Actually, the ash from a huge volcano (or numerous ones) will block out the sunlight and make it cooler. When Krakatoa went off in the late 1800’s it caused “the year without summer” in Europe.
A link came up in my web browser about a week ago about Krakatoa.
It has photos from an old book which I have (a reproduction) somewhere around the house. Huge book with water color paintings, all sorts of science stuff, ships diaries, personal accounts - a whole interesting mix of accounts from eruption.
It includes tidal measurements from the Thames(?) that shows the disturbance from the eruption! As well as other tidal measurements from around the world.
that was Tambora in 1815. The ‘little ice age’ ended a few years before and then ‘BAM’.
https://en.wikipedia.org/wiki/1815_eruption_of_Mount_Tambora
(yes it is wikipedia, but, it’s good for this context. I was a librarian before retirement and it is a good source for general consumption)