How to dress by degrees in Manchester

Below 0 degrees : gloves, jeans, boots, t shirt , jumper , carry a jacket.
0-3 boots , jeans and maybe some thermals , long sleeve shirt and cardigan , jacket.
3-5 jeans , long sleeve shirt , jacket.
6-9 degrees : winter tights with skirt, t shirt , jacket.
10-13 degrees: skirt with tights , a t shirt and a light jacket for the wind
14-16 degrees : No need for tights. Shorts/skirt , t shit , carry a light cardigan for the wind.
17-20 degrees : skirt/shorts , t shirt , no need for cardigans and such because is so hot.