Most windows will have some condensation on the bottom edge of glass sometime during the winter. High performance windows, with energy efficient glazing and warm edge spacers, will reduce the amount and frequency of occurrence by raising the inside glass temperature. A double glazed low-e, argon filled, unit with a warm edge spacer could be 5┬░C warmer than a standard unit.
The chart shows humidity levels that will likely produce unwanted condensation for standard windows and for high performance windows at various temperatures.
