Calculate That Wind Chill

The calculator part works ok, but the developer has not added any way to input negative temperatures using the built in keyboard, which is kind of something that comes up a lot when thinking about wind chill. I had to copy and paste my -16 degrees from notepad to figure out its going to feel like -40 on Monday. For people who live places where windchill is a normal thing to think about, negative temperatures are a frequent part of life.

Good App but should be able to input minus temps for those of us who live in cold climates

The green color of the wind chill number is very difficult to see. Please change the contrast.