Climate Change Chart of San Antonio, USA

Overview of climate changes

Temperature changes

Across calendar months, monthly mean temperature shows a difference of +1.26 °C in the more recent period; this is an unweighted average of the monthly means, not a day-weighted annual figure or a measure of daytime highs. The largest monthly increase was in March, with a difference of +2.55 °C. That identifies the strongest increase among the reported monthly changes, rather than describing every month.

Changes in rainfall

Mean daily rainfall, rather than monthly rainfall totals, had an unweighted across-calendar-month difference of +0.36 mm/day. Monthly changes varied in direction: May had the largest increase, a difference of +1.80 mm/day, while April had the largest decrease, a difference of -1.34 mm/day. These monthly extremes describe changes in daily averages for those months; they do not imply that rainfall moved in the same direction in every month.

Changes in sunshine duration

Mean daily sunshine duration averaged across calendar months had a difference of -0.16 hours/day; this unweighted mean summarizes monthly averages and is not day-weighted. The monthly pattern was mixed: January recorded the largest increase, a difference of +0.85 hours/day, whereas November recorded the largest decrease, a difference of -1.18 hours/day. These are changes in mean daily hours, not statements about every day within either month.

Changes in snowfall

For mean daily snowfall, the unweighted average of monthly means across calendar months had a difference of -0.01 mm/day. Monthly changes included both directions: the largest increase was in February, with a difference of +0.33 mm/day, while the largest decrease was in January, with a difference of -0.44 mm/day. These figures describe daily averages, not monthly snowfall totals, and the small across-month mean difference does not mean that snowfall was absent.