In 1 you would need ‘the’ because you are referring to that weather in Boston. In 2 you would say ‘a’ because you are referring to one queue (as I would say). In 3 there is no need for an article because it is a general reference unless of course you have made reference to the sauce previously and then you would say: the hot sauce.
If it’s of any help, you could look at some material on the articles I have written for the site:
This is a difficult one and you could say that there is little difference. The use of ‘a’ in the first example is really a substitute for ‘one’ - with the idea of any old horse you care to mention. The use of ‘the’ with the noun (donkey) lifts the animal out of the ordinary and in a sense elevates it to an important level.