21.   Carbon dioxide, the main greenhouse gas, and other pollutants trap solar radiation, thereby raising air temperatures and producing more water vapors.

22.   Clouds emit abundant infrared energy, which, in turn, is absorbed by the ground, thus buoying overlying air temperatures.

23.   -Cloudy skies may make the air temperature cooler, but UV rays are still coming through the clouds.

24.   Conversely it senses when the air temperature in the furnace drops below a comfortable level and it shuts the blower off.

25.   Depending on air temperature, the ratio between snow and its melted liquid equivalence can vary considerably.

26.   Frost can form on grass even though official air temperatures remain above freezing.

27.   Frigid air temperatures, especially during the spring spawning period, have more impact above the water line than below.

28.   How that translated into changes in the air temperature is unclear.

29.   HSI considers the current surface air temperature along with the relative humidity.

30.   If the air temperature and dew point are below freezing, frost may form on the surface, or ice crystals may form in the air.