Strange tyre wear

I'm not sure if this is a factor for you or not; I seem to add more air during the cold months than the warmer parts of the year. My tire pressure drops by 4-5 PSI every 2-3 weeks over the winter. and hardly at all during the summer. I ride year round and my tires never reach their end of life date before running out of miles. Keeping them filled up have increased that mileage by a 1,000 miles or so.
 
I think the cold air contacts in the cold and as the tire warms up it expands but i don't think the tire pressure gauges are completely accurate as the 3 i have all vary between 2 or 3 lbs when tested against each other so i do not think my tire pressures are exactly correct. I purchased a new gauge for comparison and that was different too.
 
Boog that tire is done bud
 
10 degress will change your psi from morning to morning, from 90 to 46 degrees f. Huge difference
 

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