I live in the D.C. area and am using a Fujitsu laptop 40gig drive and Xenarc 8" screen. The drive survived last summer and this winter. It froze once because the laptop drives use fluid bearings and it was single digits one day last winter. After 10 minutes it had warmed up and the drive started working. It was okay down to 15F.
Can't speak for the screen because I've only had it since January. The old screen died during the winter but it was neither a Xenarc or a Lilliput and was not a poster boy for quality anyhow.