Why is there water and ice on my windows?

I am getting a lot of questions about the amount of water, and sometimes ice, forming on the inside of windows. With the winter temperatures plummeting to the lowest of the season, this is going to happen and there is something you can do to help.
Normally, I am telling you to increase the humidity levels in your home, which have become low because of your winter heating. Well, at this time, it is important to reduce your humidity level in order to reduce the amount of condensation on your windows. This humidity level chart will help you to determine the best home humidity level.
What happens is the cold outside air is trying to freeze your house fromIce on windows the outside in. The colder the air is outside the further the cold makes it into your home. This makes the due point, the place where water wants to condensate, close to the inside of your home. This causes an excess of condensation, and maybe a little ice on those single pane window. So, during these cold times, you may have to turn the humidity down to reduce the window condensation.

Ice on windows
With the cold weather this page has become a very popular page lately. The problem with ice on windows seems to be a one that many people are having. I wanted to add a side note about double pane windows vs single pane windows. Single pane windows will be more susceptible to the ice on window problem. This is because of the lack of insulating value that single pane windows have. If you windows become colder than 32deg (typically near the bottom) and your humidity level is high enough for condensation to happen, you will get ice on lower section of your windows.
Single pane windows
We live in an older house that has single pane windows and when it gets very cold we notice that the windows get ice on them.