Climate Change Chart of Bruny Island, Australia

Overview of climate changes

Temperature changes

Averaged across calendar months, monthly mean temperature shows a difference of +1.53 °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 maximum temperatures. The largest monthly increase in mean temperature was in June, with a difference of +2.95 °C. This identifies the strongest increase among the supplied monthly differences, rather than indicating that every month warmed by the same amount.

Changes in rainfall

Mean daily rainfall averaged across calendar months had a difference of +0.52 mm/day in the more recent period. This unweighted mean of monthly averages describes an aggregate across calendar months, not a day-weighted annual rainfall average or a monthly rainfall total. The largest monthly increase in mean daily rainfall occurred in June, with a difference of +1.19 mm/day. That monthly comparison marks the strongest increase in the supplied data, but does not imply the same change in other months.

Changes in sunshine duration

Mean daily sunshine duration, averaged across calendar months, had a difference of -0.41 hours/day compared with the earlier period. This is an unweighted average of monthly mean daily hours, so it summarizes the calendar-month means rather than every day or a day-weighted annual figure. The largest monthly decrease in mean daily sunshine was in November, with a difference of -0.88 hours/day. The monthly extreme does not establish that sunshine duration decreased by that amount in other months.

Changes in snowfall

Mean daily snowfall averaged across calendar months had a difference of -0.05 mm/day. This small aggregate decrease is reported at the supplied precision; it does not establish that snowfall was absent or that every calendar month changed in the same way. Monthly snowfall differences were not uniform: the largest increase was in November, with a difference of +0.03 mm/day, while the largest decrease was in August, with a difference of -0.37 mm/day. These are changes in mean daily amounts, not monthly snowfall totals.