When you hear a weatherperson mention Austin’s average high temperature or rainfall next month, the numbers will be different. The National Oceanic and Atmospheric Administration is updating what it considers “normal” weather throughout the country.
And NOAA says climate changeis self-evident in the new data.
Government statistics on normal weather — including high and low temperatures and rainfall — are typically taken from a 30-year running average. That information is updated every 10 years.
For the last decade, much of what we've been told is “normal” in Austin has been based off weather data from 1981 through 2010. Next month’s update will jettison the information from the '80s and include the most recent decade.
NOAA has not released details yet. But Victor Murphy, Southern region climate service program manager with the National Weather Service, said we can expect hotter average temps. In Austin, he said, expect an increase in average yearly rainfall, but a decrease in the number of rainy days.
It’s Getting Hot In Here
Murphy didn’t get into specifics, pending NOAA’s final data release. But he said we can expect average low and high temperatures to increase by about 1/2 to 1 full degree Fahrenheit “in Austin and pretty much statewide in Texas.”
The expected change in average annual rainfall in Austin was even more striking.
“It looks like it actually increased by about 2 inches from about 34.2 inches to 36.2,” Murphy said. “But the number of days with measurable precipitation actually decreased by about maybe one day less per year.”
That increase in average rainfall, but decrease in number of wet days, shows how Austin has experienced more heavy storms in the recent past, but also more dry days. It’s a trend toward weather extremes like droughts and floods that climate scientists have been warning about for years.
“It ties right in with what we're hearing about climate change” Murphy said.
Is Texas Ready?
Using more recent information will help people better understand what to expect weather-wise in the near future. But some may worry that the 30-year rolling average leaves too much climate history out, obscuring the severity of climate change over the last century.
ANOAA article on the update pushes back against that idea. In it, Rebecca Lindsey argues comparing the 30-year averages can be a powerful took to demonstrate just how much hotter much of the U.S. has become since records began.
Murphy said the new information will do more than simply put daily weather in perspective.
“Numbers like this are really pretty huge as far as construction, engineering and things like that,” he said, suggesting the new data could help guide efforts to improve flood control and the Texas electrical grid.
“Ten years from now, will we have another 1/2 degree to 1 degree increase in temperatures going forward?” he said. “I think it stands pretty clear … that will be the case and we’ll have even more demand on electricity, on air conditioning, on infrastructure.”
