Climate and Weather

Wonder if this will be the hottest October, sure feels like it locally...no idea what the rest of the globe is seeing.
 
What is the simplest equation that encompasses the historical GISTEMP sequence? I decided to play with it for the heck of it. The number of terms in the equation needed to represent the data tells you something about composite forcings.

Turns out even just two terms does an OK job. The first term is a sine wave set to oscillate with a yearly periodicity and an amplitude of about +/- 1°C. That captures seasonal change. Just that term is the green line.

The second term is a forcing term added on top of the seasonal oscillation. That's the brown line. With the exception of the 1930's warming and 60's-70's cooling periods (must have forgotten to fake those out) one exponential term captures the entire historical data set pretty well.
 
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