WRAL WeatherCenter Blog

The recent question about days over 95 in August leads me to a related one: what's the normal number of days 90 and above in a summer? And the normal number of 100+ days? Are we at a record yet in these categories?

Posted August 29, 2007

MIKE MOSS SAYS:       Phelps,      The normal number of days at or above 90 for the Raleigh-Durham airport is 39. We are currently at 64 days (as of 29 Aug) and the record for RDU was 72 in 1953. Note that official records for "Raleigh" began being taken at the airport in the mid 1940s, with a series of other "official" Raleigh sites before that stretching back to 1887. Records from that entire stretch include 1941, when the temperature (then taken at Raleigh Municipal Airport) reached 90 or higher 82 times.


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  • Mike Moss Sep 2, 2007

    Garyjuka, Your math is right on the money, and you make an excellent point. I don't have a standard deviation handy for August monthly average temperature, but as you implied August tends to be a pretty stable month (dog days and Bermuda High) year to year, and to exceed the previous record by 3.5 degrees, while the previous record was 3.4 degrees above the normal, is an amazing jump. The new record ended up a little lower than the last reference you had seen, with 84.1 the final value, breaking the previous August record of 80.6 from 1995.

  • garyjuka Aug 30, 2007

    Saw on another site that the hottest August temperatures ever were all 80.x. And this year we are at about 84.7. That's amazing in that if my math is right, we have shattered the *record* by a larger margin than the prior record exceeded the normal august mean. That is something that I'm sure would have been considered statistically implausible.