Well, here's what the USGS says..
I honestly think.. (Leaving politics & Grant funding aside)..
We honestly have NO "real-time",, Historical, Data too confirm, one way or the other effects on the Northern/Southern Hemispheres of Our Planet, Of Huge, or much even less smaller (Numerious), events, too really make a judgement call, (Or even a attempt of Modeling!)..
For example, has, or if even, it can be, the current eruption of Italy's Stromboli Volcano be factored into the current weather patterns?
They can & do cause Massive land, features, geological & Topographical changes..
A New "Baby" Island Has Been Spotted in the Middle of the Ocean After Volcano Eruption..
When an underwater volcano erupted in the middle of the ocean this month, it left something unexpected behind: A "baby" island scientists observed mere hours after the eruption. The toddler has continued to grow in the weeks since. But experts say it may not last. Read on to find out why. 1...
www.yahoo.com
That said..
""
Do volcanoes affect weather?
Yes, volcanoes can affect weather and the Earth's climate. Following the 1991 eruption of Mount Pinatubo in the Philippines, cooler than normal temperatures were recorded worldwide and brilliant sunsets and sunrises were attributed to this eruption that sent fine ash and gases high into the stratosphere, forming a large volcanic cloud that drifted around the world.""
read more..
https://www.usgs.gov/faqs/do-volcanoes-affect-weather
Also read, Year without a summer..
"In the summer of 1816, the Northern Hemisphere was plagued by a weather disruption of seemingly biblical proportions. Following a relatively ordinary early spring, temperatures in the eastern United States plunged back below freezing, and communities from New England to Virginia experienced heavy snowfalls and crop-killing frost during June, July and August.""
In the summer of 1816, the Northern Hemisphere was plagued by a weather disruption of seemingly biblical proportions. Following a relatively ordinary early spring, temperatures in the eastern United States plunged back below freezing, and communities from New England to Virginia experienced...
www.history.com