Ill jump in on this for what its worth- with those extreme conditions, i dont fee like you would be happy with a slick at all... when we ran ESRC rally events we used a special falken tire developed just for terrain and altitude changes of greater than 60deg... none were slicks. With those types of temp variances you will probably be better off running a tire like the R1Rs or the NT01 as another member suggested. These tires offer more grip than a summer street tire without the short life and needier driver input as the hoosiers.... as redTed said, a beginner should avoid slicks until car control is mastered...
Either way, its a learning experience..
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