Thanks for the advice for that guys. I am finding that a lot of mornings I am already feeling slightly on the warm side when I get there, so suspect if anything my core temperature would rise if I continued to ride for any length of time, especially in the upper 40's afternoons. I have discussed this with my parents and agreed on just wearing the hoodie, along with the light raincoat for the wetter mornings. Should I still be wearing waterproofs in drizzle light rain? I find a hoodie doesn't tend to soak through in the 7-8 minutes of the misty, drizzly type if I'm out in it. I save waterproof trousers for exceptionally wet days. If it's showers (which are heavier than steady rain), I tend to dodge the drops as much as possible. I do also check the weather forecast every day. As for breaking, down 1.5 miles can be walked in 20-25 minutes and beng a fast walker, I can work up a decent heat walking dressed as detailed. If I'm cold walking, I don't walk, I run. I then repair the bike when I get home.
For more than 55 degrees, I feel hot to the point of dizziness if I'm expected to ride wearing anything more than shorts and t shirt for anything length of time, especially if it is humid. Hence why I will ride in shorts and a hoodie when the high is over 55, so I stay warm on the cooler 40-45 degree morning and also have that extra layer to wear in class. I still keep taking the sweatshirt all summer because I might need it in the air con, but I refuse to actually cycle with it on for anything over 50 degrees.
As for the longer rides, I do take extra layers in case of breakdown, normally a wool sweater and a fleece or hoodie. On warmer days, I would carry just one of these. I also carry waterproof coat and trousers even on warm days because if I break down and it's raining it won't feel so warm. In anything under 40, I wear gore-tex as a second layer, so rain isn't a problem. If it's 40-55 and raining, I will also wear the gore-tex, trying to vent as much as possible. Above 55 with rain, I just let my shorts and t shirt get wet. It keeps me cool, and smells a lot nicer than sweat, as well as not getting me dehydrated and/or leeching the body of essential minerals.
Will the shorts/ hoodie combo do me for just riding to school, during the spring/ early summer? Temps where I live:
March: High=52, Low=39
April: High=56, Low=42
May: High=63, Low=48.
June: High=67, Low=52 (yes we do get cool summers where I live)
By the time I ride in, it is usually above the "low"