Washington, DC Climate in September

Temperature for September

In Washington, DC during September the average high temperature is 80.7°F. The hottest day on record was September 2, 1953 when the temperature hit 101.3°F.

Washington, DC daily average and extreme temperature range for September

Low Temperature

During September the overnight temperature drops to an average of 62.3°F, with the lowest temperature of 39.4°F being recorded on September 27, 1940. In September it has never frozen overnight.

Precipitation for September

In September the average monthly rainfall in Washington, DC is 2.18 inches with rain usually falling on between 9 and 10 days. 1937 was the driest September with only 0.00 inches of rain falling, and 1975 was the wettest September with 10.29 inches of rain. The wettest single day in September was 27 September 1985 when 3.96 inches of rain fell.

In September it usually snows on between 0 and 1 days. Tornados are reported on 0 and 1 days in September. There are thunderstorms on between 2 and 3 days in September.

  BENCHMARKS  
Loading Time: Base Classes  0.0071
Controller Execution Time ( Climate / Summary )  0.0881
Total Execution Time  0.0953
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  URI STRING  
climate/summary/united-states/district-of-columbia/ronald-reagan-washington-natl/september
  CLASS/METHOD  
climate/summary
  DATABASE:  xrssweather0-climatespy   QUERIES: 11  (Hide)
0.0007   SELECT `locationId`, `cityName`, `urlName`, `urlState`, `stateName`, `stateCode`, `StationName`, `countryName`, `urlCountry`, `dd1`.`year` as earliestYear, `dd1`.`monthNo` as earliestMonth, `dd1`.`dayNo` as earliestDay, `dd2`.`year` as latestYear, `dd2`.`monthNo` as latestMonth, `dd2`.`dayNo` as latestDay
FROM 
(`dimLocation`)
JOIN `dimDatedd1 ON `dimLocation`.`beginDateId` = `dd1`.`dateId`
JOIN `dimDatedd2 ON `dimLocation`.`endDateId` = `dd2`.`dateId`
WHERE `urlState` =  'district-of-columbia'
AND `urlName` =  'ronald-reagan-washington-natl'
LIMIT 1 
0.0008   SELECT `monthNo`, AVG(`meanMinTemp`) AS meanMinTempAVG(`meanMaxTemp`) AS meanMaxTemp
FROM 
(`aggMonthly`)
WHERE `monthNo` =  9
AND `locationId` =  '2892'
GROUP BY `monthNo
0.0008   SELECT `monthNo`, AVG(`meanMinTemp`) AS meanMinTempAVG(`meanMaxTemp`) AS meanMaxTemp
FROM 
(`aggMonthly`)
WHERE `monthNo` =  9
AND `locationId` =  '2892'
GROUP BY `monthNo
0.0023   SELECT `maxTemp`, `monthName`, `dayNo`, `dimDate`.`year`, `dimLocation`.`locationId`, `dimLocation`.`countryName`, `dimLocation`.`stateName`, `dimLocation`.`presentationName`, `dimLocation`.`urlCountry`, `dimLocation`.`urlState`, `dimLocation`.`urlName`
FROM (`aggMonthly`)
JOIN `dimLocationON `dimLocation`.`locationId` = `aggMonthly`.`locationId`
JOIN `dimDateON `dimDate`.`dateId` = `aggMonthly`.`maxTempDate`
WHERE `aggMonthly`.`locationId` =  '2892'
AND `dimDate`.`monthNo` =  9
ORDER BY 
`maxTempdesc
LIMIT 1 
0.0048   SELECT `minTemp`, `monthName`, `dayNo`, `dimDate`.`year`, `dimLocation`.`locationId`, `dimLocation`.`countryName`, `dimLocation`.`stateName`, `dimLocation`.`presentationName`, `dimLocation`.`urlCountry`, `dimLocation`.`urlState`, `dimLocation`.`urlName`
FROM (`aggMonthly`)
JOIN `dimLocationON `dimLocation`.`locationId` = `aggMonthly`.`locationId`
JOIN `dimDateON `dimDate`.`dateId` = `aggMonthly`.`minTempDate`
WHERE `aggMonthly`.`locationId` =  '2892'
AND `dimDate`.`monthNo` =  9
ORDER BY 
`minTempasc
LIMIT 1 
0.0240   select min(count_days) as min_daysavg(count_days) as average_daysmax(count_days) as max_days  from (select yearcount(*) as count_days from factDaily fd  join dimDate dd on (dd.dateId fd.DateId) where fd.locationId 2892 and minTemp <= 32  and dd.monthNo 9 group by year) as count_freezing 
0.0241   select min(count_days) as min_daysavg(count_days) as average_daysmax(count_days) as max_days  from (select yearcount(*) as count_days from factDaily fd  join dimDate dd on (dd.dateId fd.DateId) where fd.locationId 2892 and maxTemp <= 32  and dd.monthNo 9 group by year) as count_freezing 
0.0009   SELECT AVG(`sumRainfall`) AS sumRainfallAVG(`daysRainfall`) AS daysRainfallAVG(`daysSnow`) AS daysSnowAVG(`daysTornado`) AS daysTornadoAVG(`daysThunder`) AS daysThunder, `monthNo`
FROM (`aggMonthly`)
WHERE `monthNo` =  9
AND `locationId` =  '2892'
GROUP BY `monthNo
0.0008   SELECT `sumRainfall`, `daysRainfall`, `year`
FROM (`aggMonthly`)
WHERE `monthNo` =  9
AND `locationId` =  '2892'
ORDER BY `sumRainfallasc
LIMIT 1 
0.0008   SELECT `sumRainfall`, `daysRainfall`, `year`
FROM (`aggMonthly`)
WHERE `monthNo` =  9
AND `locationId` =  '2892'
ORDER BY `sumRainfalldesc
LIMIT 1 
0.0022   SELECT `maxRainfall`, `monthName`, `dayNo`, `dimDate`.`year`, `dimLocation`.`locationId`, `dimLocation`.`countryName`, `dimLocation`.`stateName`, `dimLocation`.`presentationName`, `dimLocation`.`urlCountry`, `dimLocation`.`urlState`, `dimLocation`.`urlName`
FROM (`aggMonthly`)
JOIN `dimLocationON `dimLocation`.`locationId` = `aggMonthly`.`locationId`
JOIN `dimDateON `dimDate`.`dateId` = `aggMonthly`.`maxRainfallDate`
WHERE `aggMonthly`.`locationId` =  '2892'
AND `dimDate`.`monthNo` =  9
ORDER BY 
`maxRainfalldesc
LIMIT 1 
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