Climate Change Chart of Guatemala City, Guatemala

Overview of climate changes

Temperature changes

The mean difference across calendar months was an increase of +1.12 °C in monthly mean temperature in the more recent period. This is an unweighted comparison of monthly means, not a day-weighted annual average, and monthly means do not represent daytime maximum temperatures. The largest monthly increase was in April, with a difference of +1.68 °C; that identifies the strongest increase among the reported months, not a uniform change throughout the year.

Changes in rainfall

Averaged across calendar months, mean daily rainfall had a difference of -0.42 mm/day compared with the earlier reference period. This is an unweighted mean of monthly values, rather than an annual total, and it does not imply that rainfall decreased in every month. The largest monthly decrease was in July, at -1.81 mm/day; by contrast, November had the largest monthly increase, a difference of +0.82 mm/day. These monthly differences describe changes in daily mean amounts, not monthly rainfall totals.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months showed a difference of -0.06 hours/day in the more recent period. This unweighted comparison of monthly means is not a day-weighted annual figure and does not mean every month had less sunshine. The largest monthly decrease was in June, with a difference of -0.31 hours/day, while the largest increase was in July, at +0.21 hours/day. The contrasting monthly changes show why the overall mean should be read as a summary across calendar months rather than as a description of each month's conditions.