Have your local or somewhere else's current weather conditions shown in your stream!
You'll need a Free API key from OpenWeather to use this (Registration needed).
Now go to your streaming software and add a Browser/Website Source with this URL:
With width set at px and height at px for compact view.
For shorter but wider view use wifth 900px and height 212px.
The OpenWeather's API this site uses doesn't keep the actual minimum temperature data of the day. Instead it changes the value to the minimum between the current hour and the end of the day.
This site only collects the minimum and maximum temperature once per day, so the later in the day you start using this site, the worse the effect explained above will be.
To circumvent this, you can simply show the next day's minimum. It shouldn't be a problem, right?