15度了。换胎吗?

In Ottawa, you should generally switch to winter tires when temperatures consistently drop below 7°C (45°F) and switch back to summer/all-season tires when temperatures consistently stay above 7°C (45°F).
 
换台季节从四月份开始,现在预约有点晚了但还赶的上
 
In Ottawa, you should generally switch to winter tires when temperatures consistently drop below 7°C (45°F) and switch back to summer/all-season tires when temperatures consistently stay above 7°C (45°F).
现在还不稳定。还会降温下雪
换四季胎胎的条件是七度以上七天。
 
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