Climate Change Chart of Oaxaca, Mexico

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.54 °C compared with the earlier reference period. This is a mean of the monthly means, not a day-weighted annual average, and it describes a shift in average conditions rather than daytime maximum temperatures or every individual month. The largest monthly increase in mean temperature was in April, with a difference of +2.47 °C. That identifies the strongest monthly increase, not necessarily the same change in other months.

Changes in rainfall

Averaged across calendar months, mean daily rainfall increased by a difference of +0.55 mm/day. This is an unweighted comparison of monthly means, not a day-weighted annual average or a monthly rainfall total; it does not mean rainfall rose in every month. The largest monthly increase was in September, where mean daily rainfall had a difference of +2.58 mm/day. By contrast, April had the largest monthly decrease, with a difference of -0.53 mm/day. These monthly differences show that the overall mean does not describe the direction of change in every month.

Changes in sunshine duration

Averaged across calendar months, mean daily sunshine duration decreased by a difference of -0.15 hours/day. The mean is based on monthly averages rather than a day-weighted annual figure, and it does not imply that sunshine decreased in every month. The largest monthly decrease was in September, with a difference of -0.41 hours/day in mean daily sunshine. In December, the largest monthly increase was much smaller in scale, at a difference of +0.03 hours/day; each figure describes its specified monthly mean, not day-to-day conditions.