why is it it gets colder in the mornings after the sun rises than before, when it's still dark?

Answer 1

I use to work as an airport weather observer and had noticed that this occurs often. Based on my observations, this occurs most often when the enviroment is stable and/or the temperature drops down to or near the dew point. In other words, relative humidity is near 100 percent. In both cases, it is best that the surface winds are near calm at sunrise.

When the enviroment is stable at night, the coldest air sinks to the ground surface. An official temperature measuring device by international standard is about 4 to 6 feet above ground. (Some are even higher, like RAWS weather stations, are even much higher above the ground.)

So in a stable enviroment, the temperature below the height of where the official temperature sensor is located is usually cooler. When the sun comes up and starts heating the surface, this air starts to mix upward. As a result, the coldest temperature reading of the day will occur when this air mixes up to the height of the sensor. This usually occurs about 15 to 90 minutes after sunrise.

Also, when the RH is high, condensation that occurs overnight on the surface of the ground and the wooden box that holds the temperature sensor (also known as an instrument shelter). This condensation would evaporate with the heating of the morning sun. This evaporation process will briefly cool the air near the sensor until the surface dries.

So either or can happen. So if these conditions exist, I would expect the temperature sensor will measure the coolest temperature within the first 90 minutes after sunrise.

Answer 2

The coldest temperatures are usually two or three minutes after sunrise. The Earth receives radiation from the Sun during the day and heats up. The Earth radiates heat out into space.

If you graph the incoming solar radiation you will find that it starts at sunrise at zero, reaches a maximum at local noon and ends at zero again at sunset.

If you graph the outgoing radiation from the Earth you will find that it increases during the day - it is hotter and therefore radiates more - and decreases at night. Even though the amount of radiation decreases, it is never zero, the Earth is always radiating out into space.

If you now place one graph over the other you will see that they cross twice. Obviously if there is no solar radiation at night, there is more heat being lost than being gained. The first crossing point is about 3-4pm. At that time the incoming solar radiation exactly matches the outgoing terrestrial radiation. After that time more heat is being lost. This crossing point is usually the time of the maximum temperature for the day.

The second crossing point is just after sunrise. The sun is up and heating the ground but it takes a little time for the incoming radiation to match the outgoing radiation. This happens a few minutes after sunrise and is usually the time of the minimum temperature for the day.

Answer 3

Dew starts forming as quickly because of the fact the temperature drops - which it does as quickly because of the fact the solar starts happening. So, yeah, the garments gets damp. the approach will strengthen over the direction of the night and in one day, because of the fact the temperature drops to its lowest element - besides the undeniable fact that it fairly is all area of a continuum. And in spite of if or not you're attentive to it, there is often some moisture interior the air. As to the source - it fairly is person-friendly technology. the technique of the air to hold moisture correlates to temperature. heat air is able to hold greater moisture than chillier air. it fairly is why there is dew on the grass interior the morning...besides the undeniable fact that it fairly is all area of a technique. purely considering which you purely see the outcomes interior the morning, would not advise it is not happening beginning up interior the night and in the process the night.

Answer 4

it may be your perception that is not right because you expect the sun rising bringing you more heat...seeing the sun and not feeling its heat right away probably makes it feel colder even if it is not