The frequency of a cricket's chirps is consistent with air temperature. In order to determine the temperature in Celsius, count how many chirps there are over 25 seconds then divide by 3 and add 4.
Since 1906, a special baseball game, the Midnight Sun Game, is hosted each year in Fairbanks, Alaska around the Summer Solstice. Due to nearly unending sunlight at that time, the game begins at 10:00 pm and has never needed any artificial light.
1816 is known as the Year without a Summer because the eruption of Mount Tambora (Indonesia) in April 1815. The extreme amount of volcanic ash and gas caused a global temperature decline resulting in snow in July and crop failure.