Using the web dashboard there are multiple ways and time-periods you can select to view your measurement data. Depending on which time-frame you use the values you see will either be individual samples or averaged hours/days.
In my example below you can see there are 6 time-frame options:
custom date (you choose the dates)
When it comes to your radon sensor your averages will always be a rolling 24-hour average that is updated hourly. If you select: 12 hours, 48 hours, or 1 week you will see the rolling 24-hour, average on the chart as you hover the mouse over the line.
If you select the monthly view you will see that these averages will be expanded to a 4-hour average for every sensor on your monitor with these longer views averages come more into play and understanding the big picture when it comes to radon.
Now, for the other sensors depending on your monitor (temperature, humidity, VOCs, Co2, and air pressure) these are all updated every 5 minutes. If you select a 48-hour view or 12-hour view, you will be able to see every 5-minute measurement sample that is available for that sensor. However, if you extend the view to weekly, monthly, or a custom date it will give you the hourly, 4-hour average, 3-day averages.