Weather station

Weather station is a Davis Vantage Vue see detail about their products at link : http://www.davisnet.com/weather/ ( It has a sensor suite which is essentially the outside part and contains sensors for measurement of temperature, wind, humidity, rain, barometric pressure etc.

Then there is an inside console that has a wireless connection to the sensor suite and here one can see all the measured as well as calculated parameters e.g. temperature inside and outside, humidity inside and outside, dew point, cloud base, sunrise/sunset, daily/weekly/monthly/yearly rain, moon phases etc. etc.
A data logger is connected to the console and this in turn connects to a device called meteobridge which in turn wirelessly connects to the internet (can also be done via ethernet cable)

So even when the power is down the historical data logged by the console can be recovered (up to a couple of days depending on your station settings for the data logging interval)

See link : http://meteobridge.com for details.