darkest parts of the image when you're removing any color casts from the shadow areas, but now, thanks to the Difference blend mode, these darkest areas represent the areas closest to midtone gray.
The warmest sea in Key Largo in March is 26Â°C/79Â°F, and the coldest sea temperature in March is 22Â°C/72Â°F. Average water temperature in Key Largo in March is 24Â°C/75Â°F. You can choose any other years:
Punta Cana Water Sea Temperature in March, Â°F. The average sea surface temperature in March 2017 for Punta Cana was 82.8Â°F. The maximum and minimum values were 82.0Â°F and 83.6Â°F respectively. Sunny, Cloudy and Gloomy days. Most of the days in March are sunny but you can also expect cloudy and gloomy days.