Airport reference temperature

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Airport reference temperature is defined as the monthly mean of average daily temperature (Ta) for the hottest month of the year plus one-third the difference of this temperature (Ta) and the monthly mean of the maximum daily temperature (Tm) for the same month of the year.

Thus airport reference temperature =

Ta + (TmTa) / 3

[edit] References

Airport Engineering by Norman J. Ashford and Paul H. Wright, 3d edition, page 234. [1]