Included from trend description:
This retrieves the air and water temperature for the last day from NOAA Station ID=8443970 located in Boston MA. For more information please visit http://tidesandcurrents.noaa.gov. It then saves the mean water temperature for trendy to display.
% Average Water Temperature in Boston % time vector is: time1279 % data vector is: data1279 plot(time1279,data1279, 'o-'); ylabel('Degrees in Fahrenheit'); title('Water Temp in Boston'); datetick