The effect of large-scale atmospheric circulation on the methane mixing ratio in Mace Head (Ireland) is investigated for the period of March 1994 - December 2000. One of the prominent teleconnection patterns in all seasons, namely, North Atlantic Oscillation (NAO) is used. The intra-annual variability of methane is characterized by a minimum in July and maximums in winter (main) and in spring (secondary). However, in some years the winter maximum is less than the spring one. It is shown that dust in these years the strong positive phase of the NAO (westerly) or small NAO indices (meridionality) were registered. To the contrary, just in winters with the strong negative NAO phase the winter maximum of the atmospheric methane content exceeded the spring one.