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What's five times hotter than the sun and capable of sending a DeLorean back to the future? Yep, the answer is a bolt of lightning, which can reach temperatures of roughly 30,000 kelvins (53,540 degrees Fahrenheit). The sun, on the other hand, is eclipsed in this case - its surface temperature is just 6,000 kelvins (10,340 degrees Fahrenheit).
Of interest is the maximum value which is fairly regularly found. This value turns out to be around 1200Â°C, although a typical post-flashover room fire will more commonly be 900~1000Â°C. The time-temperature curve for the standard fire endurance test, ASTM E 119 [13] goes up to 1260Â°C, but this is reached only in 8 hr.