We will explain the phenomenon using the example of the sea breeze. The air, which warms up above the land, becomes light and rushes up, and cooler air from the sea immediately replaces it. This process lasts all day, as long as there is a stream of heated air over the coast. Such a breeze is called «Daytime breeze» and can be very calm: 1-5 meters per second.
In general, a breeze is a light wind, which appears due to temperature difference between two air masses.
Depending on the heating force, the land affects the circulation of the air flow. The more heating up of the land, the greater the temperature difference, the stronger the breeze is.
At night, temperature above the land may become cooler than above the water. Then the air flows change their direction and blow from the land towards the sea. This forms the night breeze.
Breezes appear in cities too. Their appearance is possible due to the heating of buildings by sunlight, which creates a difference in air temperature outside the city and in it. The difference can reach 8 degrees. This is enough for the cooled air to move from the suburban areas towards the city.
Depending on the layout of the streets, this process can cause an increase in the wind. Most often, the air flows through wider streets. In contrast to sea or forest breezes, city breeze moves around the clock.
The temperature of large forests during the day is lower than in the fields next to them. This is because most of the solar energy is spent on the evaporation of moisture from the leaves. Because of this, during the day, a gentle wind moves from the cold forest towards the field.