Correct Answer - Option 2 : dew point
Explanation
1. Dew point temperature is the temperature corresponding to the initiation of the condensation of the water particle. It is an indication of moisture content.
2. Mean of the temperatures observed at 24 equidistant times in the course of a continuous 24-hour period (normally the mean solar day from midnight to midnight according to the zonal time of the station).
3. A degree day is a measure of heating or cooling. Total degree days from an appropriate starting date are used to plan the planting of crops and management of pests and pest control timing.
It is a unit used to determine the heating requirements of buildings, representing a fall of one degree below a specified average outdoor temperature (usually 18°C or 65°F) for one day