https://www.meteoblue.com/en/blog/article/show/14655_%D0%92%D1%80%D0%B5%D0%BC%D0%B5%D1%82%D0%BE+%D0%94%D0%B6%D1%83%D0%BB%D1%8E%D0%BD%D0%B8%D1%86%D0%B0+%D0%9E%D0%B1%D0%BB%D0%B0%D1%81%D1%82+%D0%92%D0%B5%D0%BB%D0%B8%D0%BA%D0%BE+%D0%A2%D1%8A%D1%80%D0%BD%D0%BE%D0%B2%D0%BE%2C+Republika+B%C5%ADlgariya