Yahoo Weather codes http://developer.yahoo.com/weather/#codes to http://erikflowers.github.io/weather-icons/ icons.

weathericon

function setWeatherIcon(condid) {
  var icon = '';
      switch(condid) {
        case '0': icon  = 'wi-tornado';
          break;
        case '1': icon = 'wi-storm-showers';
          break;
        case '2': icon = 'wi-tornado';
          break;
        case '3': icon = 'wi-thunderstorm';
          break;
        case '4': icon = 'wi-thunderstorm';
          break;
        case '5': icon = 'wi-snow';
          break;
        case '6': icon = 'wi-rain-mix';
          break;
        case '7': icon = 'wi-rain-mix';
          break;
        case '8': icon = 'wi-sprinkle';
          break;
        case '9': icon = 'wi-sprinkle';
          break;
        case '10': icon = 'wi-hail';
          break;
        case '11': icon = 'wi-showers';
          break;
        case '12': icon = 'wi-showers';
          break;
        case '13': icon = 'wi-snow';
          break;
        case '14': icon = 'wi-storm-showers';
          break;
        case '15': icon = 'wi-snow';
          break;
        case '16': icon = 'wi-snow';
          break;
        case '17': icon = 'wi-hail';
          break;
        case '18': icon = 'wi-hail';
          break;
        case '19': icon = 'wi-cloudy-gusts';
          break;
        case '20': icon = 'wi-fog';
          break;
        case '21': icon = 'wi-fog';
          break;
        case '22': icon = 'wi-fog';
          break;
        case '23': icon = 'wi-cloudy-gusts';
          break;
        case '24': icon = 'wi-cloudy-windy';
          break;
        case '25': icon = 'wi-thermometer';
          break;
        case '26': icon = 'wi-cloudy';
          break;
        case '27': icon = 'wi-night-cloudy';
          break;
        case '28': icon = 'wi-day-cloudy';
          break;
        case '29': icon = 'wi-night-cloudy';
          break;
        case '30': icon = 'wi-day-cloudy';
          break;
        case '31': icon = 'wi-night-clear';
          break;
        case '32': icon = 'wi-day-sunny';
          break;
        case '33': icon = 'wi-night-clear';
          break;
        case '34': icon = 'wi-day-sunny-overcast';
          break;
        case '35': icon = 'wi-hail';
          break;
        case '36': icon = 'wi-day-sunny';
          break;
        case '37': icon = 'wi-thunderstorm';
          break;
        case '38': icon = 'wi-thunderstorm';
          break;
        case '39': icon = 'wi-thunderstorm';
          break;
        case '40': icon = 'wi-storm-showers';
          break;
        case '41': icon = 'wi-snow';
          break;
        case '42': icon = 'wi-snow';
          break;
        case '43': icon = 'wi-snow';
          break;
        case '44': icon = 'wi-cloudy';
          break;
        case '45': icon = 'wi-lightning';
          break;
        case '46': icon = 'wi-snow';
          break;
        case '47': icon = 'wi-thunderstorm';
          break;
        case '3200': icon = 'wi-cloud';
          break;
        default: icon = 'wi-cloud';
          break;
      }
  
      return '<i class="wi '+icon+'"></i>';
}