Philadelphia is located in the eastern United States and is classified as having a Humid Subtropical/Continental climate, corresponding to the Köppen climate classification Cfa.

The city experiences four distinct seasons: spring is mild with blooming flowers, summer is hot and humid, autumn features cool weather with beautiful foliage, and winter brings cold weather with snowfall. This variability in weather is part of life in Philadelphia, offering different charms in each season.

In terms of temperature, Philadelphia has significant seasonal temperature differences. The average high temperature in July, the hottest month, reaches about 87°F (31°C), and with high humidity, it feels even warmer. Heat advisories may be issued during July and August. In contrast, January, the coldest month, has an average low temperature of about 25-27°F (-4 to -3°C), with subzero temperatures persisting for several days. The annual average temperature is around 55°F (13°C). Spring in April and May, as well as autumn in September and October, are the most suitable times for outdoor activities due to mild and clear weather.

Regarding precipitation, Philadelphia shows a relatively even rainfall pattern throughout the year. The annual average precipitation is about 46 inches (approximately 1,168 mm), which is considerable for an eastern U.S. city. There are no distinct dry or wet seasons, and rain falls evenly throughout the year. Thunderstorms frequently occur in spring and summer, sometimes resulting in heavy downpours in a short period. In autumn, heavy rain may also occur due to the indirect effects of hurricanes. The annual number of rainy days is about 115-120.

Snow is an important aspect of life in Philadelphia during winter. The average annual snowfall is about 22-23 inches (approximately 56-58 cm), which is less than in New York or Boston but more than in Seoul. The snowiest season is from December to March, with significant snowfall particularly in January and February.

In Philadelphia, powerful storms known as Nor'easters can bring substantial snowfall one or two times a season. In the past, there have been instances of over 20 inches (50 cm) of snow from a single snowstorm. During heavy snowfall, road icing and traffic disruptions can occur, making winter vehicle maintenance and snow removal preparations essential.

Due to climate change, Philadelphia is experiencing an increase in the number of summer heatwaves and a trend toward milder winters. During hurricane season (June to November), the city may be affected by hurricanes or tropical storms moving up the Atlantic coast.

Notably, Hurricane Sandy in 2012 caused significant damage to New Jersey and Philadelphia. Current weather information for Philadelphia can be checked in real-time on the National Weather Service Philadelphia office website or on Weather.com and Weather Underground.

Here are some tips for preparing for the weather in Philadelphia. In summer, sunscreen and lightweight breathable clothing are essential, and if there is no air conditioning, it is advisable to use local cooling centers during heatwaves. Starting in autumn, prepare layered clothing, and in winter, it is wise to have a thick coat, waterproof boots, a snow shovel, and ice melt ready in advance.

Those who have just immigrated from Korea may need time to adjust to Philadelphia's humid summers and snowy winters, but they will discover the beautiful nature unique to Philadelphia amid the changing seasons.