What is the avg temp of mercury?

The average surface temperature of Mercury is about 167 degrees Celsius (332 degrees Fahrenheit). However, temperatures can vary significantly due to its thin atmosphere, with daytime temperatures soaring to around 430 degrees Celsius (800 degrees Fahrenheit) and nighttime temperatures dropping to approximately -180 degrees Celsius (-290 degrees Fahrenheit). This extreme temperature fluctuation occurs because Mercury has a slow rotation period and lacks a significant atmosphere to retain heat.