Hi V.,
This seems to be the age that it starts. My son is 21 months old and he started a few months ago. I have to say, his tantrums are mild but I still address them while they are happening.
I agree with one mom who suggested that you and hubby are on the same page. Lucky, or unlucky (not sure yet), I am the one that takes care of our son and that includes telling him yes or no and also handling his tantrums. If your hubby caves in time after time, he will only sabotage your efforts.
One thing I read that seems to help me correct my son is telling him something positive in place of the negative. For example, if my son is climbing up on something and I tell him not to do it, he doesn't usually listen. However, if I give him a positive or active command, he will. Instead I tell him, Eli please put your feet down on the ground or something to that effect. It's harder to think of talking to them that way, but it seems to be more helpful. It's exhausting saying no all day, so I try to think of other ways.
Also, I don't ignore my son when he is throwing a tantrum. I try to express his feelings out loud to him and be sympathetic towards him. The other night he got mad because I wouldn't give him a sticker. He threw himself down on the ground. I went over to him and said "No sir, mama doesn't like when you do that. I told you you could have one sticker and I meant it. I'm sorry you are upset but you can have one tomorrow." Not sure how much he understands, but I think it helps when i explain the reasoning behind the no. It feels a little goofy, but I think it helps.
I also told my son instead of throwing himself down on the ground that he should growl like a lion when he's mad. It worked as a good distraction.
Hope these were some helpful tips. Good luck, and just like most things, it's a phase that will pass just hang in there.