Climate

Pennsylvania's diverse topography also produces a variety of climates. Straddling two major zones, the majority of the state, with the exception of the southeastern corner, has a humid continental climate. Greater Philadelphia has some characteristics of the humid subtropical climate that covers much of Delaware and Maryland to the south. Moving toward the mountainous interior of the state, the climate becomes markedly colder, the number of cloudy days increases, and winter snowfall amounts are greater. Western areas of the state, particularly cities near Lake Erie, can receive over 100 inches (254 cm) of snowfall annually, and the entire state receives plentiful precipitation throughout the year. The state may be subject to severe weather from spring through summer into fall, as an average of 10 tornadoes touch down each year in the state.

Monthly Normal High and Low Temperatures For Various Pennsylvania Cities in Fahrenheit
City	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Scranton	34/18	37/20	47/28	59/38	71/48	78/57	83/61	81/60	72/53	61/42	49/34	39/24
Erie	33/20	36/21	45/28	56/38	67/49	76/59	80/64	79/63	72/56	61/46	49/36	39/27
Pittsburgh	37/20	39/21	50/29	62/38	71/48	80/56	85/62	83/60	76/53	64/41	53/33	42/25
Harrisburg	38/23	41/25	51/33	63/42	73/51	81/61	86/66	84/64	76/57	64/45	53/36	42/28
Philadelphia	39/25	42/28	51/35	62/44	72/55	81/64	86/70	84/69	77/61	66/49	55/40	44/31
Allentown	35/19	39/21	49/29	60/38	71/48	79/58	84/63	82/61	74/53	63/41	51/33	40/24
East Stroudsburg	35/16	39/17	49/26	61/36	72/46	80/55	85/59	83/58	75/50	64/38	51/30	40/22
Philadelphia, Scranton, Harrisburg, Pittsburgh, Erie, Allentown, East Stroudsburg