see also https://www.ncei.noaa.gov/access/monitoring/products/.
Daily data time series analysis
Summary of trend
## Min. 1st Qu. Median Mean 3rd Qu. Max.
## 81.16 83.27 84.06 83.94 84.65 86.39
Daily data time series analysis
Summary of trend
## Min. 1st Qu. Median Mean 3rd Qu. Max.
## 63.26 64.02 64.75 64.92 65.58 68.32
Daily data time series analysis
Summary of trend
## Min. 1st Qu. Median Mean 3rd Qu. Max.
## 72.55 73.86 74.20 74.43 75.03 77.36
Monthly data time series analysis
Summary of trend
## Min. 1st Qu. Median Mean 3rd Qu. Max.
## 3.883 4.389 4.452 4.471 4.615 4.863