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diurnal - of or belonging to or active during the day; diurnal animals are active during the day; diurnal flowers are open during the day and closed at night; diurnal and nocturnal offices. 2. diurnal - having a daily cycle or occurring every day; diurnal rotation of the heavens.
Best Answer: 1. Diurnal (Daily) range of temperature The difference between the maximum and minimum temperatures of any one day, thus it calculated by: Maximum temperature â Minimum temperature --------------------------------------... 2.verage (mean) daily temperature This can be calculated in two ways:- a. The average of the maximum and minimum temperature over a period of 24 hours, so it is calculated by: (Maximum temperature + Minimum temperature)/2 b.