Rain Keeps Earthquakes Away - Sometimes, in Some Places

In the Himalayas, most earthquakes (and there are a lot!) occur in the dry season, a lot less happen during the monsoon. The rain (up to 4 metres) compresses the crust both vertically and horizontally, making it more stable. Climate change may make this phenomenon more pronounced.

The same thinking applies to ice. When glaciers melt the loss of weight leads to decompression melting. At present this is noticed only in Iceland - some volcanoes erupt mostly in Summer.

You can read all about it in THIS ARTICLE.