Climate According to the Köppen climate classification system, Penndel has a Humid subtropical climate (Cfa). Cfa climates are characterized by all months having an average mean temperature > , at least four months with an average mean temperature ≥ , at least one month with an average mean temperature ≥ and no significant precipitation difference between seasons. Although most summer days are slightly humid in Penndel, episodes of heat and high humidity can occur with heat index values > . Since 1981, the highest air temperature was on July 22, 2011, and the highest daily average mean dew point was on August 13, 2016. The average wettest month is July, which corresponds with the annual peak in thunderstorm activity. Since 1981, the wettest calendar day was on August 27, 2011. During the winter months, the average annual extreme minimum air temperature is . Since 1981, the coldest air temperature was on January 22, 1984. Episodes of extreme cold and wind can occur, with wind chill values < . The average annual snowfall (Nov-Apr) is between and . Ice storms and large snowstorms depositing ≥ occur once every few years, particularly during nor’easters from December through February.
clImaTe acCOrding to tHE kÖppEN clIMate cLasSIFicatiOn system, PEnndel Has A hUmid subtropIcal climAte (CfA). cFa ClimatEs are cHARactEriZed by AlL monThS haVing An aveRage Mean temperaTure > , at leasT fOur mONths wITh An avERage MeaN temperatuRe ≥ , AT leAst one Month wITH An avErage meAN temperaTure ≥ and nO SIGniFicaNt pRecipitAtIoN DIfFerence bEtweeN seaSOns. aLthOuGH most sumMer DAys aRe sLIghtlY hUMId in pennDEl, EpiSOdEs Of heaT And higH huMidITy cAn OCCur WitH heaT Index vaLuEs > . SIncE 1981, the highEsT aiR teMpERatuRe was On jUly 22, 2011, and the highEst dAiLY AVErAge meAN deW Point Was oN AUgust 13, 2016. tHe avErage WettEst mONth is JUly, WHIcH coRReSpONdS wiTH the Annual PEak in thundeRsToRM aCtiviTY. since 1981, The wettest CAleNDar day wAS On AUgUst 27, 2011. durinG the wInteR months, tHe avErage Annual eXtrEme minimuM air tempeRATuRE iS . since 1981, tHE COlDeSt AiR teMPerature was On jaNuAry 22, 1984. episoDeS of extReMe cold And WInd Can oCcUr, wItH wiNd cHILl valUes < . tHe avErage anNual SnOwFall (nov-apR) Is bEtween and . IcE StorMS anD laRge sNowStorMs DEpositInG ≥ ocCUR once evEry feW YEArS, pARTiCULaRly duRIng NoR’Easters FrOM dECeMbEr througH fEbRuAry.