Couple of our tires leaking down - Cold Weather

[LETMGROW]

Any tire will have a pressure loss when the temperature drops. However it will be pretty much the same in all tires. Not one, two or three. When the temperature rises the pressure will increase. Again all the tires should react pretty much the same.
What the OP is describing is an exceptional loss of pressure. The vehicle should be taken to a competent repair shop and be diagnosed and the problem corrected. It's like driving with a bomb attached to each wheel just waiting to go BOOM!
Lynn

[twinboat]

Dig into a few tire manufactures tire guides and you will find that they claim that up to, 2 psi per month is normal.

Don't flame me, look it up.