Measurements indicate that the worldwide average temperature dropped about a half degree Celsius for a couple of years after the eruption of Mt. St. Helens.

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The eruption of Mt. St. Helens in 1980 did not cause a worldwide drop in temperature. The immediate area around the volcano experienced a cooling effect due to the ash and debris in the atmosphere, but this effect was localized and temporary. Overall, the global temperature has been steadily increasing over the past few decades.

Measurements Indicate That the Worldwide Average Temperature Dropped About a Half