I got 95 kW last week when there were two others charging around me and it was 55 degrees outside. But on Thursday, I was alone and got only 50 kW when it was 45 degrees. There seems to be no rhyme or reason with my experiences recently.
sb74, you didn't include any details about what state your battery was in each case, or how warm the battery was (or which battery it is), so it's hard to evaluate your experience. I'll just say:
There are a number of stars that need to align to receive 120kW when charging. They are:
1. You must not have anyone else on the other matched pedestal, i.e. if you are on 4b, 4a must be empty. This is because the 120kW is split between the two spots with a greater rate given to the first car to plug in.
2. Your battery must be near empty. How empty depends on which battery, generally that larger batteries charge at higher rates for longer. (there are some great charge rate graphs for all the batteries here on TMC) In an 85kWh battery, you will generally only see over 110kW rates when you are below about 25% full.
3. Your battery must be warm. Generally the battery will need to be above about 90 degrees F. This can take a LONG time when it's cool/cold out. After my car cold soaks below 32F I've found that it can take over an hour of driving to fully warm the battery up for a 120kW charge (this of course varies depending on car settings and type of driving). If a cold winter storm, I found it took over two hours of strait driving.
4. The SuperCharger must be at 100% health. This is the last item that is very hard to tell if it's met, because Tesla doesn't make public the % health of the chargers. The chargers fail gracefully, so it's quite possible to have a charge that should put out 120kW put out only 90kW or less when some of the internal modules have failed. In the past when 1-3 are met, and I see a very low rate, I've called the Supercharger number while charging and had them verify the charge that was taking place and made sure they had a ticket to repair it in their system. I'm not sure if they are still doing this now that there are so many chargers and they have just moved to an automated ticket generation system.
Peter