Register and create Dark Sky Account developer account
2. Secret Key
After email verification, log in and copy secret key for Dark Sky API
3. Create New Integration
Admin > Sysadmin Control Panel > API keys
click add new integration and create the following API key as required
API name: dark_sky
API description: Dark Sky Weather API
API help: Allows the weather component to connect to the Dark Sky API
Paste secret key to the entry value.
4. How to test ?
If you have weather component installed, then from any Pages you should be able to add new weather