Climate Change Chart of Guarulhos, Brazil

Overview of climate changes

Changes in rainfall

Mean daily rainfall was lower on average across calendar months, with a difference of -1.22 mm/day. This is an unweighted mean of monthly averages, not a comparison of monthly rainfall totals or a day-weighted annual amount. The clearest monthly decrease was in December, where the difference was -4.29 mm/day; meanwhile, September recorded the largest increase, at +0.08 mm/day. The small increase in that month sits alongside the larger decrease elsewhere, so the mean change should not be read as a reduction in every month's rainfall.

Temperature changes

Averaged across calendar months, the difference in monthly mean temperature was +0.67 °C compared with the earlier reference period. This is an unweighted comparison of monthly means, not a day-weighted annual average, and it describes mean temperatures rather than daytime highs. The largest monthly increase was in December, with a difference of +1.27 °C; by contrast, August had the largest decrease, at -0.10 °C. These extrema show that the overall mean difference did not apply uniformly across months.

Changes in sunshine duration

Mean daily sunshine duration increased by +0.43 hours/day when averaged across calendar months, compared with the earlier reference period. This unweighted average of monthly means describes daily hours, rather than total sunshine over a year. The largest monthly increase was in December, with a difference of +1.35 hours/day, while August showed the largest decrease, at -0.12 hours/day. These opposing monthly differences indicate that the average increase does not mean sunshine duration rose in every month.