Climate Change Chart of Austin, USA

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.15 °C in the more recent period; this is an unweighted comparison of the monthly means, not a day-weighted annual figure or a measure of daytime maximum temperatures. The largest monthly increase was in March, with a difference of +2.38 °C. That identifies the most pronounced monthly increase, while the overall mean summarizes the months collectively and does not imply that every month became warmer.

Changes in rainfall

Mean daily rainfall averaged across calendar months shows a difference of +0.74 mm/day in the more recent period. This unweighted comparison of monthly means is not a day-weighted annual average, and it describes daily amounts rather than monthly totals. The largest monthly increase occurred in May, at a difference of +2.23 mm/day, whereas April had the largest monthly decrease, with a difference of -0.90 mm/day. These contrasting monthly changes show why the mean should not be read as a description of rainfall in every month.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, had a difference of -0.20 hours/day in the more recent period; this is an unweighted mean of monthly values, not a day-weighted annual average. The largest monthly increase was in January, with a difference of +0.65 hours/day, while November recorded the largest monthly decrease, with a difference of -0.96 hours/day. The aggregate decrease therefore does not mean sunshine duration decreased in every month.

Changes in snowfall

Mean daily snowfall averaged across calendar months had a difference of 0.00 mm/day at the displayed precision. That unchanged rounded mean does not establish that snowfall was absent or that every monthly value was identical. In the more recent period, the largest monthly increase was in February, with a difference of +0.37 mm/day; the largest monthly decrease was in January, with a difference of -0.41 mm/day. These are daily-mean amounts, not monthly snowfall totals.