Planning for the weather is a good way to make your trip to Delaware Water Gap relaxing and enjoyable, especially when you’re splurging. The hottest months are usually July and August, with an average temperature of 20°C, while the coldest months are January and February, with an average of 0°C. The snowiest months in Delaware Water Gap are January, February, December and November, with each month seeing an average of 13 cm of snowfall.