Climate Change Chart of Santiago, Chile

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +0.36 °C compared with the earlier reference period. This is a comparison of monthly means, not daytime maximum temperatures, and the unweighted average across calendar months does not describe every month individually. The largest monthly increase was in July, at +1.20 °C; the largest decrease was in December, at -0.29 °C. These monthly extremes show that the overall mean difference does not apply uniformly across the calendar.

Changes in rainfall

Mean daily rainfall, averaged across calendar months, had a difference of -0.38 mm/day in the more recent period. This is an unweighted average of monthly means rather than a day-weighted annual average, and it describes daily averages rather than monthly rainfall totals. The largest monthly decrease was in June, with a difference of -2.22 mm/day. By contrast, the largest monthly increases were in April / August, each with a difference of +0.22 mm/day; these month-specific changes help show how the average masks differing monthly shifts.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.21 hours/day compared with the earlier reference period. This unweighted mean of monthly averages is not a day-weighted annual figure, so it should not be read as a change shared by every month. The largest monthly decrease occurred in September, at -0.76 hours/day, while the largest increase occurred in June, at +0.43 hours/day. These daily-hour differences describe monthly averages, not the sunshine duration of individual days.

Changes in snowfall

Averaged across calendar months, mean daily snowfall had a difference of +0.01 mm/day in the more recent period. The small rounded mean difference summarizes monthly averages; it does not establish that snowfall was absent or unchanged in every month. The largest monthly increase was in July, at +0.34 mm/day, while the largest decrease was in June, at -0.15 mm/day. These are differences in mean daily amounts, not monthly snowfall totals.