If you have not done so already, go to WeatherUnderground.com and create a free account:

https://www.wunderground.com/signup

Login to your WeatherUndeground.com account and select My Profile and My Weather Stations to view your station ID and key.

If you have not created a weather station, go to:

https://www.wunderground.com/personal-weather-station/mypws

and select Add a New PWS button.

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