Climate Change Chart of Bissau, Guinea-Bissau

Overview of climate changes

Temperature changes

Averaged across calendar months, the monthly mean temperature difference was +0.65 °C compared with the earlier reference period; this unweighted mean summarizes the month-by-month averages, rather than a day-weighted annual figure or daytime maximum temperatures. The largest monthly increase in mean temperature was in October, with a difference of +1.16 °C. This identifies the most pronounced increase among the supplied monthly differences, not a change that necessarily applied to every month.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of -0.22 mm/day in the more recent period. This is an unweighted mean of monthly means, not an annual total or a day-weighted average, so it summarizes the overall monthly pattern without implying the same difference in each month. The largest monthly decrease in mean daily rainfall occurred in June, with a difference of -2.22 mm/day. By contrast, the largest monthly increase was in August, at +0.95 mm/day; these opposite monthly differences show why the mean alone does not describe every month. The values refer to daily means, not monthly rainfall totals.

Changes in sunshine duration

Averaged across calendar months, mean daily sunshine duration had a difference of -0.34 hours/day compared with the earlier reference period. This unweighted summary describes the monthly means, rather than a day-weighted annual average or an identical change in every month. The largest monthly decrease in mean daily sunshine duration was in July, where the difference was -0.94 hours/day. This marks the strongest decrease among the supplied monthly differences, without establishing that sunshine duration decreased by the same amount in other months.