According to the data published by Brazil's National Institute for Space Research (INPE) and Imazon, a Brazilian NGO, month-to-month deforestation is highly variable as presented.
As the alert-based deforestation detection systems do not penetrate cloud cover, so from roughly November to April, the estimates are unreliable compared to the same month in the previous year. Moreover, most of the forest clearing in the Amazon occurs in the dry season, and deforestation may increase earlier than usual.
Due to this reason, the most accurate deforestation comparisons are made year-on-year. The "deforestation year" for Brazil ends on July 31 during the peak of the dry season when the most significant extent of forest is visible via satellite.
Moreover, short-term data can provide trends over more extended periods. Comparing 12 consecutive months of alert data will give a pretty good indication of deforestation relative to other years.
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