And, Joshua, it is unusual to find icebergs as far south as Titanic's position, then or now, but not unheard of obviously.
However, if the North Atlantic Current (Gulf Stream) slows or stops (God forbid, but it has in the past) then icebergs might become more common. The glaciers in Greenland, from where they come, are melting at the moment, and calving quite large icebergs as a result, but they still usually disappear north of the wreck site.
You might find this interesting.
http://news.independent.co.uk/environment/article330361.ece
zmag.org/content/showarticle.cfm?SectionID=57&ItemID=9208
Time to lag those pipes, check the roof insulation, and buy that thermal underwear. Or, perhaps, just move to Alaska instead, which, I've read, may paradoxically get much warmer.