1 W/(m.K) = 1 W/(m.oC) = 0.85984 kcal/(hr.m.oC) = 0.5779 Btu/(ft.hr.oF)
Air, atmosphere (gas) 0.024
Pyrex glass 1.005
Ice (0oC, 32oF) 2.18
Snow (temp < 0oC) 0.05 - 0.25
Iron, cast 55
Stainless Steel 16
Just for fun, let me throw some numbers for thermal conductivity into the mix.
I dont know about air, but for water the inside vs outside temp is a few tenths of a degree F. Thats for a water bath with frozen bottles cooling a glass fermentor.
If you figure the difference in conductivity is x24, then 8-10 F corresponds to .33 -.40 in water, compared to air.