The GERDA experiment at LNGS of INFN is equipped with an active muon veto.
The main part of the system is a water Cherenkov veto with 66~PMTs in the water
tank surrounding the GERDA cryostat. The muon flux recorded by this veto shows
a seasonal modulation. Two effects have been identified which are caused by
secondary muons from the CNGS neutrino beam (2.2 %) and a temperature
modulation of the atmosphere (1.4 %). A mean cosmic muon rate of $I^0_{mu} =
(3.477 pm 0.002_{ extrm{stat}} pm 0.067_{ extrm{sys}}) imes
10^{-4}$/(s$cdot$m$^2$) was found in good agreement with other experiments at
LNGS at a depth of 3500~meter water equivalent.
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