I ride through Death Valley in the winter almost every year. We're doing a run this year from Lone Pine, at the base of Mt. Whitney, through Death Valley and all the way down through the East Mojave, Joshua Tree to finish in Palm Desert. Death Valley is fantastic! Day time highs are usually in the low 60's with nights in the high 30's. Rain, of course, almost never falls, but it can get windy as hell, usually out of the north. The climbs in and out are pretty major. The easiest way out is via Death Valley Junction from Furnace Creek. This is a nice, moderate grade, excellent pavement, generally good shoulder, which gains over 3,000 ft. in about 20 miles. Coming in from the west is the toughest: Towne's Pass or Immigrant Pass. I've done Immigrant several times and doing Towne's from the west for the first time this year. Immigrant is wild, rarely traveled, snow and ice possible up high depending on the year/and time since recent storms. Rangers will have all the info. you need.
In short: Go do it!