Your getWeatherDataForCities
function won't return anything because ajax operations are asynchronous. You need to use a callback for that.
Modify your function to accept a callback function:
function getWeatherDataForCities(cityArray, callback){
var arrAllrecords = [];
var toDaysTimestamp = Math.round((new Date()).getTime() / 1000) - (24*60*60);
for(var i in cityArray){
for(var j=1; j<=2; j++){
var jsonurl = "http://api.openweathermap.org/data/2.5/history/city?q="+cityArray[i]+"&dt="+toDaysTimestamp;
$.ajax({
url: jsonurl,
dataType: "jsonp",
mimeType: "textPlain",
crossDomain: true,
contentType: "application/json; charset=utf-8",
success: function(data){
arrAllrecords[j]["cityName"] = data.list[0].city.name;
arrAllrecords[j]["weather"] = data.list[0].weather[0].description;
// call the callback here
callback(arrAllrecords);
}
});
toDaysTimestamp = toDaysTimestamp - (24*60*60);
}
}
}
And use it like this:
$(document ).ready(function() {
var cityArray = new Array();
cityArray[0] = "pune";
getWeatherDataForCities(cityArray, function(arrAllrecords) {
// Do something with your data
});
});