my take is that if you're a beginner you dont really need to wait for the weather to start getting warm in the spring
the programme I quoted starts little, you are going to be out there ½ hour to begin with.
For the runs in Week 1, you will begin with a brisk 5-minute warm-up walk, then you will alternate 60 seconds of running, with 90 seconds of walking, for a total of 20 minutes.
so really you could do the same as me, I am literally just staying on Week 1 activity, I am not moving to Week 2 until I can handle the small amount of running described (which compared to couch potatoe is great of course) , for me this is all about getting off my butt in the winter
in the summer I have been cycling to work 6 miles but that needs daylight hours , I just cant be bothered to cycle in the dark, so this is what I'm doing in winter