Is there any measurement in early morning

 Generally lowest or minimum temperature of a day is measured  or recorded just before the sun rise in early morning. As the sunrise , sun rays starts coming on to the Earth's surface and the earth's temperature  starts increasing.

The maximum temperature of a day  is generally measured or recorded about 3 p.m.Because sunrays obliquely falls on the earth after 3.00pm and temperature starts falling or decreasing.