Coyote Chris
Site Supporter
I got the following from Subaru as far as how weather changes tire pressure.
A tire pressure gage, IIRC, compares ambient pressure with inside the tire pressure.
I personally havent done any tests on my NT to check the difference between a 32 degree morning and an 80 degree day.
"Here’s how hot summer roads can affect tire pressure.
It’s important to know how the hot summer weather can affect tire performance.
Heat increases tire inflation
Changes in outdoor temperature will likely affect your vehicle’s tire pressure. While a drop in temperature will certainly lower tire pressure, a rise in temperature will create more pressure. A good rule of thumb to remember is that, for every 10-degrees Fahrenheit increase in temperature, your tire’s pressure will go up roughly one pound per square inch (PSI). As you can imagine, this can really pose a threat to your tires when the temps skyrocket in the height of summer.
As if that’s not cause enough for concern, consider this: Regardless of outdoor temperature, tire pressure increases while you drive. In fact, within the first half-hour of driving, tire pressure can increase roughly 5 PSI. Combine this fact with the sweltering heat of summer and you could run the risk of driving on over-inflated tires.
Over-inflation’s effect on tires
The effect of over-inflated tires reaches beyond what you might think. When tires have too much pressure, they’re more susceptible to blowouts and overheating, and they can experience premature wear. Over-inflated tires also lend to decreased traction and subpar handling, so it can affect your vehicle’s safety, too.
What you can do
If you’re worried that your tires might be over-inflated from the heat, or that over-inflation has caused any damage or premature wear, fear not. There are steps you can take to avoid and manage over-inflated tires.
First, become familiar with what the recommended tire pressure is for your vehicle. You can find this information in the doorjamb, as well as in your vehicle’s Owner’s Manual. Aim to keep your tire pressure at this recommended level.
Next, it’s important to check your tire pressure regularly. Watch this quick video to learn how to check it yourself. Do it at least once a month—first thing in the morning, or after a few hours have passed since you last took your vehicle for a spin. Try to check all four tires at each fuel stop to help maintain fuel economy and tread life – especially if you’re taking a road trip.
(The following is kind of sad but I will include it as it is part of the article)
Finally, if you find that your tires are indeed over-inflated, bring your vehicle to us. Our Factory Trained Teams will inspect your tires and safely return them to the manufacturer’s recommended pressure level. If you happen to need new tires, we can handle that, too! Just don’t attempt to let air out of your tires on your own—you run the risk of under-inflating them, which can be just as dangerous as over-inflating them.
A tire pressure gage, IIRC, compares ambient pressure with inside the tire pressure.
I personally havent done any tests on my NT to check the difference between a 32 degree morning and an 80 degree day.
"Here’s how hot summer roads can affect tire pressure.
It’s important to know how the hot summer weather can affect tire performance.
Heat increases tire inflation
Changes in outdoor temperature will likely affect your vehicle’s tire pressure. While a drop in temperature will certainly lower tire pressure, a rise in temperature will create more pressure. A good rule of thumb to remember is that, for every 10-degrees Fahrenheit increase in temperature, your tire’s pressure will go up roughly one pound per square inch (PSI). As you can imagine, this can really pose a threat to your tires when the temps skyrocket in the height of summer.
As if that’s not cause enough for concern, consider this: Regardless of outdoor temperature, tire pressure increases while you drive. In fact, within the first half-hour of driving, tire pressure can increase roughly 5 PSI. Combine this fact with the sweltering heat of summer and you could run the risk of driving on over-inflated tires.
Over-inflation’s effect on tires
The effect of over-inflated tires reaches beyond what you might think. When tires have too much pressure, they’re more susceptible to blowouts and overheating, and they can experience premature wear. Over-inflated tires also lend to decreased traction and subpar handling, so it can affect your vehicle’s safety, too.
What you can do
If you’re worried that your tires might be over-inflated from the heat, or that over-inflation has caused any damage or premature wear, fear not. There are steps you can take to avoid and manage over-inflated tires.
First, become familiar with what the recommended tire pressure is for your vehicle. You can find this information in the doorjamb, as well as in your vehicle’s Owner’s Manual. Aim to keep your tire pressure at this recommended level.
Next, it’s important to check your tire pressure regularly. Watch this quick video to learn how to check it yourself. Do it at least once a month—first thing in the morning, or after a few hours have passed since you last took your vehicle for a spin. Try to check all four tires at each fuel stop to help maintain fuel economy and tread life – especially if you’re taking a road trip.
(The following is kind of sad but I will include it as it is part of the article)
Finally, if you find that your tires are indeed over-inflated, bring your vehicle to us. Our Factory Trained Teams will inspect your tires and safely return them to the manufacturer’s recommended pressure level. If you happen to need new tires, we can handle that, too! Just don’t attempt to let air out of your tires on your own—you run the risk of under-inflating them, which can be just as dangerous as over-inflating them.
