I always know is "in the morning" until I read this article "should I let my vehicle warm up on cold mornings?"

Why did it use "on cold mornings" instead of "in cold mornings" ? Is it because there is an adjective "old" before mornings then we use on instead of in? Does this rule apply to in the afternoon and in the evening too ?

  • 4
    Yes, the same rule applies, for example, to "on hot afternoons" and "on clear evenings", but I don't have an answer why. For what it's worth, it works the same with singular times: "on a hot afternoon" and "on a clear evening".
    – gotube
    Jan 10, 2022 at 6:02
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    There is also the usage of a morning meaning in the mornings which i think is possibly a dialect usage. I have no idea why we say any of these things though.
    – mdewey
    Jan 10, 2022 at 10:20

1 Answer 1


On is often used to reference days, or events that last less than a day, (On every Tuesday, on rare occasions, on a cold winter's night). Mornings, for example, only happen once a day. The sentence concerns the occurrence of specific thing - when it happens. It is not about the car being in the morning (that sounds silly). It is about what to do with your car when the cold morning occurs.

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