I don't think he is a curmudgeon, I think he just likes challenging climatic conditions.
Chris Messina did such great work this year making a curmudgeon charming on The Mindy Project.
In person, Messina is a bit like Danny, minus the curmudgeon qualities.
1570s, of unknown origin; the suggestion, based on a misreading of a garbled note from Johnson, that it is from French coeur mechant "evil heart" is not taken seriously; the first syllable may be cur "dog." Liberman says the word "must have been borrowed from Gaelic (and references muigean "disagreeable person"), with variant spelling of intensive prefix ker-. Related: Curmudgeonly.