Turbulent fluctuations were measured at a height of 2.5 m in stable co
nditions over grass to investigate the variability of the second- and
third-order moments involving temperature, humidity and vertical wind
velocity. With the exception of the normalized second moment of temper
ature, very little variation of the normalized moments was found with
changes in the dimensionless stability parameter zeta = z/L, where L i
s the Obukhov stability length. Such limited variation is expected for
stable conditions, and the normalized second moment of temperature mi
ght have been affected by nonstationary conditions. In addition, the v
ariability of the normalized moments was lessened by computing the tur
bulence statistics over 56 min, instead of 26 min. Values of third-ord
er moments involving the vertical velocity were all dose to zero.