Weather station module and controller mode of operations

Hello, I am interested in the mentioned product but I do not have clear information on how the weather shield operates. as per the presented example some of the values are the "average" of the measured variable over some time 5mins or 1 hour, furthermore the unit outputs UART data each 1sec, but what will this data represent? if the unit output values per second are the average, so how does this average gets computed, is it a moving average ? does the module include a real time clock and a crystal? and what happens on first run, how will it output average data of 5 mins if the the required time interval did not pass yet

how accurate and reliable is the output data over given time intervals?

Thank you and much appreciated
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