[yvely]

Wasn't this fairly special due to the amount of vapour? I remember reading it increased atmospheric water content by like 10%. It's so unimaginable to me that it simply is not related to record years.

[jfengel]

Water vapor doesn't remain in the air for long. Unlike CO2 and sulfur dioxide, water vapor condenses to liquid water and falls out of the atmosphere.

So a volcano's water vapor effects (warming) can last days, while the sulfur dioxide effects (cooling) will last months or years.