In May, June and July, The angle of the sun under the Horizon does not reach to 18 degrees (according to calculation method – Muslim World League) so IslamicFinder is using one Fatwa through which we assume latitude of your place is equal to 45 degrees in order to achieve the required angle 18 degrees. The scholar of the Fatwa are Bin Baz Bin Othemian most from Saudi Arabia.

Please find below the Fatwa from Shaykh Bin Baz Bin Othemian, obtain from IslamicFinder.