Large Outdoor Displays

Good afternoon.

I am looking for a way to display the Current Heat Index (calculation of Temperature and Humidity) on a large outdoor display such as the one in the picture. The picture is just for reference as I am not sure what kind of display I should be using. It's dimensions are approximately 8.5" tall by 21.5" wide

I am not even sure what to search for when googling for this project. If somebody could help to point me in the general direction I would be grateful. I have purchased an Uno board to start off, but If I need to move to a different product I can easily. Thanks in advance.

HERE Here is an example: https://www.sparkfun.com/products/8530 Maybe: http://www.aliexpress.com/w/wholesale-large-7-segment-led-display.html