Is this year downtown Texas with 100 degree days?

AUSTIN (KXAN): It’s been a crazy year because of the heat in central Texas.

Our first 100 degree day almost surprised on June 14, but then we spent about 1.5 months until the next. That second 100 degree day fell on July 25th and was our only 100 degree day in July.

The heat increased a bit in August with three days of 100 degrees, but it was such a humid, cool summer that we had to wait until September to see that the 100s really added up. September had five three-digit days, equaling the number of 100 from the previous three months.

100 days of degree in 2021

Thus, the total number of three-digit days in 2021 is 10. In an average year we receive 29. Usually, most arrive in August.

Average number of three-digit days in each month.

Have we finished the 100 degree days this year?

To answer that, we looked back at history to find that our typical final day of 100 degrees arrives on August 30 on average. But this year we had five three-digit days AFTER.

The LAST 100-degree day in the history of the Austin area happened twice on October 2, 1938 and 1923.

Since 1897, only September 10th has had three-digit heat AFTER September 15th. This seems to suggest that our chances of heat over three digits are low.

But the September heat has become more frequent in the last decade. Eight of the last ten years have had 100 in September, two of which will arrive after September 15th.

The most recent three-digit September in the second half of the month was 2019, when we reached 100 degrees or more until September 25th.

Last year, our last three-digit day came on September 1st. With temperatures forecast above average most of the rest of the month, it’s too early to rule out more days of 100 degrees.

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