Lets see. I've never listened to all of them, so I think I'll do that now! I'll just comment on all them as I hear them.
12 AM: This one is okay. Atmospheric. Calm and soothing.
1 AM: I really love how soft and peaceful this one is.
2 AM: This one's meh for me. It really doesn't do a whole lot. Feels sleepy.
3 AM: I like this one. It's not as sleepy as the last hour. Has a bit of a held back bounciness to it.
4 AM: It feels like this music wants to be a little creepy or mysteriously airy like the nighttime theme of Hyrule Field in Twilight Princess. A little odd to me, since I think 1 or 2 would be better for this since the morning will be coming soon.
5 AM: I like this theme. It's really relaxing. I just hate the way it has the tropical instrument playing in it, feeling like I should be on the island instead of in my town.
6 AM: I'm not a fan of this one. It feels like another sleepy way early in the morning song. Maybe this should have been switched with 5 Am but that song felt like "good morning! Enjoy this pleasant tune!" and this one is more "the day is still sleeping. Have fun."
7 AM: This one's a good morning song. Still kind of slow but rather pretty and inviting. Something you'd sip coffee to and look out at the sun rising.
8 AM: This one isn't that bad. Get up and move music. But agh, those tropical steel drum sounds. |:
9 AM: I like this one too, but it really doesn't do a whole lot for me beyond play the main theme of New Leaf.
10 AM: This music's pretty silly! The bounciness of the notes is nice, but it still seems kinda sleepy for a song so late in the morning.
11 AM: This is what good morning music should sound like! Comfortable and wont rock you around while working but not sleepy to make you feel like crawling back into bed! How appropriate that it's the last morning song. xD
12 PM: This is a lovely afternoon song! A good introduction to the afternoon. Upbeat, let's get this day really moving!
1 PM: I'll never be able to like a 1PM song outside Population Growing.

They took away the cat song.
2 PM: Another sleepy song. Kinda odd to me.
3 PM: This is certainly the most unique song so far. I'm not sure what to call it, but it's not bad at all!
4 PM: I'm not sure I really like this one. It's... strange.
5 PM: This reminds me of Population Growing's soundtrack. I really, really like it. :3
6 PM: I like this. It sounds like a start to the evening song. Though the effects in it are a little odd to me. Since I don't know instruments and other musical things well, it's hard to explain.
7 PM: I really don't like how this song sounds. It makes a good sun going down song, but I just don't like it.
8 PM: This one is very nice for the time of day it's at. Calming and quite to help me settle into the nighttime.
9 PM: This one's not as good as the last one, but it's interesting for a night time theme. It sort of reminds me of the Goron City's theme in Ocarina of Time.
10 PM: This one is really weird. xD I'd expect an odd song like this to play in the wee hours of the morning! It's not a bad weird though.
11 PM: I really, REALLY, like how soothing and calming this is... I could easily fall asleep to this song. I think I found my favorite hourly song.