what relationship would you expect to find between the air temperature and dew point temperature at ground lev

Question

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Answer 1

Dew Point is the temperature at which condensation begins. (when relative humidity reaches 100%)
The ability of air to hold water vapor varies with temperature. It is much higher at high temperatures, (summer like), than when it is cold.
For a given amount of water vapor this means that there is only one dew point temperature.
During the warm months, when capacity is high, a 50% relative humidity represents a much greater amount of dissolved water vapor than during the cold months when the capacity is much lower.
As a result, given the same RH value of 50%, the DP in the warm months will be much higher, (because of the extra water vapor), than the DP during the cold months, (because of the smaller amount of water vapor needed to produce 50% RH at the lower capacity of cold air)

RH is the ratio of water vapor actually in the air divided by the capacity of the air to hold water vapor

Answer 2

Air temperature with 100 percent Relative humidity becomes the dewpoint temperature.Fog may form if this happens at ground level.