When you need to replace your windows, you should do it as soon as possible, but if it is possible for you to wait, there is an ideal time of year to replace your windows.
The most ideal time to replace your windows is through the warm and dry summer months. This is the ideal time as the weather will be on your side. When your windows are being replaced you will have a time where there is a hole in your property letting in the weather from outside. If you have these replaced during the wet months, rain and coldness will enter your home. There are ways to prevent this, but if you want to smoothest window replacement the warmer months are ideal.
Of course, if your windows desperately need replacing, do not wait until the ideal month. Have them replaced as soon as possible to keep your home protected and secure.