Boston,locatedinthenortheasternUnitedStates,establishedin1630,isoneofthenation'soldestandmostculturalheritagesofcities.Thecity,covering48squaremiles,hadanestimatedpopulationof626,000in2011,makingitthe21stlargestcityintheUnitedStates.InthehistoryitwasthesceneofseveralkeyeventsoftheAmericanRevolution,suchastheBostonMassacre,theBostonTeaParty,theBattleofBunkerHillandtheSiegeofBoston.AfterthecomingofAmericanindependencethecitybecameanimportantportandmanufacturingcenter,andacenterofeducationandcultureaswell.Itsrichhistoryhelpsattractmanytouristsanditisconsideredtobeaglobalcityoracosmopolitancity.Bostonhasacontinentalclimatewithsomemaritimeinfluenceanditlieswithinthetransitionfromahumidsubtropicalclimatetoahumidcontinentalclimate.Summersaretypicallywarm,rainy,andhumid,whilewinteroscillatebetweenperiodsofcoldrainandsnow.Springandfallareusuallymild,withvaryingconditionsdependentonwinddirectionandjetstreampositioning.PrevailingwindpatternsthatblowoffshoreminimizetheinfluenceoftheAtlanticOcean.ThehottestmonthisJuly,withameantemperatureof23.0°C.ThecoldestmonthisJanuary,withameanof?1.7°C.Boston'scoastallocationontheNorthAtlanticmoderatesitstemperature,butmakesthecityverypronetoNor'easterweathersystemsthatcanproducemuchsnowandrain.Besides,fogisfairlycommon,particularlyinspringandearlysummer,andtheoccasionaltropicalstormorhurricanecanthreatentheregion,especiallyinearlyautumn.DuetoitssituationalongtheNorthAtlantic,thecityisoftensubjectedtoseabreezes,especiallyinthelatespring.
