Late April afternoon, Denver

The snow melts soon as it hits, 34℉. 

And that means soon as the sun disappears within minutes the temperature drops to freezing and traction goes with it. Especially wet overpasses with cold air flowing beneath them. It is particularly dangerous driving situation. 

April 16, 2016, Denver, 2:30 PM

It's the perfect time to head out and do things. Hardly anything is moving. Everybody is saying, "Eh, all we have to do is wait awhile and it will be clear again." And it's all clear streets and available parking. It's a pleasant April storm.