6x300m and 1x400m in terrible conditions

I did an evening workout in 32 F temperatures. It was so cold my fingers became numb and my legs felt tight. I ended up running 6x300m @ 47,46,46,46,43,42 seconds and finished with a 400m @ 61 seconds. I had a pretty easy weak of training so my I felt that I had some extra energy. I am sure I could run this workout much faster in warmer weather, a fast track, wearing spikes, and having some people to train with.