Friday, October 6, 2017

September 2017 Climate Data for Memphis, TN

September Climate Recap

After a (relatively speaking) cool August, September continued the trend, as the first two weeks (actually 13 days) were the second coolest on record for that time of year. Every day from the 1st through the 14th registered at or below normal in the temperature department. However, it warmed up quickly during the second half of the month. The period September 15-30 saw no days with below normal temperatures and that period ended up 4th warmest on record. It definitely was a Jekyll and Hyde month!

The consistent part of the weather though was dryness. Less than 2" of rain fell during the month, as the remnants of former Hurricane Harvey moved out on August 31 and despite the remnants of former Hurricane Irma moving over on the 12th, resulting in a record cool day (high of 66°). Nearly 80% of the rain for the month (just over 1.25" at Memphis International Airport) fell on that day, otherwise it was a very dry month. There was no severe weather associated with Irma as there was Harvey in late August, and in fact, no severe weather for the month and no warnings issued.

Memphis International Airport, Memphis, TN


Temperature
Average temperature: 75.4 degrees (0.2 degrees above average)
Average high temperature: 84.8 degrees (0.3 degrees below average)
Average low temperature: 65.9 degrees (0.7 degrees above average)
Warmest temperature: 93 degrees (22nd)
Coolest temperature: 55 degrees (7th)
Heating Degrees Days: 3 (8 below average)
Cooling Degree Days: 321 (5 above average)
Records set or tied: Record cool maximum temperature set on the 12th (66 degrees)
Comments: Ten days recorded temperatures at or above 90 degrees. Year to date, the average temperature of 68.3° is tied for the second warmest on record behind 2012.

Precipitation
Monthly total: 1.61" (1.48" below average)
Days with measurable precipitation: 6
Wettest 24-hour period: 1.27" (12th)
Snowfall: None
Records set or tied: None
Comments:  Only one day recorded precipitation of more than one-half inch. Year to date, precipitation has totaled 38.27" or 99.5% of normal (average year-to-date: 38.47").

Miscellaneous
Peak wind: Northwest/22 mph (1st) (lingering effects of Tropical Depression Harvey)
Average wind: 6.2 mph
Average relative humidity: N/A
Average sky cover: N/A

Click here for a daily statistical recap for Memphis International Airport.

Cirrus Weather Solutions / MemphisWeather.net, Bartlett, TN


Temperature
Average temperature: 72.8 degrees
Average high temperature: 85.5 degrees
Average low temperature: 62.0 degrees
Warmest temperature: 93.5 degrees (21st)
Coolest temperature: 49.8 degrees (7th)
Comments: None

Precipitation
Monthly total: 1.45" (automated rain gauge), 1.58" (manual CoCoRaHS rain gauge)
Days with measurable precipitation: 5
Wettest date: 0.98" (12th) (via automated gauge)
Snowfall: None
Comments: None

Miscellaneous
Peak wind: Northwest/17 mph (1st)
Average relative humidity: 80%
Average barometric pressure: 30.01 in. Hg
Comments: None

Click here for a daily statistical recap for Bartlett, TN.

MWN Forecast Accuracy

MWN average temperature error: 1.14 degrees
MWN forecast temperatures within 2 degrees of actual: 87%
MWN average dewpoint error: 1.70 degrees
MWN forecast dewpoints within 2 degrees of actual: 77%

MWN's forecasts extend out five periods (2.5 days, or roughly 60 hours). Historical accuracy statistics can be found here.

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