Climate Change Chart of Karachi, Pakistan

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.22 °C; this is an unweighted summary of the monthly means, not a day-weighted annual average or a measure of daytime highs. The month-to-month pattern was not uniform: September had the largest monthly increase, a difference of +0.67 °C, while January had the largest monthly decrease, a difference of -0.34 °C. These extrema describe the largest changes in their respective directions, not a continuous change between the reference periods.

Changes in rainfall

Mean daily rainfall, rather than monthly rainfall totals, averaged across calendar months shows a difference of -0.06 mm/day; the summary is unweighted across those monthly means. The individual monthly differences varied in direction: August recorded the largest increase, a difference of +0.53 mm/day, whereas July recorded the largest decrease, a difference of -1.06 mm/day. These monthly contrasts indicate why the overall mean difference should not be read as applying to every month, or as evidence of a continuous shift between the periods.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months shows a difference of -0.37 hours/day, based on an unweighted summary of the monthly means. The largest monthly decrease was in July, with a difference of -1.08 hours/day. This monthly decrease and the overall mean describe comparisons between the two reference periods; they do not establish that sunshine declined continuously or that every month changed by the same amount.