Climate Change Chart of San Salvador, El Salvador

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.85 °C compared with the earlier reference 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 January, with a difference of +1.66 °C in the more recent period. That identifies the strongest month-specific increase among the reported temperature differences, rather than implying that every month changed by the same amount.

Changes in rainfall

Mean daily rainfall, rather than monthly rainfall totals, was higher on average across calendar months: the difference between the periods was +1.17 mm/day. This unweighted average of monthly means summarizes the overall comparison without implying an increase in every month. The largest monthly increase occurred in May, where mean daily rainfall had a difference of +2.61 mm/day in the more recent period. This marks the most pronounced reported monthly increase, not a change in monthly totals.

Changes in sunshine duration

Mean daily sunshine duration had an average difference of -0.05 hours/day across calendar months, a small decrease in the unweighted comparison of monthly means rather than a day-weighted annual measure. Month-to-month differences did not all point in that direction: July recorded the largest increase, with a difference of +0.40 hours/day, while May had the largest decrease, with a difference of -0.38 hours/day. These contrasting monthly results show why the overall average should not be read as a uniform change throughout the year.