var baseLayers = {
  "Esri": {
    "WorldStreetMap": L.tileLayer.provider('Esri.WorldStreetMap'),
    "DeLorme": L.tileLayer.provider('Esri.DeLorme'),
  }
};
var overlayLayers = {
  "Weather": {
    "OpenWeatherMap Clouds": L.tileLayer.provider('OpenWeatherMap.Clouds'),
    "OpenWeatherMap Precipitation": L.tileLayer.provider('OpenWeatherMap.Precipitation'),
    "OpenWeatherMap Rain": L.tileLayer.provider('OpenWeatherMap.Rain'),
    "OpenWeatherMap Pressure": L.tileLayer.provider('OpenWeatherMap.Pressure'),
    "OpenWeatherMap Wind": L.tileLayer.provider('OpenWeatherMap.Wind')
  }
};
map.addControl( new L.Control.CategorizedLayers(baseLayers, overLayers, {collapsed: false}) );