855
CXUS56 KEKA 031244
CLMEKA
SFOCLMEKA 000
TTAA00 EKA 031231
CLIMATE REPORT
NATIONAL WEATHER SERVICE EUREKA CA
527 AM PDT TUE OCT 03 2023
...............................
..THE EUREKA CA CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2023
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1886 TO 2023
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE
NORMAL
..........................................................
TEMPERATURE (F)
RECORD
HIGH 87 09/02/2017
LOW 36 09/22/1895
HIGHEST 70 09/02 MM MM 70
LOWEST 44 09/21 MM MM 49
AVG. MAXIMUM 65.1 63.9 1.2 65.4
AVG. MINIMUM 52.2 50.5 1.7 52.1
MEAN 58.6 57.2 1.4 58.8
DAYS MAX >= 90 0
DAYS MIN <= 32 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 4.26 1901
MINIMUM 0.00 1929
TOTALS 1.83 0.68 1.15
DAYS >= .01 6 4.7 1.3 4
DAYS >= .10 1 1.6 -0.6 1
DAYS >= .50 1 0.2 0.8 0
DAYS >= 1.00 1 0.1 0.9 0
GREATEST
24 HR. TOTAL 1.68 09/25 TO 09/26
LIQUID 7/1 MM MM
DEGREE DAYS
HEATING TOTAL 182 234 -52 179
SINCE 7/1 501 661 -160 MM
COOLING TOTAL 0 0 0 0
SINCE 1/1 0 1 -1 MM
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WIND (MPH)
AVERAGE WIND SPEED 3.5
HIGHEST WIND SPEED/DIRECTION 18/160 DATE 09/25
HIGHEST GUST SPEED/DIRECTION 23/MM DATE 09/20
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.56
NUMBER OF DAYS FAIR 10
NUMBER OF DAYS PC 10
NUMBER OF DAYS CLOUDY 10
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 0 HEAVY RAIN 1
RAIN 0 LIGHT RAIN 8
HAIL 0 SLEET 0
FOG 16 FOG W/VIS <= 1/4 MILE 3
HAZE 7
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
FOLLOWING THE TREND FROM AUGUST, THE FIRST HALF OF SEPTEMBER WAS
VERY TYPICAL FOR THE COAST. MOST DAYS WERE MARKED BY A PRONOUNCED
MARINE LAYER IN THE MORNING CLEARING IN THE AFTERNOON. AS SUCH THE
EARLY PART OF THE MONTH SAW CALM CONDITIONS WITH COOL TEMPERATURES
IN THE MID 60S. A FEW DAYS OF OFFSHORE WIND AROUND SEPTEMBER 20TH
ALLOWED FOR A COUPLE DAYS NEAR 70 AND ALSO BROUGHT SMOKE FORM INLAND
WILDFIRES, GENERATING PERIODS OF BRIEFLY UNHEALTHY AIR QUALITY. SUCH
SMOKE IS UNUSUAL FOR THE USUALLY PROTECTED COAST. THE MONTH ENDED
WITH A BANG AS AN ABNORMALLY STRONG EARLY SEASON ATMOSPHERIC RIVER
MADE LANDFALL ON THE 25TH INTO THE 26TH. THIS EVENT BROUGHT GUSTY
WINDS AND HEAVY RAINFALL MUCH MORE TYPICAL OF NOVEMBER OR DECEMBER.
WITH STORM TOTAL RAINFALL OF 1.63 THIS ONE EVENT PUSHED THE MONTH
WELL ABOVE AVERAGE FOR PRECIPITATION. THE MONTH CLOSED WITH A SERIES
OF SUBSEQUENT WEAK FRONTS BRINGING FURTHER DRIZZLE AND LIGHT RAIN.
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