Fill your tires with air when they're still cold/frozen. Before you drive it if possible or get it to the nearest air pump after it's been sitting all night. Fill them to the proper PSI then. Walla your light will remain off for the entire winter season.

Reason is cold air is denser than hot air. When tires are cold the air pressure drops by 1-3psi when tires aren't moving. When you start moving the tires heat up and the faster you drive the hotter they get, also if pavement is warm it'll heat up the tire faster (highways during the morning rush for example) that heat transfers to your air which makes it thiner and therefor expands back to the original psi and you regain your lost psi.

TPMS sensors have an allowance of -1 to +3 psi range before tripping the low air light. That's why when you fill them to the proper psi when tires are cold you'll have more play room with pressure fluctuation being that the positive pressure has less frequency of surpassing that +3 psi allowance.

 

My comment wasn't meant to insult the OP, but rather in response to the comment above mine - about charging a customer $10 for checking tire pressure. I suppose this is acceptable. In the old days they had full service gas stations where fuel cost more because one need not exit their vehicle to put gas in the car or check engine oil. Rather an attendant performed these tasks.

I have an acquaintance who couldn't be bothered to do anything beyond putting gas in the car. Tires get air whenever car gets an oil change which is whenever the light says so (some version of a bmw 328). This person is perfectly capable of performing these tasks but sees no reason to. The car is leased. I don't understand this logic, but then again I don't understand leasing a car either unless you're a business.