It wasn't clear from your initial comments whether you had hiked Mount Washington before. If you have not, you may not be as familiar with how different the weather can be on the summit. Just a tip to check
http://www.mountwashington.org within 24 hours of your trip. Go the the "Weather" tab and check "Higher Summits Forecast". For example, it says tomorrow will be in the upper 40s with winds of 15-30 mph. Good to know ahead of time so you can pack the appropriate gear. Enjoy and be safe.