Table:  Temperature Scale Comparison for Notable Temperature States
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Notable Temperature     Kelvin (K)    Celsius (C)    Fahrenheit (F)      Reference/Comment
      State
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absolute zero              0          -273.15        NOT worth knowing   A
coincidence              233.15        -40            -40                either way it's cold
water freezing           273.15          0             32                A/standard pressure
average Earth surface    288          ∼ 15           ∼ 59                A 
human warmish            300            26.85          80.33
average human body       310          ∼ 37           ∼ 98                A 
water boiling            373.1339       99.9839       211.97102          A/standard pressure
water boiling rounded    373           100            212
iron melting            1811          1538            who cares          Wikipedia:  Iron
iron boiling            3134          2862              "                Wikipedia:  Iron
solar photosphere       5772          who cares         "                B
Sun center             15.7(2)*10**6    "               "                C
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Notes:

1. A = Wikipedia: Conversion of units of temperature: Comparison of temperature scales.
2. B = NASA: Sun Fact Sheet/stellar effective temperature: The solar photosphere is that layer of the Sun from which photons can escape to infinity. It has a sort of average temperature called the effective temperature.
3. C= Wikipeda: Standard solar model: Core temperature prediction. The central temperature of the Sun is NOT a direct observable. The value shown combines information from the standard solar model and the solar neutrino flux which is a direct observable of solar core's neutrino production.
4. As temperatures increase in size, the difference between the Kelvin scale and the Celsius scale effectively vanishes. For example, 10**6 K and 10**6 C are usually the same to within error.
5. For more details on temperature and the Kelvin scale, see an Exposition on the Kelvin or Absolute Scale.
6. In yours truly's, we should just drop Fahrenheit and Celsius scale altogether and just use the Kelvin scale all the time. This is my crank idea. But no one ever listens to me.