Climate Change Chart of Ouargla (Sahara), Algeria

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +2.49 °C compared with the earlier reference period; this is an unweighted mean of the monthly means, not a day-weighted annual average or a measure of daytime maximum temperatures. The largest monthly increase occurred in September, with a difference of +3.36 °C. This identifies the strongest increase among the reported monthly changes, rather than implying that every month warmed by the same amount.

Changes in sunshine duration

Averaged across calendar months, mean daily sunshine duration had a difference of -0.21 hours/day compared with the earlier reference period. This unweighted mean describes the monthly averages collectively, rather than a day-weighted annual figure. The largest monthly decrease occurred in May, with a difference of -0.93 hours/day. By comparison, the largest monthly increase was in February, at a difference of +0.23 hours/day; these are month-specific differences in mean daily hours, not claims about every day.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of -0.02 mm/day. This is an unweighted mean of monthly means, not a day-weighted annual average, and the measure describes daily amounts rather than monthly rainfall totals. The largest monthly decrease was in March, where mean daily rainfall had a difference of -0.20 mm/day. In contrast, April recorded the largest monthly increase, with a difference of +0.08 mm/day; these month-specific changes show that the comparison varied across the calendar.