I am not sure the first day temperature was actually recorded, but according to http://www.ucsusa.org/global_warming/science_and_impacts/science/global-thermometer-still-climbing.html we started taking regular temperature records in the 1880’s.
The first real thermometer dates to 1638.
The first standardized scale for measuring temperature was developed by Daniel Gabriel Fahrenheit in 1714. Prior to his invention, thermometers existed but could only measure variations in temperature through approximate comparions with inaccurate instruments, making any temperature recorded prior to Fahrenheit’s scale unreliable. In 1742, Anders Celsius created the centrigrade scale, which was divided into 100 degrees between the freezing and boiling points of pure water.
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