In 1816, severe summer climate abnormalities caused a dramatic drop in temperatures. Evidence suggests the anomaly was caused by a combination of a historic low in solar activity with a volcanic winter event, the latter caused by a succession of major volcanic eruptions capped by the 1815 eruption of Mount Tambora, in Indonesia, the largest known eruption in over 1,300 years. 
In July of 1816, inspired by the Summer that Never Was, Lord Byron (George Gordon Byron, 6th Baron Byron) wrote a poem, “Darkness”:
I had a dream, which was not all a dream.
The bright sun was extinguish’d, and the stars
Did wander darkling in the eternal space,
Rayless, and pathless, and the icy earth
Swung blind and blackening in the moonless air…
“The bright sun was extinguished…” The year 1816 was during a solar hibernation known as the Dalton Minimum. The Dalton Minimum lasted from about 1790 to 1830. It coincided with a period of lower-than-average global temperatures. 
We have now entered a new cycle of solar hibernation, reports the Space and Science Research Corporation (SSRC). This current cycle “is caused by a repeating 206 year cycle of the Sun,” known as the quasibicentennial cycle. “SSRC research shows the next solar hibernation will bring a long period of cold just as it has done before every time this cycle ‘turns over’ from its global warming phase to its global cooling phase. In addition, SSRC research backed by that of other researchers has shown a high degree of correlation between solar hibernations and the world’s largest earthquakes and volcanic eruptions.” 
(Incidentally, we have recently entered a new 200+ year Pluto cycle. When the United States were born on July 4, 1776, Pluto was in Capricorn. It has taken more than 200 years for Pluto to again return to Capricorn. This happened, according to an article in Vanity Fair magazine, around late December of 2006. “A planetary configuration not seen since 1776 is coming our way, heralding chaos, revolution, and rebirth,” wrote author Michael Lutin. (Background: General Predictions for 2014 and Beyond, Ersjdamoo’s Blog, January 1, 2014.))
Electrical disturbances in the upper atmosphere vary according to solar activity. There is an interplay of telluric forces and atmospheric forces. Heat originating in the Earth’s interior (telluric force) has little or nothing to do with the Sun. Solar Cycle 24, which began January 4, 2008 and is on track to be the Solar Cycle with the lowest recorded sunspot activity since accurate records began in 1750, means the mediating electrical disturbances in the upper atmosphere are more negatively charged. This in turn causes columns of cold from outer space to descend closer to the Earth. (Background: Heat From the Earth, Ersjdamoo’s Blog, November 24, 2014.)
There is a high degree of correlation between solar hibernations and the world’s largest earthquakes and volcanic eruptions. As the negatively charged atmospheric forces descend closer to the Earth, there is closer contact with the positively charged telluric forces. Like a magnet, the telluric forces are drawn upwards and volcanoes and earthquakes increase.
A newly formed vent in the Kilauea, Hawaii volcano opened on June 27, 2014.  On Thanksgiving 2014, in southern Japan, a volcano which had not erupted in 22 years activated. Mount Aso spewed out lava debris and smoke, shooting plumes of ash 3,280 feet into the sky.  In May of 2010, John L. Casey, a former space shuttle engineer and NASA consultant, stated that we would soon experience earthquakes and volcanic eruptions of historic scale. Only ten months later, on March 11, 2011, a catastrophic magnitude 9.0 earthquake struck Japan. 
And it was during the Dalton Minimum (circa 1790 to 1830) that the New Madrid earthquake, the most powerful series of earthquakes in North American history, struck the Mississippi valley, beginning December 16, 1811. Then, in 1815, also coinciding with the Dalton Minimum, the Mount Tambora volcano manifested the largest and deadliest volcanic eruption in recorded history at the time. 
But which came first, the chicken or the egg? The experts say it was the volcanic Mount Tambora eruption of 1815, with its ashes spewed into the atmosphere, which brought about the 1816 Summer That Never Was. Aye, but what had caused the Mount Tambora eruption as well as earlier telluric blasts such as the 1813 Suwanosejima in the Ryukyu Islands, Japan and the 1814, Mayon in the Philippines?  Offered for your consideration: That like a magnet, the telluric forces were drawn upwards by negatively charged atmospheric forces descending closer to the Earth, and that these negatively charged atmospheric forces had, in turn, been increased due to the Dalton Minimum.
——- Sources ——-
 “Year Without a Summer”, Wikipedia, November 27, 2014.
 “Dalton Minimum”, Wikipedia, November 27, 2014.
 “Why Should We Be Concerned about the Next Cold Climate Era?”, Space and Science Research Corporation. http://spaceandscience.net/id68.html
 Lava’s slow approach is reshaping Hawaii village life”, by Maria L. La Ganga. Los Angeles Times, November 3, 2014.
 “Volcano in south Japan erupts, disrupting flights”, AP, November 27, 2014. Updated: November 28, 2014.
 “Sure Is Cold”, Ersjdamoo’s Blog, November 19, 2014. https://ersjdamoo.wordpress.com/2014/11/19/sure-is-cold/
 Dark Winter: How the Sun Is Causing a 30-Year Cold Spell, by John L. Casey. Kindle e-book edition.