  We investigate the stochasticity in temperature fluctuations in the cosmic
microwave background (CMB) radiation data from {\it Wilkinson Microwave
Anisotropy Probe}. We show that the angular fluctuations of the temperature is
a Markov process with a {\it Markov angular scale}, $\Theta_{\rm
Markov}=1.01^{+0.09}_{-0.07}$. We characterize the complexity of the CMB
fluctuations by means of a Fokker-Planck or Langevin equation and measure the
associated Kramers-Moyal coefficients for the fluctuating temperature field
$T(\hat n)$ and its increment, $\Delta T =T(\hat n_1) - T(\hat n_2)$. Through
this method we show that temperature fluctuations in the CMB has fat tails
compared to a Gaussian distribution.
