2012: Australia's year of weather contrasts
The influence of extremes is a key talking point, with maximum temperatures on the rise and minimums on the decline. That's one takeout from the latest data, writes Climate Spectator's Daniel Palmer.
While much of the country swelters through a nasty heatwave, the official 2012 weather report has been delivered. And on the surface it was a pretty average year, with average rainfall and slightly above average temperatures. But averages don’t reveal the true story.
A wet and cold start to 2012 was counteracted by a hot and dry finish, leading to nationally averaged rainfall 11mm above the 1961–1990 mean of 465mm and temperatures 0.11 degrees above the average, the Bureau of Meteorology found in its annual Climate Statement. The degree of variation in rainfall is shown starkly in the below graph, with March nearly doubling the average, while the following nine months saw below average readings for all bar June.
All in all, it was Australia’s 40th wettest year out of 113 on record. It follows the most sodden two-year period in recorded history. The Bureau said the wet conditions early were consistent with a moderately strong La Nina event, while “El Nino-like” conditions took over mid-year.
The influence of extremes is a key talking point, with maximum temperatures on the rise and minimums on the decline. While overall average temperatures lifted 0.11 degrees, maximums were 0.51 degrees above the mean and minimums 0.28 degrees below — a discrepancy only bettered twice in 113 years.
From hot spells to floods, extreme weather events were felt across the country, most noticeably:
The slightly warmer conditions overall for 2012 represented a turnaround from 2011, when cooler than average temperatures were recorded for only the third time since 1990.
Despite cooler conditions across 2010-2012 compared to recent norms, the last decade (2003–2012) has still been one of Australia’s warmest on record; with an anomaly of +0.44 degrees, the fifth warmest 10-year period on record. This figure is eerily similar to that of global temperature changes over the past decade — with 2003-12 the third hottest decade on record, 0.45 degrees above average, according to the World Meteorological Organisation.
As for what’s in store in 2013? The Bureau suggests the hot end to last year is set to extend well into this as La Nina will not be a factor. It’s early days, but with January on track to be one of the hottest months ever, the stage is certainly set for more unwelcome records in 2013. Indeed, early forecasts suggest it may be the globe’s hottest on record.
*This piece was originally published by Climate Spectator
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