Climate Change Chart of Mashhad, Iran

Overview of climate changes

Temperature changes

Monthly mean temperature was higher overall in the more recent period: the difference averaged across calendar months was +1.02 °C. This is a comparison of monthly means, not daytime maximum temperatures, and it does not imply that every month was warmer. The largest monthly increase was in February, at a difference of +2.08 °C. By contrast, the largest monthly decrease occurred in October, with a difference of -0.57 °C.

Changes in snowfall

Mean daily snowfall decreased overall in the more recent period: the difference averaged across calendar months was -0.39 mm/day. This is an aggregate of unweighted monthly means, not a change in a monthly or annual snowfall total. The largest monthly decrease was in January, with a difference of -1.82 mm/day. The largest monthly increase, a difference of +0.10 mm/day, occurred in October; these contrasting monthly results show why the overall average does not describe every month.

Changes in rainfall

Mean daily rainfall increased overall in the more recent period, with a difference averaged across calendar months of +0.14 mm/day. This summarizes unweighted monthly means; it is not a change in annual totals or a claim that rainfall rose in every month. The largest monthly increase was in May, at a difference of +0.54 mm/day. In January, the largest monthly decrease was a difference of -0.08 mm/day. These are changes in mean daily amounts, not monthly rainfall totals.

Changes in sunshine duration

Mean daily sunshine duration was lower overall in the more recent period, with a difference averaged across calendar months of -0.57 hours/day. This aggregate describes unweighted monthly means and does not mean that sunshine declined in every month. The largest monthly decrease occurred in May, with a difference of -1.04 hours/day in mean daily sunshine duration.