The author is a grape farmer and wine maker, and a close observer of climate.
It is widely asserted that grape vintages are nowadays earlier, due to hotter summers. I reject that assertion. Winters are warmer than in the past. Not summers. The earlier start to a longer growing season and enhanced availability of CO2 enhances photosynthetic capacity. It improves efficiency in the use of scarce water by the grape vine. This very likely accounts for the earlier time of ripening. In addition, when the ripening month has been in February, the warmest month, and it occurs in January, the maturation period is cooler than hitherto, an advantage.
The Australian Bureau of Meteorology’s maintains that Australia’s climate has warmed on average by 1.44 ± 0.24 °C since national records began in 1910. But this statistic is the result of averaging monthly data that gives equal weight to autumn, winter, spring…
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