Good answers.
I have run across bees that were black.. black.. completely black, and they were the meanest things I have ever had to deal with... Yours don't sound anywhere near as bad..
The ones I dealt with were stinging people three blocks away.. town blocks, not city blocks.. The first hive I tried to fuss with, and paid the price dearly. the second call I got was not long after, and I didn't even try to save them. I got stung getting out of my truck.. OOP! Back in the truck, put coat and veil on, THEN get out of the truck.. They had a layer of bees on the veil before I got to the hive.. I KNOW we don't have AHB up here, but can only imagine this is what they would act like.
Yours just sound like they were riled up a bit. Weather? As already mentioned, something disturbing them? Skunks or coon? Neighbors kids? A branch rubbing the hive? Could be a lot of things.
It's early yet, so you have time. If they continue to be more aggressive than you like as spring progresses, then definitely re queen them. They should make a great start for a new queen, and in a few weeks will be converted to the genetics of the new queen.