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Table 4 1970–2012 monthly relative humidity trends at intercontinental airport

From: Changing rainfall and humidity within Southeast Texas

Measurement Rainfall in inches least-squares equation (y = RH, x = number of months since Dec 1969) Decadal trend (%/decade) P-value (slope ≠ 0)
IAH seasonally-adjusted relative humidity at 0:00 (%) y = −0.013x + 87.97 −1.56 0.00
IAH seasonally-adjusted relative humidity at 6:00 (%) y = −0.012x + 87.95 −1.44 0.00
IAH seasonally-adjusted relative humidity at 12:00 (%) y = −0.009x + 61.03 −1.08 0.00
IAH seasonally-adjusted relative humidity at 18:00 (%) y = −0.010x + 66.66 −1.20 0.00