The CPI-W for January 2018 was 241.919, and for February 2018 it was 242.988
Both are a significant increase over the previous months. It is also significantly higher than the 2017 benchmark average. That average is 239.668
The last three month average for the CPI-W now stands at 241.811
The 2019 COLA will be determined by how much the average for July, August and September 2018 exceeds the 239.668 average for the same months in 2017.
The CPI-W has increased by 2.3% over the last twelve months. The Social Security actuaries estimate an increase of about 3% for 2019.