Weather in json

MyJson.java
===================
package Weather;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.Charset;

public class MyJson {
    public final String API_URL ="https://api.darksky.net/forecast/"; //url of the site
    private String apiKey; //api key from the site
    private String GPSlocation; //gps loaction
    private String rawData; //raw data
    private String fullURL; //full url location
    private String cityName;
    JSONObject jsonObject;

    public MyJson(String apiKey, String GPSlocation, String cityName) throws IOException, JSONException {
        this.apiKey = apiKey;
        this.GPSlocation = GPSlocation;
        this.cityName = cityName;
        //create a full url for the api....
        this.fullURL = API_URL+this.apiKey+"/"+this.GPSlocation;
        //readJsonFromURL();
    }

    private JSONObject readJsonFromURL() throws IOException, JSONException {
        //openm a connection to the internet with input stream
        InputStream is = new URL(this.fullURL).openStream();
        //create a buffer for collection all the data
        BufferedReader buf = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
        //read all data and append it to one happy String
        String jsonText = readAll(buf);
        //convert to json object, so we can use the json power.
        jsonObject = new JSONObject(jsonText);
        //return the json object
        return jsonObject;
    }

    private String readAll(BufferedReader rd) throws IOException{
        //create a string builder
        StringBuilder sb = new StringBuilder();
        //create a char pointer
        int cp;
        while ((cp=rd.read()) != -1) {
            //append the char to our String builder
            sb.append((char) cp);
        }
        //return the result
        rawData=sb.toString();
        return sb.toString();
    }

    //get raw data for testing our communication
    public String getRaw(){
        return rawData;
    }

    private int getClouds(JSONObject cur) throws IOException, JSONException {
        int cloud =(int)(cur.getDouble("cloudCover")*100);
        return cloud;
    }

    private int getTemp(JSONObject cur) throws IOException, JSONException{
        int temp=(int)cur.getDouble("temperature");
        return (int)((temp-32) /1.8);
    }

    public boolean openBoiler(int tolerance,int minTemp) throws IOException, JSONException {
        JSONObject myData = readJsonFromURL();
        JSONObject currently = myData.getJSONObject("currently");

        return getClouds(currently)>tolerance && getTemp(currently)<minTemp;
    }


}



Tester.java
=================
package Weather;

import org.json.JSONException;

import java.io.IOException;

public class Tester {
    public static void main(String[] args) throws IOException, JSONException {
        MyJson myData = new MyJson("0e3a4cef498bc2ad18a97e1817c79e87","50.4019514,30.6727719","Ramat-Gan");
        //System.out.println(myData.getRaw());
        System.out.println("Getting data from the web.");
        //get clouds
        System.out.println("Need to open boiler:"+myData.openBoiler(30));
    }
}