I am trying to find weather conditions, and I think this Mount Washington Observatory may be somewhat higher altitude: https://www.mountwashington.org/experience-the-weather/mount-washington-weather.aspx
Temperature change with elevation: http://www.onthesnow.com/news/a/15157/ask-a-weatherman--how-does-elevation-affect-temperature-
Not seeing a lot of snow, where we are going, based on doing a search for “New Hampshire” on this site the says it has relatively live satellite photos (Landsat Live):
Found site linked from http://www.citylab.com/design/2015/03/roam-the-earth-in-real-time/388252/
This site says that the weather station is NHFN1: http://www.weatherforyou.com/reports/index.php?pands=franconia+notch+state+park%2Cnew+hampshire
On the following map, you can turn on “Terrain” by hovering over “Map”: https://mesonet.agron.iastate.edu/sites/site.php?station=NHFN1&network=NH_RWIS
There I see, that the first hut is about 1000 feet above the station, or 3.3 degrees F cooler.
I later learned that the following app, if you put in the longitude and latitude coordinates, gives you the weather forecast at that very location, including altitude. Pretty awesome. https://play.google.com/store/apps/details?id=com.nstudio.weatherhere.free
Mosquitoes won't be as bad as later in the summer, but I think they are out already in late May. They don't bite below 50 degrees, or so I read at one site.
Black Flies we should worry about, according to Whiteblaze and Farmers Almanac. I'm going to see if I have a head net, just in case.
I'll be using clothes I've treated with permethrin.
Post backpack report (May 28-29-30): Nothing bit us. Didn't see any mosquitoes or flies!
There are tons of packing list suggestions on the net, just go out and look at a few, and decide what you want to take. Less is more. I include here a clothing list, because I wanted to stress to my friends that it's not worth taking along a change of clothes while you are out in the wilderness.
I'll be bringing a very light sleeping bag, and will just wear more clothes to sleep if I am cold. So if you have 35F rated sleeping bag, and the temperatures don't get into the mid 40's, you may not have to bring as many clothes (skip gloves, balaclava, etc). The reason you would use a 35F bag for a 45F temperature, is that sleeping bag ratings are usually false, and you have to add 10 degrees to know what you actually need. Actually, you end up having to test the bag for yourself.