Dust on components? Slightly slower fan speed? Hotter air in surroundings? All of these things can affect the rate of heat transfer.
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It's cold as -blam!- where I live. Dust certainly isn't an issue. Not only did I just build this thing in July, but I have the fans blowing outwards in places where there are no dust filters. I'm sure it's just the thermal paste, but since now it decided to idle at a steady 30 all of the sudden after I posted this thread, I don't know what's going on. I'm checking my task manager and everything, and my browser is the only thing using any resources.