I have started running and have asthma; will the colder weather start effecting this?

For some people it will, some people it won't. Humidity tends to be a common concern.

As long as your asthma is controlled, you should be alright as long as you take proper precautions. If you have been prescribed an emergency inhaler, stick it in a pocket just in case. Also, Linz is right about it being helpful to use it beforehand.

If you haven't been into exercise for a while, it won't be abnormal if you experience a lot of heavy breathing, etc. However, you'll get used to it and become more comfortable -- asthma is difficult but not unmanageable for athletes. I have two friends (brothers) who both have asthma and run marathons.

Edit: I left shortly after answering but while I was out I saw someone running and thought of a couple other things I'd like to add:

First of all, warm up. Do some stretches, etc., before you run. This will warm up your muscles and can help to brace you against the cold, and while it will not directly affect your resistance to your asthma symptoms, it will help you get "ready" to run and put less strain on your body and muscles. Too much strain can cause you to work harder and therefore, it can give you a higher heart rate and more labored breathing. So, because it helps to warm up your body, stretching and such for a few minutes before you run may make a difference for you.

Second, be careful with your pace. Some people run by just running -- same pace through the whole run, etc. Others make it more complicated by walking for a certain distance / amount of them, then running a certain distance / amount of time, etc., and while this can be effective for overall fitness, I don't recommend it as a method for you. Definitely walk occasionally if you need to, but don't walk at a slow pace for thirty seconds, then take off in a sprint. That kind of jolt in the amount of effort your body is doing will spike your heart rate quite a bit, as well as your breathing -- it prevents you from reaching a comfortable pace. Pick a pace you're comfortable with, and of course you can walk if you need to -- but don't take off in a sprint until you're more used to running and know how your asthma -- as well as the weather -- will affect you.

Last but not least -- this is unrelated to asthma -- shoes. Like you said, it's getting colder, and if you live anywhere like I do, you're going to have snow and ice on the ground. I have seen countless runners fall on the ice, hah. Don't be one of them -- get some shoes (or metal shoe things) that will be effective for running on ice and snow.

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Running in the cold weather can have an averse effect on people with asthma. Also, running in areas with high emissions, such as in and around cities, can aggravate some runners' asthma. The best thing to do is to always breathe through your nose to warm the air slightly, other then that I can only suggest running inside on a treadmill.

Yes, it will, but not as much as hot weather will. Do you have an inhaler like albuterol for emergencies? Use it before you run, and you'll find you have no problem whatsoever. My doctor recommended I do that and it works great.

You might have to hold off on your running till the winter is over. IDK