September Weather Summary

...WILLISTON...

...SEPTEMBER 2009 WAS WARMEST ON RECORD AND DRIER THAN NORMAL...

THE AVERAGE TEMPERATURE FOR SEPTEMBER WAS 64.3 DEGREES WHICH IS 8.2
DEGREES ABOVE THE NORMAL OF 56.1 DEGREES. THE AVERAGE MONTHLY
TEMPERATURE OF 64.3 WAS THE WARMEST AVERAGE MONTHLY TEMPERATURE AT
WILLISTON. THE PREVIOUS WARMEST SEPTEMBER OCCURED IN 1897 WITH A
MONTLY AVERAGE OF 64.0 DEGREES. THE HIGHEST TEMPERATURE WAS 94
DEGREES REACHED ON THE 6TH. THE LOWEST TEMPERATURE FOR THE MONTH WAS
31 DEGREES ON THE 22ND. THE 93 DEGREES THAT OCCURRED ON THE 19TH
TIED THE RECORD FOR THAT DATE ORIGINALLY SET IN 1981.
 
SEPTEMBER 2009 WAS MUCH DRIER THAN NORMAL WITH A TOTAL OF 0.37 INCHES
OF PRECIPITATION FALLING FOR THE MONTH. THIS WAS 0.98 INCHES BELOW
THE NORMAL OF 1.35  INCHES...AND MADE SEPTEMBER 2009 THE 25TH DRIEST
SEPTEMBER EVER. THE GREATEST AMOUNT OF PRECIPITATION DURING A 24
HOUR PERIOD OCCURRED ON THE 7TH THROUGH THE 8TH WHEN 0.23 INCHES OF
RAIN FELL. THERE WERE NO PRECIPITATION RECORDS SET FOR THE MONTH. NO
SNOW FELL IN SEPTEMBER WHICH WAS 0.3 INCHES BELOW NORMAL. AT LEAST A
TRACE OF PRECIPITATION FELL ON 11 DAYS WITH 0.01 INCHES OR MORE
FALLING ON 7 DAYS AND AT LEAST 0.10 INCHES OR MORE FALLING ON 1 DAY.
LIGHT RAIN OCCURRED ON 8 DAYS. FOG WAS REPORTED ON 4 DAYS. THUNDER
WAS REPORTED ON 2 DAYS.

THE AVERAGE WIND SPEED FOR THE MONTH WAS 8.0 MPH. THE WINDIEST DAY
FOR THE MONTH WAS THE 27TH WITH AN AVERAGE WIND SPEED OF 23.4 MPH. ON
THE 27TH A MAX SUSTAINED WIND SPEED OF 38 MPH FROM THE NORTHWEST WAS
REPORTED. A PEAK GUST OF 51 MPH FROM THE NORTHWEST ALSO OCCURRED ON
THE 27TH. THERE WERE 91 HEATING DEGREE DAYS FOR THE MONTH WHICH WAS
183 BELOW THE NORMAL OF 274. THE SEASONAL HEATING DEGREE DAY TOTAL
FOR THE YEAR IS 202 WHICH IS 145 BELOW THE NORMAL OF 347. THERE WERE
78 COOLING DEGREE DAYS FOR THE MONTH WHICH IS 55 DEGREES ABOVE
NORMAL. THE SEASONAL COOLING DEGREE DAY TOTAL FOR THE YEAR IS 296
WHICH IS 167 DEGREES BELOW THE NORMAL OF 463. WILLISTON RECORDED A
TOTAL OF 18305 MINUTES OF SUNSHINE WHICH WAS 81 PERCENT OF THE 22583
MINUTES THAT WERE POSSIBLE. THE HIGHEST BAROMETRIC PRESSURE FOR THE
MONTH WAS 30.33 INCHES ON THE 22ND AND THE LOWEST PRESSURE WAS 29.44
INCHES RECORDED ON THE 30TH.

THE OUTLOOK FOR OCTOBER...NORMAL HIGHS FOR THE MONTH START OUT IN
THE MID 60S AND FALL TO THE UPPER 40S BY MONTHS END. NORMAL LOWS
BEGIN IN THE MID 30S AND FALL TO THE LOWER 20S BY THE END OF THE
MONTH. NORMAL PRECIPITATION IS 0.87 INCHES. NEAR NORMAL TEMPERATURES
AND PRECIPITATION ARE EXPECTED IN OCTOBER.

...BISMARCK...
SEPTEMBER 2009 IN BISMARCK WAS THE SECOND WARMEST SEPTEMBER ON 
RECORD WITH THE AVERAGE MONTHLY TEMPERATURE OF 65.0 DEGREES,
WHICH IS 7.3 DEGREES ABOVE THE 30 YEAR AVERAGE. THIS IS THE FIRST
MONTH SINCE NOVEMBER 2008 THAT HAS HAD AN ABOVE AVERAGE MEAN
MONTHLY TEMPERATURE. THE PREVIOUS 9 SUCCESSIVE MONTHS HAD BELOW
AVERAGE MEAN MONTHLY TEMPERATURES. NO DAILY TEMPERATURE RECORDS
WERE EITHER TIED OR BROKEN DURING THE MONTH.

TOTAL MONTHLY PRECIPITATION FOR SEPTEMBER 2009 WAS 1.24 INCHES WHICH
IS 0.37 INCHES BELOW THE 30 YEAR AVERAGE. NO DAILY PRECIPITATION
RECORDS WERE EITHER TIED OR BROKEN AND NO SNOW FELL DURING THE MONTH.



Return to News Archive

USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.