Without a doubt. The wet, slippery slabs just don't dry up in Maine. The woods tend to hold the moisture.
The ups in the Whites are tougher than many other places with lots of granite slabs which can be slick when wet.
There aren't any spots along the AT that you'll fall vertically off unless you want to. The closest I can think of is the Franconia ridgeline.
The wind can knock you flat anytime of the year. I've been up there in calm and 80 degrees and gale winds of 40 and up in 30 degree weather - both in July.
Tree cover for protection is never really that far away, though you can't camp in areas where the trees are 8ft. or less in height.
There are no tough stream crossings on the AT in the Whites - at least in less than tropical storm conditions, even then, I can't really think of anything north of the west side of Mt. Moosilauke (one crossing) and Beaver Brook (on the northeast side), which you usually hike beside unless it's in flood, then you hike IN it.
Above the treeline, the trail tends to be rocky, most especially from Lakes of the Clouds over Mt. Madison. The north side of Mt. Madison traditionally, is the windiest spot
on the AT in the Whites.
The climbs
down Madison and
up Wildcat are rough and slippery. Wildcat has a LOT of slabs.
Snakes? - No poisonous ones will be found in the Whites.
If it's sunny and you don't have a tan, slather on sunscreen and wear a broad brimmed hat (with a cord to hold it in the wind), or you will soon resemble a New England lobster dinner.
If you like tourists, and have some extra cash, stay at the huts. The food is good and you'll have to carry that much less weight.
If you don't want to blow a chunk of change for lodging, but want to be out of the weather, stay at the Randolph Mtn. Club's Grey Knob or Crag camp. There are some platforms near the Perch (a dog house of a shelter, really) if that's more your thing. You can hammock there, too.
When it's windy, watch your pack cover (tie it extra securely), and don't wear baggy wind or rainwear - it becomes a sail.
Vertical climbing is on south side of S. Kinsman Mountain and one spot on the Garfield Ridge Trail (AT) unless it's been rerouted.
In southern Maine, Mahoosuc Notch is interesting, cool in the summer, but overrated for difficulty (if you have a normal sized pack). The climb after the notch is tougher. Hall and Moody Mountains rate in my memory as the toughest climbs in southern Maine.
I don't want to give it all away (it's supposed to be an adventure, after all).