l can't invoke onResponse() method. Only onFailure method invoked

public class MainActivity extends ActionBarActivity {

    public static final String TAG = MainActivity.class.getSimpleName();
    public CurrentWeather mCurrentWeather;

    @InjectView(R.id.timeLabel) TextView mTimeLabel;
    @InjectView(R.id.temperatureLabel) TextView mTemperatureLabel;
    @InjectView(R.id.humidityValue) TextView mHumidityValue;
    @InjectView(R.id.precipValue) TextView mPrecipValue;
    @InjectView(R.id.summaryLabel) TextView mSummaryLabel;
    @InjectView(R.id.iconImageView) ImageView mIconImageView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.inject(this);
        String apiKey = "d6f19c3a3f27d3b7a16266bf79b6fc25";
        double latitude =37.8267;
        double longitude = -122.423;

        String forecastUrl = "https://api.forecast.io/forecast/"+apiKey+"/"+latitude+","+longitude;

        if(isNetworkAvailable()) {
            OkHttpClient client = new OkHttpClient();
            Request request = new Request.Builder().url(forecastUrl).build();
            Call call = client.newCall(request);
            call.enqueue(new Callback() {
                @Override
                public void onFailure(Request request, IOException e) {
                    Log.d(TAG,"onFailure");
                    mTemperatureLabel.setText("51");
                }

                @Override
                public void onResponse(Response response) throws IOException {
                    try {
                        Log.d(TAG,"onResponse");
                        String jsonData = response.body().string();
                        Log.v(TAG, jsonData);
                        if (response.isSuccessful()) {
                            Log.d(TAG,"isSuccessFul");
                            mCurrentWeather = getCurrentDetails(jsonData);
                            runOnUiThread(new Runnable() {
                                @Override
                                public void run() {
                                    Log.d(TAG,"how far here");
                                    updateDisplay();
                                }
                            });

                        } else {
                            alertUserAboutError();
                        }
                    }
                    catch (IOException e){
                        Log.e(TAG, "Exception caught ", e); //
                    }
                    catch (JSONException e) {
                        Log.e(TAG, "Exception caught ", e);
                    }


                }
            });
        }
        else{
            Toast.makeText(this,getString(R.string.network_unavailable), Toast.LENGTH_LONG).show();
        }
        Log.d(TAG,"Main UI code is running!");

    }

    private void updateDisplay() {
        System.out.println("amai wheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee");
       mTemperatureLabel.setText( mCurrentWeather.getTemperature()+"");
    }

    private CurrentWeather getCurrentDetails(String jsonData) throws JSONException {

        JSONObject forecast = new JSONObject(jsonData);
        String timezone = forecast.getString("timezone");
        Log.i(TAG, " From Json : "+timezone);

        JSONObject currently = forecast.getJSONObject("currently");

        CurrentWeather currentWeather1 = new CurrentWeather();
        currentWeather1.setHumidity(currently.getDouble("humidity"));
        currentWeather1.setTime(currently.getLong("time"));
        currentWeather1.setIcon(currently.getString("icon"));
        currentWeather1.setPrecipChance(currently.getDouble("precipProbability"));
        currentWeather1.setSummary(currently.getString("summary"));
        currentWeather1.setTemperature(currently.getDouble("temperature"));
        currentWeather1.setTimeZone(timezone);

        Log.d(TAG, currentWeather1.getFormattedTime());
        return  currentWeather1;

    }

    private boolean isNetworkAvailable() {
        ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = manager.getActiveNetworkInfo();
        boolean isAvailable = false;
        if(networkInfo!=null&&networkInfo.isConnected()){
            isAvailable = true;
            Log.d(TAG,"isAvailable");
        }

        return isAvailable;
    }

    private void alertUserAboutError() {
        AlertDialogFragment dialog = new AlertDialogFragment();
        dialog.show(getFragmentManager(),"error_dialog");
    }

}