Increase cohesion by reusing a PHP function for multiple RSS feeds

Question

My homepage contains weather for three cities around the world as displayed in the image

In the home page I declare 3 variables storing the RSS URL for each city

$newYorkWeatherSource = 'http://weather.yahooapis.com/forecastrss?p=USNY0996&u=f';
$londonWeatherSource = 'http://weather.yahooapis.com/forecastrss?p=UKXX0085&u=c';
$parisWeatherSource = 'http://weather.yahooapis.com/forecastrss?p=FRXX0076&u=c';

I pull identical tags out of the three URL's displayed above and use 3 identical functions apart apart from the variable passed into it.

Below shows the variable being passed into the function. Obviously other functions are used before $weather can be returned.

function new_york_current_weather($newYorkWeatherSource) {

// Get XML data from source
if (isset($newYorkWeatherSource)) {
    $feed = file_get_contents($newYorkWeatherSource);
} else {
    echo 'Feed not found.  Check URL';
}

checkWeatherFeedExists($feed);
$xml = new SimpleXmlElement($feed);

$weather = get_dateTime($xml);
$weather = get_temperature_and_convert($xml);
$weather = get_conditions($xml);
$weather = get_icon($xml);

return $weather;
}

As I mentioned, I current repeat this function 3 times just replacing the $newYorkWeatherSource variable that is passed in the above example. Any ideas how I could reuse this function 3 times but yet pass in different URL to keep my homepage showing weather from the 3 cities? Ofcourse, it's easy to reuse the function if each city was represented on individual pages but the purpose is to keep them together for comparison.

Any ideas?

Thanks in advance.