Английская Википедия:Climate of Pennsylvania
The climate of Pennsylvania is diverse due to the multitude of geographic features found within the state. Straddling two major climate zones, the southeastern corner of Pennsylvania has the warmest climate. A portion of Greater Philadelphia lies at the southernmost tip of the humid continental climate zone, with the city proper being in the humid subtropical climate zone. Still, Philadelphia features colder, snowier winters than most locations with a humid subtropical climate. Moving west toward the mountainous interior of the state, the climate becomes markedly colder, the number of cloudy days increases,[1] and winter snowfall amounts are greater.
Using the January freezing isotherm, the humid subtropical climate (Cfa) only exists in parts of Greater Philadelphia and low-lying areas of the lower Susquehanna Valley from Harrisburg downriver. Pennsylvania's hardiness zone ranges from 5a in high-elevation areas to 7b in parts of Delaware and Philadelphia Counties.
Precipitation
Western areas of the state, particularly cities near Lake Erie, can receive over Шаблон:Convert of snowfall annually, and the entire state receives an average of Шаблон:Convert of rainfall every year. Floods are more common in March and April than other months of the year. [2]
Tropical cyclones
Tropical cyclones normally threaten the states during the summer and fall, with their main impact being rainfall.Шаблон:Tropical Cyclone Rainfall in the Mid Atlantic United States Although Hurricane Agnes was barely a hurricane at landfall in Florida, its major impact was over the Mid-Atlantic region, where Agnes combined with a non-tropical low to produce widespread rains of Шаблон:Convert to Шаблон:Convert with local amounts up to Шаблон:Convert in western Schuylkill County in Pennsylvania.Шаблон:Tropical Cyclone Point Maxima These rains produced widespread severe flooding from Virginia northward to New York, with other flooding occurring over the western portions of the Carolinas.
Philadelphia has received sustained winds approaching hurricane-force from tropical cyclones in the past.[3]
Climate extremes
Temperature
The state record low is Шаблон:Convert, recorded at Smethport on January 5, 1904, while the state record high is Шаблон:Convert, recorded at Phoenixville on July 9 and 10, 1936.
Precipitation
Rain
| Event[4] | Measurement | Date | Location |
|---|---|---|---|
| Greatest 24-Hour Rainfall | Шаблон:Convert | June 22, 1972 (during Hurricane Agnes) |
York |
Note: While the official measured rainfall record is given above, the NCDC notes that an estimated Шаблон:Convert of rain fell in 12 hours near Smethport on July 17, 1942. The NCDC says this is "arguably the greatest 24-hour rainfall on record outside of the tropics".[4]
Snow
| Event[4][5] | Measurement | Date | Location |
|---|---|---|---|
| Greatest 24-hour snowfall | Шаблон:Convert | March 20, 1958 | Morgantown |
| Greatest two-day snowfall | Шаблон:Convert | December 24–26, 2017 | Erie |
| Greatest snow depth | Шаблон:Convert | March 22 & 23, 1958 | Gouldsboro |
Hurricanes
| Event[6] | Measurement | Date | Location |
|---|---|---|---|
| Wettest Tropical Cyclone | Шаблон:Convert | Agnes (1972) | Western Schuylkill County |
Climate statistics for selected cities
Шаблон:Allentown, Pennsylvania weatherbox Шаблон:Erie, Pennsylvania weatherbox Шаблон:Harrisburg, Pennsylvania weatherbox Шаблон:Philadelphia weatherbox Шаблон:Pittsburgh weatherbox Шаблон:Scranton–Wilkes-Barre, Pennsylvania weatherbox
See also
Notes
References
Шаблон:ClimateUS Шаблон:Authority control
- ↑ The Pennsylvania State Climatologist. Annual Average Number of Cloudy Days In Pennsylvania. Шаблон:Webarchive Retrieved on 2008-01-28.
- ↑ The Pennsylvania State Climatologist. Climate of Pennsylvania. Шаблон:Webarchive Retrieved on 2008-01-28.
- ↑ David M. Roth and Hugh D. Cobb III. RE-ANALYSIS OF THE GALE OF '78 - STORM 9 OF THE 1878 HURRICANE SEASON. Retrieved on 2008-03-05.
- ↑ 4,0 4,1 4,2 Шаблон:Cite web
- ↑ Шаблон:Cite news
- ↑ Шаблон:Cite web
