Why is it more windy at night?

It may seem that winds are stronger at night, but scientifically, days tend to be windier. Nights do seem windy to us because as the world (traffic, people, television, etc) quiets down around us, we begin to hear the wind more. So why are the days windier, then? One thing that causes wind is a pressure gradient, which exists when pressure changes more in one place than in another. This happens mostly in the daytime, when the sun is out and warming different areas differently. After the sun sets, there is less of a chance of such a temperature change. ==In more detail...== In more detailed terms: as a generalization, winds tend to be weakest near dawn and strongest in late afternoon because the colder the ground is, the more of a local inversion you’re likely to have isolating surface winds from the faster winds above (conversely in the late afternoon surface heating allows for more mixing with the faster moving winds above). Winds are not caused by pressure change but by pressure gradient — that is, differences in pressure across space. So heating or cooling can cause winds, but only by changing pressure in one place more than in another, so that a gradient is formed (or strengthened). ==Other causes for wind== There are other wind-causing factors too, however, and these can hit at any time — day or night. For example, winds associated with cyclonic and related frontal circulation are independent of diurnal (daytime/nighttime) factors — you’ll feel those the strongest whenever the associated circulation feature reaches you.

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