Hourly, or more often, data is nice because it shows the lag between the peak outside temperature and peak inside temperature. It's good to do that once to get the lag.
Using the max/min function on digital thermometers tells you the peak temperatures, inside/outside temperature difference, and the temperature swing. That data is enough to compare windy vs calm, sunny vs cloudy, and the effects of improving air sealing and insulation. When using the max/min method, it is necessary to find a location for the outside thermometer that is always 100% shaded.
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