Climatological Report (Monthly)
Issued by NWS Sterling, VA

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000 CXUS51 KLWX 010925 CLMDCA CLIMATE REPORT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 525 AM EDT WED NOV 1 2017 ................................... ...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2017... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1871 TO 2017 WEATHER OBSERVED NORMAL DEPART LAST YEAR`S VALUE DATE(S) VALUE FROM VALUE NORMAL ............................................................. TEMPERATURE (F) RECORD HIGH 96 10/05/1941 LOW 26 10/31/1917 10/31/1893 10/30/1873 HIGHEST 86 10/10 84 2 10/09 LOWEST 43 10/27 37 6 AVG. MAXIMUM 73.6 68.4 5.2 MM AVG. MINIMUM 56.2 50.6 5.6 MM MEAN 64.9 59.5 5.4 DAYS MAX >= 90 0 0.1 -0.1 DAYS MAX <= 32 0 0.0 0.0 DAYS MIN <= 32 0 0.0 0.0 DAYS MIN <= 0 0 0.0 0.0 PRECIPITATION (INCHES) RECORD MAXIMUM 9.41 2005 MINIMUM T 1963 TOTALS 2.02 3.40 -1.38 MM DAILY AVG. 0.07 0.11 -0.04 DAYS >= .01 9 7.7 1.3 DAYS >= .10 4 4.8 -0.8 DAYS >= .50 2 2.5 -0.5 DAYS >= 1.00 0 1.0 -1.0 GREATEST 24 HR. TOTAL 0.97 10/29 TO 10/29 SNOWFALL (INCHES) RECORDS TOTAL 2.2 1925 TOTALS 0.0 0.0 0.0 SINCE 7/1 0.0 0.0 0.0 SNOWDEPTH AVG. 0 DAYS >= TRACE 0 0.0 0.0 DAYS >= 1.0 0 0.0 0.0 GREATEST SNOW DEPTH 0 MM 24 HR TOTAL 0.0 DEGREE_DAYS HEATING TOTAL 87 205 -118 MM SINCE 7/1 93 229 -136 MM COOLING TOTAL 91 34 57 MM SINCE 1/1 1823 1547 276 MM .............................................................. WIND (MPH) AVERAGE WIND SPEED 8.1 HIGHEST WIND SPEED/DIRECTION 35/320 DATE 10/29 HIGHEST GUST SPEED/DIRECTION 47/320 DATE 10/29 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.50 NUMBER OF DAYS FAIR 10 NUMBER OF DAYS PC 13 NUMBER OF DAYS CLOUDY 8 AVERAGE RH (PERCENT) 70 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 2 MIXED PRECIP 0 HEAVY RAIN 3 RAIN 4 LIGHT RAIN 11 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 10 FOG W/VIS <= 1/4 MILE 1 HAZE 3 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && WASHINGTON DC...RONALD REAGAN WASHINGTON NATIONAL AIRPORT... THE MONTHLY AVERAGE TEMPERATURE RANKED AS THE 3RD WARMEST ON RECORD. MONTHLY PRECIPITATION WAS BELOW NORMAL. THE LOW TEMPERATURE ON THE 8TH ONLY DROPPED TO 75 DEGREES. THIS IS THE WARMEST LOW TEMPERATURE EVER RECORDED FOR THE MONTH OF OCTOBER. THE PREVIOUS RECORD WAS 74 SET ON OCTOBER 4TH 1941 AND OCTOBER 4TH AND 5TH 1898. THREE DAYS HAD LOW TEMPERATURES IN THE 70S. THIS IS TIED WITH 1959...1954 AND 1898 FOR THE SECOND MOST ON RECORD IN OCTOBER. 1941 HAD 4 DAYS WITH LOW TEMPERATURES IN THE 70S. FOUR DAILY WARM LOW TEMPERATURE RECORDS WERE SET LAST MONTH: A LOW OF 75 DEGREES ON THE 8TH BROKE THE RECORD OF 68 SET IN 2007. A LOW OF 74 DEGREES ON THE 9TH BROKE THE RECORD OF 72 SET IN 1959. A LOW OF 72 DEGREES ON THE 10TH BROKE THE RECORD OF 69 SET IN 1990 AND 1959. A LOW OF 67 DEGREES ON THE 11TH BROKE THE OLD RECORD OF 66 SET IN 1970...1959 AND 1904. CLIMATE RECORDS HAVE BEEN KEPT AT RONALD REAGAN WASHINGTON NATIONAL AIRPORT SINCE AUGUST OF 1941. ADDITIONAL TEMPERATURE RECORDS FOR THE WASHINGTON DC AREA OBSERVED DOWNTOWN EXTEND BACK TO JANUARY OF 1872. PRECIPITATION RECORDS EXTEND BACK TO JANUARY OF 1871. SNOWFALL RECORDS BEGAN IN JANUARY OF 1884. ALL CLIMATE DATA ARE CONSIDERED PRELIMINARY UNTIL REVIEWED BY THE NATIONAL CENTERS FOR ENVIRONMENTAL INFORMATION (NCEI). $$ DH/HTS

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