Normal freezing and thawing degree-days from normal monthly temperatures

A method has been devised for using normal monthly mean temperatures to compute normal freezing and thawing degree- days in change-over months with adequate accuracy. The tedious calculation of daily departures from freezing for 30 years can, therefore, be avoided. The method has been applied to over 800 Canadian stations and the resulting freezing and thawing indices used to prepare the charts accompanying this note.Une m\ue9thode a \ue9t\ue9 \ue9tablie pour permettre le calcul, \ue0 partir des temp\ue9ratures moyennes mensuelles normales, des degr\ue9s jours de gel ou de d\ue9gel durant les mois de transition, avec une pr\ue9cision convenable. Le calcul fastidieux des occurences de d\ue9gel quotidiens sur une p\ue9riode de 30 ans peut donc \ueatre \ue9vit\ue9. La m\ue9thode a \ue9t\ue9 appliqu\ue9e \ue0 plus de 800 stations canadiennes et les indices de gel et d\ue9gel r\ue9 sultants ont servi \ue0 pr\ue9parer les graphiques inclus dans la pr\ue9sente note.Peer reviewed: YesNRC publication: Ye