I have been busy with calculating tire-pressure since 2007, with use of the formula the European tire- and car-manufacturers also use to determine the advice-pressures. Learned myself Excell to make spreadsheets for it.
The next spreadsheets could be of use in this topic.
In this map always take the newest version , and there are examples placed. It is for recalculating advice-pressures for non OEM tires.
This spreadsheet is to see what the temperature does to the pressures.
You can see it is an older one, because of the simpler excel layout.
The calculating of the advice is a simpler one then the first spreadsheet.
It wat an experiment for races where the temperature in the tire gets higher then normal. The calculations are correct, and the idea was to get the same pressure warm for races then the warm pressure for normal use. Mind that the tire-surface is warmer ( about 60d C normal) then the air in the tire ( about 45 d C normal, races about 90d C).
To answer your question. Lower pressure when it is cold outside gives more energy- production ,so the tires heat up quicker. The lower pressure at the colder outside temperature normalizes the loss of energy production when it is cold outside. You could calculate your own pressures and let the light be adjusted for normal use. Then you have to be ware of highening up the pressure when heavy loaded, that will be your responcibility.
So use your advice pressures and asume they are for 20degrees Celcius ( Fahrenheit ???) Then use the spreadsheet to see what the pressure has to be at 5 degrees Celcius for instance.
Then fill them at that pressure, so lower. Always fill cold, so before the ride and not after. Your own pump with manometer would be handy then. can also be one for race-bikes, they also work with high pressures, and you dont have to fill much.
When you garage your car you may put the pressure up to the maximum of the tires, to prevent square tires. Then there is a less flatter piece on the ground. dont forget to lower the pressure to the normal advice when you go using the car again. better would be to put them on blocks so the tires get of the ground.
I live in Holland so excuse me for mis-spellings
Hope this will be of any help.