Climatological Report (Monthly)
Issued by NWS
Issued by NWS
186 CXUS56 KSEW 011031 CLMSEA CLIMATE REPORT NATIONAL WEATHER SERVICE SEATTLE 331 AM PDT TUE OCT 01 2024 ................................... ...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2024... CLIMATE NORMAL PERIOD 1991 TO 2020 CLIMATE RECORD PERIOD 1945 TO 2024 WEATHER OBSERVED NORMAL DEPART LAST YEAR`S VALUE DATE(S) VALUE FROM VALUE DATE(S) NORMAL ................................................................ TEMPERATURE (F) RECORD HIGH 98 09/02/1988 LOW 35 09/27/1972 HIGHEST 90 09/05 MM MM 87 09/02 LOWEST 47 09/21 MM MM 46 09/29 AVG. MAXIMUM 70.5 71.6 -1.1 70.6 AVG. MINIMUM 54.7 53.6 1.1 53.4 MEAN 62.6 62.6 -0.0 62.0 DAYS MAX >= 90 1 0.2 0.8 0 DAYS MAX <= 32 0 0.0 0.0 0 DAYS MIN <= 32 0 0.0 0.0 0 DAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 6.17 2013 MINIMUM T 1991 TOTALS 0.62 1.61 -0.99 3.44 DAILY AVG. 0.02 0.05 -0.03 0.11 DAYS >= .01 8 8.3 -0.3 11 DAYS >= .10 2 4.2 -2.2 8 DAYS >= .50 0 0.9 -0.9 3 DAYS >= 1.00 0 0.2 -0.2 0 GREATEST 24 HR. TOTAL 0.24 09/11 TO 09/11 DEGREE DAYS HEATING TOTAL 106 102 4 108 SINCE 7/1 144 158 -14 MM COOLING TOTAL 42 30 12 26 SINCE 1/1 315 263 52 MM ................................................................ WIND (MPH) AVERAGE WIND SPEED 6.2 HIGHEST WIND SPEED/DIRECTION 20/220 DATE 09/25 HIGHEST GUST SPEED/DIRECTION 29/200 DATE 09/25 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.63 NUMBER OF DAYS FAIR 4 NUMBER OF DAYS PC 15 NUMBER OF DAYS CLOUDY 11 AVERAGE RH (PERCENT) 73 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 0 MIXED PRECIP 0 HEAVY RAIN 0 RAIN 1 LIGHT RAIN 15 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 16 FOG W/VIS <= 1/4 MILE 2 HAZE 4 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. $$