Here's what I see in ajaxCUwx.js when I load your site :
// -- begin settings --------------------------------------------------------------------------
var flashcolor = '#00CC00'; // color to flash for changed observations RGB
var flashtime = 2000; // miliseconds to keep flash color on (2000 = 2 seconds);
var reloadTime = 5000; // reload AJAX conditions every 5 seconds (= 5000 ms)
var maxupdates = 12; // Maxium Number of updates allowed (set to zero for unlimited)
// maxupdates * reloadTime / 1000 = number of seconds to update
var realtimeFile = 'realtime.txt'; // URL location of realtime.txt relative to document root of website
var ajaxLoaderInBody = false; // set to true if you have <body onload="ajaxLoader(..."
var imagedir = './ajax-images'; // place for wind arrows, rising/falling arrows, etc.
var useunits = 'E'; // 'E'=USA(English) or 'M'=Metric
var decimalComma = false; // =false for '.' as decimal point, =true for ',' (comma) as decimal point
var useFeelslike = 0; // =0 use HeatIndex, =1 use Humidex, =2 use apparent temperature
var useKnots = false; // set to true to use wind speed in Knots (otherwise
// wind in km/hr for Metric or mph for English will be used.
var useMPS = false; // set to true for meters/second for metric wind speeds, false= km/h
var useMPH = true; // set to true to force MPH for both English and Metric units
var useFeet = true; // set to true to force Feet for height in both English and Metric
var usehPa = false; // set to true to force hPa for baro in both English and Metric
var showUnits = true; // set to false if no units are to be displayed
var showDateMDY = false; // set to false to show date as dd/mm/yy
var thermometer = './thermometer.php'; // script for dynamic thermometer PNG image (optional)
// optional settings for the Wind Rose graphic in ajaxwindiconwr as wrName + winddir + wrType
var wrName = 'wr-'; // first part of the graphic filename (followed by winddir to complete it)
var wrType = '.png'; // extension of the graphic filename
var wrHeight = '58'; // windrose graphic height=
var wrWidth = '58'; // windrose graphic width=
var wrCalm = 'wr-calm.png'; // set to full name of graphic for calm display ('wr-calm.gif')
// -- end of settings -------------------------------------------------------------------------
"useunits" needs to be 'M' Double check other settings (e.g. useFeet) to make sure they are what you want.