And RSS is reasonably close the surface trends, albeit with a slightly different annual pattern. (deepclimate.org)
There is a distinct annual pattern to the NSA data, and I have done my own seasonal adjustments and they do not reduce that variability nearly as much as the BLS methods which involve ARIMA models. (alephblog.com)
Koppen divined what was effective that is available for the plants by identifying three different annual patterns: (drtimball.com)