Climate Change Chart of Nezahualcoyotl, Mexico

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.56 °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 highs. The largest monthly increase was in February, with a difference of +2.09 °C. That identifies the strongest increase among the monthly comparisons, rather than implying that every month warmed by the same amount.

Changes in rainfall

Mean daily rainfall changed little on average across calendar months: the unweighted mean of monthly means was a difference of +0.02 mm/day, rather than a day-weighted annual total or a monthly accumulation. The monthly pattern was not uniform, however. In September, the largest increase was a difference of +1.22 mm/day, while July had the largest decrease, a difference of -0.81 mm/day. These are changes in mean daily rainfall for those months, not claims about every day or the rainfall total for a month.

Changes in sunshine duration

Mean daily sunshine duration, measured in hours per day, had an unweighted across-month average difference of -0.04 hours/day; this summarizes the calendar-month means and is not a day-weighted annual figure. The month-to-month differences went in both directions: January recorded the largest increase, a difference of +0.29 hours/day, whereas April recorded the largest decrease, a difference of -0.22 hours/day. These extrema describe monthly mean conditions, not the sunshine duration on every individual day.