What are some options for reducing outside noise in a bedroom?

I currently live in a house at an controlled intersection across from a bar. During the summer the A/C drowns out the noise, and during the winter the cold and snow keep the noise down. However, it is crazy annoying during the rest of the year. I’m not moving out until June, but the noise has been an issue lately.

Does anyone have suggestions for ways to reduce the outside noise? I’m assuming it’s coming in mostly from the windows (yes, closed), but can’t rule anything. The house is 130 years old and drafty, so I can’t imagine the walls are bastions of sound reduction. I want something temporary, like sound-blocking drapes or something I can take with me when I leave (or dismantle).

And yes, I’m using a white noise machine already, and ear plugs aren’t an option.