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Why is it that cloudy nights are usually warmer than clear ones? Why does cloudy nights have higher temperature than clear nights? Do astronomers prefer the winter months to the summer months as there is more darkness?
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Why can you see the moon during clear nights? Who likes to lie under the stars on clear nights? What does clear moon frost soon mean? Study Guides. Trending Questions. Still have questions? Find more answers. Previously Viewed. These super-cooled temperatures can be up to 10 degrees cooler than feet above the surface, where observations are typically taken. For example, if conditions are favorable, air temperatures could be 36 F, but the air in contact with the surface could be 30 degrees or colder.
Cool temperatures, with some moisture, that promote ice crystal development. If the super-cooled, freezing temperatures can cool to the dew point the temperature at which, when cooled to at constant pressure, condensation occurs; moisture will have to come out of the atmosphere as fog, frost, etc frost could develop on exposed surfaces.
Local topography has a large role in determining if and where frost develops. Cold air will settle in the valleys since it is heavier than warm air, therefore frost conditions are more prone in these regions. Valleys also shelter the area from stronger winds, enhancing the potential for frost. If the temperature is below zero in the fog then it is called freezing fog, and forms rime ice as the fog touches surfaces, and this can be similar in appearance to hoar frost. You can find out more about different types of frost and ice here.
The two things are of course linked. During the day, the Sun puts energy into the ground, trees or your car and the ground then heats the air and temperatures rise. At night the same objects lose energy back into space, this cools the objects and then this cools the air. This is why temperatures usually drop overnight. The ground leads in both warming and cooling. Frosts are more common in winter because nights are longer, and the Sun is weaker, so there is more energy lost at night than there is going in during the day.
Wind speed is another important factor. This is why you usually find that in winter, cloudy and windy nights are usually mild and frost free, whereas clear and calm nights are usually cold, with the risk of frost. Commercial farmers often irrigate crops when frost is predicted. They are, in fact, artificially raising the dew point to decrease the likelihood of frost. There are ways we can minimize freeze and frost impacts in the garden. Siting is the first consideration. Gardens on slopes or high ground and southern exposures are less affected by frost and freeze.
Cold air is heavy and flows downhill to form "frost pockets" in low-lying areas such as valleys or hollows. These dates tell you when it is safe to begin planting, pruning and other activities. The dates are compiled by the National Climatic Data Center and are based on historical weather data from that area over a year period. Ann Auerbach is a Rutgers master gardener in Camden County. Send your lawn and garden questions to njgarden camdencounty.
A Rutgers master gardener will respond to all questions received. Master gardeners are there from 9 a.
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