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000
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
..............................................................

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.

$$