Same for me. While in Japan, I was suffering in blizzards up North, though it was decidedly warmer this year then usual for January in Hokkaido.
I think I've written it before, but this is why the sealed bag is a good idea, not as bad an idea as some people would think... but there's points that should be remembered when doing so.
The first thing to understand is that the warmer the air is, the more moisture it is capable of holding... This is common knowledge for some people, but it's suprising how many people don't know this.
An example of this is: Air at 30*C at 80% humidity has more moisture content then air at 20*C at 80% humidity.
The next point is there are three very important temperatures that you should make the effort to know.
They are: Average Air Temp, Dew Point, and Surface Temperature.
The average Air temp is the one we all know and judge by. Dew Point is the temperature at which condensation forms on any surface that hits or goes below that temperature... Of course the surface temperature is the temperature of your camera and lenses... if this temperature is < or = to dew point, you'll get condensation.
There are instruments that will give you such readings... These are primarily used in scientific industries, aviation, and painting industries. They're usually not cheap, and for accuracy calibration is recommended, which also comes at a price.
For most purposes a whirling hygrometer will suffice, and is significantly cheaper then anything digital, though not as convenient.
There are a few things in humidity you can do to protect your gear, which is as follows:
Keep it above the highest dew point. Hard to do if you're working outside in the cold & Place it in a sealed plastic bag prior to going to warmer locations. It's important that you remove as much excess air as possible from the bag though, and it doesn't hurt to have a dry cloth inside the bag to capture moisture should it form. Once inside, warm it up slowly... All pretty standard stuff. Once it's at an acceptable temp, you can remove it safely.
BTW. some people get confused about dew point, and thing that it will always be 0... but it isn't. For example, 30*C @ 80% humidity (a humid tropical day) will have a dew point of 26*C approximately.
Don't know how much of that's useful, but some people might be interested. ^_~