Climate Change Chart of Sanaa, Yemen

Overview of climate changes

Temperature changes

The monthly mean temperature difference, averaged across calendar months, was an increase of +2.16 °C compared with the earlier reference period; this unweighted summary describes monthly means, not daytime maximum temperatures or the conditions in every month. The largest monthly increase was in July, with a difference of +3.69 °C in mean temperature, making that month the clearest example of a larger shift in the supplied comparison without implying a continuous change between reference periods.

Changes in rainfall

Mean daily rainfall had an averaged-across-calendar-months decrease of -0.77 mm/day; this describes the difference between monthly means rather than a change in monthly rainfall totals or in the number of rainy days. The largest monthly decrease was in July, at -3.40 mm/day in mean daily rainfall, while October had the largest increase, a difference of +0.19 mm/day. These opposing monthly differences show why the overall average does not describe rainfall in every month.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a decrease of -0.08 hours/day. The largest monthly decrease was in June, at -0.36 hours/day, while the largest increase was in March, at +0.17 hours/day; these are differences in daily averages, not a forecast of sunshine on particular days.