According to Science News, city temperatures during one five - month period were measured to be “on average, 2.28 ° C [4.10 ° Fahrenheit] warmer than they were at spots about 10 km [6 miles] away from each urban center. ”
وتذكر المجلة انه بعد قياس الحرارة في المدن خلال خمسة اشهر وُجد انها « ادفأ بمعدل ٢٨‏,٢ درجة مئوية اذا ما قورنت بالمناطق التي تبعد عنها ١٠ كيلومترات » .‏