My weather algorithm needs work

Where I grew up in Florida, weather was simple.  It was hot, or it was too damn hot.  It was raining, or it wasn't.  That's it.  Sure, a few times in my life a hurricane trashed us, and once a June storm caused flooding, but those events were more like visits from political candidates than regular weather:  Everyone talked about them, and you had plenty of warning they were coming.  I consequently grew up with a simple approach to the weather:  It was what it was, and it didn't matter to me.

I've now lived far more of my life outside Florida than in it, but my fundamentally blase attitude about the weather has stayed with me.  I've sharpened my weather-planning algorithm only slightly:  In spring, I switch to short-sleeve shirts; in summer to shorts; in fall back to long pants, and in late fall to long-sleeve shirts.  When it starts getting cold, I add a light coat when I notice people around me wearing one.

This approach generally works for me in my part of North Carolina.

Today, it did not. 

I'd upgraded to a coat a bit ago, when the weather turned cold, and I knew it was December, so I figured I was done thinking about the weather until March.  I'd noticed over the past few days that the coat was a bit much, but I figured that situation would correct itself soon enough.  In case I was wrong, though, I left the coat on the hanger this morning and wore a heavy long-sleeved shirt.

Bad choice.

Today, the high was something like 77.  The day was glorious, the weather the perfection of a late September or early October afternoon.  I should have been in short sleeves.  Everyone else was. 

I definitely need to improve my weather algorithm.  The problem is, I can't be bothered.  Doing that would just add overhead to my day. 

Yes, I know I could look at the weather app on my phone, and I do that every now and then--but only when I've dressed inappropriately.  I could check it before dressing, but I won't, because, well, I'm stupid that way. 

Maybe I'll just leave a coat in every car we own and at my office.  That would cost more, but only once.

See?  I told you I'm stupid that way.