Climatological Report (Monthly)
Issued by NWS
Issued by NWS
000 CXUS56 KSEW 011050 CLMSEA CLIMATE REPORT NATIONAL WEATHER SERVICE SEATTLE 350 AM PDT SUN OCT 01 2023 ................................... ...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2023... CLIMATE NORMAL PERIOD 1991 TO 2020 CLIMATE RECORD PERIOD 1945 TO 2023 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 87 09/02 MM MM 92 09/10 LOWEST 46 09/29 MM MM 49 09/19 AVG. MAXIMUM 70.6 71.6 -1.0 74.6 AVG. MINIMUM 53.4 53.6 -0.2 55.1 MEAN 62.0 62.6 -0.6 64.8 DAYS MAX >= 90 0 0.2 -0.2 1 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 3.44 1.61 1.83 0.25 DAILY AVG. 0.11 0.05 0.06 0.01 DAYS >= .01 11 8.3 2.7 4 DAYS >= .10 8 4.2 3.8 1 DAYS >= .50 3 0.9 2.1 0 DAYS >= 1.00 0 0.2 -0.2 0 GREATEST 24 HR. TOTAL 1.14 09/24 TO 09/25 DEGREE DAYS HEATING TOTAL 108 102 6 35 SINCE 7/1 120 158 -38 MM COOLING TOTAL 26 30 -4 37 SINCE 1/1 378 263 115 MM ................................................................ WIND (MPH) AVERAGE WIND SPEED 6.9 HIGHEST WIND SPEED/DIRECTION 22/220 DATE 09/27 HIGHEST GUST SPEED/DIRECTION 32/210 DATE 09/25 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.59 NUMBER OF DAYS FAIR 6 NUMBER OF DAYS PC 13 NUMBER OF DAYS CLOUDY 11 AVERAGE RH (PERCENT) 68 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 2 MIXED PRECIP 0 HEAVY RAIN 2 RAIN 5 LIGHT RAIN 12 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 15 FOG W/VIS <= 1/4 MILE 1 HAZE 4 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. $$