Using the free 'Weather Underground' provider needs a free developer key - you can get one by signing up for a free account and a free developer key at https://www.wunderground.com/weather/api

1. Click on 'Sign Up for FREE!'

2. Enter email, password, any other details and click 'Sign Up'.

3. Check your email and click the link in the confirmation e-mail to confirm your account.

4. Login using your email and password.

5. Click 'Explore My Options'.

6. Select the 'Stratus' plan and tap the 'Purchase Key' button (this is free, your charge will be $0)

7. Enter your name and e-mail address. Put 'WatchMaker' for the project name and website. Check 'Mobile', 'No', 'No', agree the conditions and tap the 'Purchase Key' button.

6. Copy the personal key and paste it when selecting Weather Underground in WatchMaker settings.

7. That's all! Now Watchmaker will use your personal key to access data.