What follows is the data from the Tanzanian Island of Zanzibar in the Indian Ocean.
NASA’s website tells us that the GHCN V3 Unadjusted data gives the mean annual temperature up to 2007, despite the V3 dataset being updated up to July 2019, and the trend is a cooling.
According to NASA, in the GHCN V4 dataset, the station has the mean annual temperature data after 2007, not only the data of up to 2007 from 1880.
▲ GHCN V4 Unadjusted vs. GHCN V4 adj – homogenized
I wonder just how much NASA likes data alteration?
▲ GHCN V3 Unadjusted vs GHCN V4 Unadjusted
▲ GHCN V4 Unadjusted vs. GHCN V4 adj – homogenized and GHCN V3 Unadjusted