Recently, Microsoft pushed a new update for the Tetra Lockscreen users, Now just not only covers features like daily agenda, Calendar events, whether, stopwatch it now has been integrated with Live Weather Feed too.
The updated brings a lot of bug fixes and the following change log:
Weather BETA
- Displays local weather information basis your location
- 3 day forecast on a swipe
- You can click on the city name to access MSN Weather
Bing Map background
- Select Bing Map and press apply for a daily rotating image
Minor bug fixes
- 4 appointments visible on calendar
- Now shows Facebook Birthday synced with your calendar
- Show Meetings sync over EverNote, Mail client etc
Download Tetra Lockscreen for Windows Phone, unfortunately the lockscreen is only available for US region however you can change the region to US to download this Lockscreen.