1816: The temperature reached 92 degrees at Salem, Massachusetts during an early heat wave, but then plunged 49 degrees in 24 hours to commence the famous “year without a summer.” Snow fell near Quebec City, Quebec Canada from the 6th through the 10th and accumulated up to a foot with “drifts reaching the axletrees of carriages.”
1894: One of the greatest floods in U.S. history occurred as the Willamette River overflowed to inundate half of the business district of Portland, Oregon. The river crested at 33.5 feet, the worst flood ever recorded in the city.
Source: The Oregon Encylopedia.
1897: Light to heavy frost, and in some localities, killing frost occurred on the 6th and 7th in South Dakota. These cold temperatures along with last season frost in May and wet conditions several hampered the planting season.
— Mike Bettes (@mikebettes) June 7, 2017