Il clima di St.Louis

Josh · 22/06/2011, 15:47

Leggevo le previsioni del tempo per questa città del Missouri:
Previsioni Meteo St. Louis - Louisiana - Yahoo! Meteo IT
Ha un clima che mi riesce difficile catalogare:si direbbe subtropicale ma con inverno non freddissimo nel complesso,eppure con periodi rigidi e persino nevosi.Molto "made in USA" nei suoi eccessi.E poi persino nebbioso nel semestre freddo...

Josh · 22/06/2011, 15:51

Diciamo che non si fanno mancare nulla:
"St. Louis lies in the transitional zone between the humid continental climate type and the humid subtropical climate type (Köppen Dfa and Cfa, respecively), with neither large mountains nor large bodies of water to moderate its temperature. It is subject to both cold Arctic air and hot, humid tropical air from the Gulf of Mexico. The city has four distinct seasons. Spring is the wettest season and produces severe weather ranging from tornadoes to winter storms. Summers are hot and humid, and the humidity often makes the heat index rise to temperatures feeling well above 100 °F (38 °C). Fall is mild with lower humidity and can produce intermittent bouts of heavy rainfall with the first snow flurries usually forming in early or mid November. Winters are often cold and snowy with temperatures frequently below freezing. Winter storm systems, such as Alberta Clippers and Panhandle hooks, can bring days of heavy freezing rain, ice pellets, and snowfall.

The average annual temperature for the years 1970–2000, recorded at nearby Lambert-Saint Louis International Airport, is 56.3 °F (13.5 °C), and average precipitation is 38.9 inches (990 mm). The normal high temperature in July is 90 °F (32 °C), and the normal low temperature in January is 21 °F (−6 °C), although this varies from year to year. Both 100 °F (37.8 °C) and 0 °F (−17.8 °C) temperatures can be seen on an average 2 or 3 days per year. The official record low is −22 °F (−30 °C) on January 5, 1884, although there were unofficial readings of −23 °F (−31 °C) on January 29, 1873 and −25 °F (−32 °C) on January 1, 1864; and the records high is 115 °F (46 °C) on July 14, 1954.^[21]
Winter (December through February) is the driest season, with an average 7.3 inches (185 mm) of precipitation. The average seasonal snowfall of 22.2 inches (56 cm). Spring (March through May), is typically the wettest season, with 11.4 inches (290 mm) of precipitation. Dry spells lasting one to two weeks are common during the growing seasons.
St. Louis experiences thunderstorms 48 days a year on average.^[22] Especially in the spring, these storms can often be severe, with high winds, large hail and tornadoes. St. Louis has been affected on more than one occasion by particularly damaging tornadoes.
Some late autumns feature the warm weather known as Indian summer; some years see roses in bloom as late as early December".