Guadalajara enjoys a Mediterranean climate  with continental influences for being well inland at 700 meters above sea level. Summers are hot with relatively cool nights, while winters are cool with cold nights. The lowest temperature ever recorded in Guadalajara is −12.5 °C  in January 12, 2009. The highest temperature ever recorded is 43.5 °C  in August 10, 2012.
Question: Which season has cooler nights, summer or winter?
Answer: winter