September Climate Recap
September was a tale of two seasons as far as temperatures were concerned – summer for the first half of the month and fall for the last couple of weeks. From the 1st through the 17th, high temperatures averaged 88 degrees with only four morning lows in the 60s and only one daily average temperature below normal. From the 18th on, high temperatures averaged 76 degrees, morning lows routinely dropped into the 50s, and only one daily average temperature was above normal. Because cool anomalies to end the month were warmer than the warm anomalies to start it, the monthly average temperature ended up just under a degree below normal.
September is typically the second driest month of the year behind August, and September 2020 kept that statistic trending the right direction with just over 1.5″ of rain at Memphis International Airport and under 3″ in Bartlett. A large pat of that differential occurred on the 12th when Bartlett recorded over an inch of rain and the airport was under 0.10″. There were seven days with measurable rain for the month, right at average.
September is not typically a severe weather month and 2020 help serve. There was one severe weather event – scattered strong thunderstorms on the evening of the 2nd. Severe Thunderstorm Warnings were issued for the metro and a Tornado Warning was issued for Crittenden County. Trees were downed in DeSoto County. Flash Flood Warnings were also issued for the eastern MWN coverage area on the 12th.
MWN StormView Radar on September 2 as a rotating cell moved through Crittenden County, AR.
Memphis International Airport, Memphis, TN
Average temperature: 74.5 degrees (0.7 degrees below average)
Average high temperature: 82.6 degrees (2.5 degrees below average)
Average low temperature: 66.4 degrees (1.2 degrees above average)
Warmest temperature: 92 degrees (11th)
Coolest temperature: 52 degrees (29th)
Heating Degrees Days: 7 (4 below average)
Cooling Degree Days: 302 (14 below average)
Records set or tied: None
Monthly total: 1.58″ (1.51″ below average)
Days with measurable precipitation: 7 (0.3 days below average)
Wettest 24-hour period: 0.62″ (23rd)
Records set or tied: None
Peak wind: East/32 mph (19th)
Average wind: 7.6 mph
Average relative humidity: 71%
Average sky cover: 50%
Cirrus Weather Solutions / MemphisWeather.net, Bartlett, TN
Average temperature: 71.9 degrees
Average high temperature: 81.8 degrees
Average low temperature: 63.8 degrees
Warmest temperature: 93.2 degrees (7th)
Coolest temperature: 49.6 degrees (29th)
Monthly total: 2.88″ (automated rain gauge), 2.68″(manual CoCoRaHS rain gauge)
Days with measurable precipitation: 7
Wettest date: 1.11″ (12th) (via automated gauge)
Peak wind: Northeast/20 mph (19th)
Average relative humidity: 83%
Click here for a daily statistical recap for Bartlett, TN.
MWN Forecast Accuracy
MWN average temperature error: 2.19 degrees
MWN forecast temperatures within 2 degrees of actual: 62%
MWN average dewpoint error: 1.73 degrees
MWN forecast dewpoints within 2 degrees of actual: 74%
Climate Outlook – October 2020
The October climate outlook for the United States from the Climate Prediction Center is shown below. Above average temperatures are forecast for much of the United States, with highest probabilities in the Northeast and Southwest U.S. Odds favor above average temperatures for Memphis, where the average temperature for October is 64.1 degrees.