Also, of course zombie fiction requires a major suspension of disbelief in this regard, but the damp/cold weather would cause the zombie bodies to freeze (at below zero) or decay faster (at above zero, though I suspect it is rarely if ever above zero)
To hide out from the zombie hordes behind an impenetrable wall of freezing air, you would just have to set up shop at some place like Amundsen Scott South Pole Station, Antarctica [3]. Once the jet fuel (what they use for power) runs out though, it will get unpleasantly cold, fast.
[1] http://www.usclimatedata.com/climate/whittier/alaska/united-...
[2] http://www.weatherbase.com/weather/weather.php3?s=46698
[3] http://www.foresthillweather.com/PHP/Metar2/AntarcticaAverag...
(Apologies to those who missed the first AvP movie.)
[1] http://www.alaska.org/weather/daylight-hours/whittier/june
[2] http://weatherspark.com/averages/33093/6/Whittier-Alaska-Uni...
http://reedyoung.com/project/whittier-alaska/r-young-whittie...
Not quite the same, I guess.
"Oh it's only accessible by water or the main tunnel, it's easy to secure" "oops we forgot about securing the old train tunnel" "oh no they're in the apartment building, let's go hide out in the creepy old abandoned building down the street"
... clearly I'm not going to be writing the screenplay, but the location has a lot of potential!