At what time during a 24-hour day would a radiation temperature inversion best be developed?

At what time during a 24-hour day would a radiation temperature inversion best be developed?
  a. at sunset
  b. near sunrise
  c. toward the end of the morning
  d. between 2 and 5 pm when the air temperature reaches a maximum

Suppose yesterday morning you noticed ice crystals (frost) on the grass, yet the reported
  minimum temperature was only 35o F. The most likely reason for this apparent discrepancy isthat:a.
 
   temperature readings are taken in instrument shelters more than 5 feet above the ground.
  b. the thermometer was in error.
  c. the newspaper reported the wrong temperature.
  d. the thermometer was read before the minimum temperature was reached for that day.
  e. the thermometer was read incorrectly.

In clear weather the air next to the ground is usually __________ than the air above during the
  night, and __________ than the air above during the day.
  a. colder, warmer
  b. colder, colder
  c. warmer, colder
  d. warmer, warmer

The lowest temperature is usually observed:a.
   at the time of sunset.
  b. near midnight.
  c. several hours before sunrise.
  d. around sunrise.
  e. several hours after sunrise

The greatest variation in daily temperature usually occurs:a.
   at the ground.
  b. about 5 feet above the ground.
  c. at the top of a high-rise apartment complex.
  d. at the level where thermals stop rising.

During the afternoon the greatest temperature difference between the surface air and the air
  several meters above occurs on a:
  a. clear, calm afternoon.
  b. clear, windy afternoon.
  c. cloudy, calm afternoon.
  d. cloudy, windy afternoon.

The strongest radiation inversions occur when:a.
   skies are overcast.
  b. skies are partly cloudy.
  c. skies are clear.
  d. precipitation is falling.