Climate Change Chart of Puerto Vallarta, Mexico

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of -0.18 °C compared with the earlier reference period; this is an unweighted average of monthly means, not a day-weighted annual figure or a measure of daytime highs. The largest monthly increase was in July, with a difference of +0.32 °C. In contrast, February had the largest monthly decrease, a difference of -0.86 °C. These contrasting monthly changes show why the average should not be read as applying uniformly across the year.

Changes in rainfall

Mean daily rainfall, rather than monthly rainfall totals, averaged across calendar months shows a difference of +0.40 mm/day in the more recent period. This unweighted average describes the overall difference between monthly means, not a change shared by every month. The largest monthly increase was in June, at a difference of +1.94 mm/day, while August recorded the largest monthly decrease, at a difference of -0.76 mm/day. The opposing directions in these months add useful context to the average daily amount.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months shows a difference of -0.32 hours/day compared with the earlier reference period. This is an unweighted comparison of monthly means, rather than a day-weighted annual average, and does not imply the same difference in each month. The largest monthly decrease occurred in June, with a difference of -0.81 hours/day. The largest increase was in January, where the difference was +0.18 hours/day, illustrating that monthly sunshine changes were not uniform.