This is why gardeners will put water vapor in the
air and water liquid on the ground around their garden on a clear cold night — it protects the
local area from cooling as fast
because water vapor and liquid both 1) cool much slower than dry
air due to their massive heat capacity, and 2) cool even slower
because they release their massive latent heat, which means that heat energy is released from them without requiring a drop in
temperature — once they're in the latent heat release phase, they just keep shedding energy without dropping in
temperature any further.