I don't think it's safe for you to run outside as it might be slippery and u might get hurt. So I think you must do your speed test indoors on a treadmill. Doesn't matter whether it's less snow or more, it's always difficult to walk on some let alone run. So I'm myself a runner and I know it can be a bitch sometimes but you can always go to the gym. There sure is a lot of difference running outside and running on a treadmill but it's the only best option. Safe running brother.