The bitterly cold President's Day earlier this week appears to be the final gasp of the cold weather regime we had been stuck in for almost five weeks. During that period the mean temperature in Boston was 6.6°F (3.7°C) below the climatological average. This cold regime was preceded by a warm regime of just over five weeks, in which the mean temperature was 10.0°F (5.6°C) above the climatological average. Now, it appears that we are settling into a flow pattern conducive to temperature variations about the climatological average, rather than persistent warmth or cold.