Pennsylvania typically experiences a humid continental climate. However, the state’s diverse geography influences local climate and weather patterns. Westerly winds generally lessen the impact of the Atlantic Ocean, though eastern Pennsylvania still sees its share of storms, floods, and hurricanes. Let’s delve deeper into the region’s climatic characteristics. Read more at philadelphia.name.
Temperature Regimes
Temperatures in Pennsylvania generally range from 0°F to 100°F:
- The average temperature for most of the state is 47°F, while in the north and center, it’s around 57°F.
- The highest recorded temperature in the region was 111°F in Phoenixville in July 1936.
- The lowest temperature, -42°F, was recorded in Smethport in January 1904.
Summers are generally warm, with temperatures typically between 68°F and 74°F. Temperatures exceeding 90°F can occur for up to three weeks a year in the southeast, but rarely last longer than three days in the southwest. Near Lake Erie and at some higher elevations, such temperatures have never been recorded.
During winter, temperatures drop, and average daytime readings can be 0°F or lower. Freezing temperatures can persist for up to 100 days a year, most commonly in the mountains. The coldest months are typically from November to April.
This mild climate supports a rich natural diversity, including many plant species that thrive here, creating a uniquely cozy atmosphere in the state’s cities. It also fosters the development of parkland and promotes urban greening initiatives.
Precipitation: Rain and Snow
Precipitation is fairly evenly distributed across the region, ranging from 34 to 52 inches annually. The wettest periods are typically spring and summer, while February is generally the driest month. The eastern part of the state often receives more precipitation due to coastal storms. In summer, this means heavy rains and thunderstorms; in winter, it can bring abundant snowfall.
Throughout the year, Pennsylvania also experiences up to 35 thunderstorms, most frequently occurring in summer. However, prolonged dry spells can happen in any part of the state at any time of year. While winter precipitation generally decreases, significant snowfalls can occur, with some areas receiving 20 inches or more of snow. In northern parts of the state, snow can be seen from late October through May, though it’s less common in other areas.
The heaviest snowfalls in Pennsylvania typically occur in December, January, and March. The first spring month often doesn’t feel like true spring for residents, as accumulated moisture contributes to substantial snow events.
Regarding hurricanes and tropical cyclones, these are not very frequent in Pennsylvania. Only in eastern Pennsylvania can strong hurricane-force winds occur, posing risks and causing damage. However, powerful tornadoes can sometimes strike. Pennsylvania averages up to six tornadoes per year, ranking 27th nationally for this metric.
Tornadoes are most common in June, followed by July and August. Areas with a higher concentration of tornadoes include the far northwest, the southwestern plateau, and the southeastern Piedmont.
Most tornadoes recorded in Pennsylvania have not caused significant destruction or severe consequences. However, the state is not immune to such events. The most devastating was the tornado outbreak of May 31, 1985, when 27 tornadoes swept through northern and western counties, killing over 60 people. In June 1944, three powerful tornadoes struck the southwestern part of the state, claiming 45 lives, injuring 362, and causing over $2 million in property damage.
Specific Climate Features of Philadelphia
Philadelphia shares some general climatic characteristics with Pennsylvania but also has its own distinct features. The city has a humid subtropical climate, characterized by hot and humid summers, mild autumns and springs, and fairly cold winters. However, seeing snow in the city isn’t a guarantee every winter season. Sometimes, only a light dusting occurs, while other years bring significant blizzards. Generally, Philadelphia rarely gets heavy snow. The most intense snowfall occurred in January 1996, when the snow depth reached 30.7 inches.
Average temperatures are not extreme, allowing residents and visitors to feel comfortable in any season. The highest temperature recorded was 106°F in August 1918. The lowest temperature in the city was -11°F in February 1934; since then, it has not dropped below 0°F.
Rainfall can occur in Philadelphia at any time of year, but there are typically no more than 12 rainy days per month. July 2013 was the wettest month, with Philadelphia International Airport recording 8.02 inches of precipitation.
Overall, Philadelphia’s climate is quite comfortable for living and generally predictable for its residents. Nature rarely delivers unpleasant surprises; instead, it helps people enjoy life in the city’s numerous parks and outdoor spaces. The city remains charming throughout every season.