Climate Change Chart of Mexico City, Mexico

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.40 °C in the more recent period; this is an unweighted comparison of 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 +2.12 °C. This identifies the strongest increase among the supplied monthly changes, rather than indicating that every month warmed by the same amount.

Changes in rainfall

Mean daily rainfall, averaged across calendar months, has a difference of +1.23 mm/day; this describes the aggregate of monthly means, not monthly rainfall totals or a change in the number of rainy days. The largest monthly increase in mean daily rainfall occurred in September, at +3.75 mm/day, while the largest decrease was in January, at -0.26 mm/day. These contrasting month-specific differences show why the overall mean should not be read as a uniform change throughout the year.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months has a difference of -0.10 hours/day. The largest monthly decrease was in June, at -0.38 hours/day, while the largest increase was in January, at +0.29 hours/day; these monthly averages do not describe sunshine on every individual day.