My car won't crank at all when started. All electronics work fine and I checked the voltage to be a little over 12V.

Don't know if this influenced it in any way, but I accidentally left the trunk open all night and some rain might've gotten to the back.

Any thoughts, suggestions?

 

Have you checked under the spare tire and around battery for rain water?

 

There weren't any pools of water apparent. I had a jacket in the back and it was barely wet so the rain shouldn't have been too bad. I also tried my different keys...still no luck.

 

Try jump starting the car with another car. Due to the trunk being left open, battery may have been discharged.
12.6V -- 100% charge
12.4V -- 75% charge
12.2V -- 50% charge
12.0V -- 25% charge

If you don't have access to another car to jump start, charge the battery with trickle charger and try to start.

 

PCY is correct, 12v on a 12v battery is an empty battery, typically a good car battery will sit around the 12.5v 12.6v mark when off charge do you get a faint click sound? do the dash lights work, but when you go to turn over they turn off?

 

Just charge the battery or jump start as everyone has suggested. This happened to me before.