Climate Change Chart of Islamabad, Pakistan

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of -0.67 °C; this is an unweighted mean of the monthly means, not a day-weighted annual average or a statement about every month. The largest monthly increase was in February, with a difference of +1.05 °C, while May had the largest decrease, at -3.27 °C. These are changes in monthly mean temperature, not daytime maximum temperatures.

Changes in rainfall

Mean daily rainfall, rather than monthly rainfall totals, had an unweighted average difference across calendar months of +0.76 mm/day. The month-to-month pattern was not uniform: September recorded the largest increase, a difference of +1.61 mm/day, whereas December had the largest decrease, a difference of -0.14 mm/day. The average describes the set of calendar-month means and does not imply that rainfall increased in every month.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.50 hours/day; this is an unweighted mean of monthly values, not a day-weighted annual figure. Changes varied by month: July saw the largest decrease, at -0.97 hours/day, while December had the largest increase, with a difference of +0.22 hours/day. These extrema show why the overall mean should not be read as a description of every month's sunshine duration.

Changes in snowfall

Mean daily snowfall also differed between the reference periods. Averaged across calendar months, its unweighted mean difference was -0.04 mm/day; the value describes monthly means and is not a monthly total. The largest monthly decrease was in February, with a difference of -0.62 mm/day, while January had the largest increase, at +0.10 mm/day. These comparisons concern recorded mean daily snowfall and do not imply that the change was the same in every month.