Philadelphia has a humid continental climate with four distinct seasons. Winters are cold and often snowy, with temperatures usually hovering around 32°F (0°C) during the colder months. Average annual snowfall is 24 inches (59 cm) which is spread out mainly from December to March. The area is sometimes hit by devastating blizzards that can dump up to half that total or even more on the city in one day, such as in 1996 when a single storm dumped 30.7 inches (78 cm) of snow on the city in just a couple days.

Spring and fall are rather pleasant, with temperatures in the 60s and 70s F (15°C-25°C). Summers are hot and humid, and conditions can get quite unpleasant when the air temperature is near 90°F (32°C) and humidity is high.

Complete the sentence by gathering relevant information from the above passage.

In Philadelphia, the most pleasant season(s) is/are_____________________