Climatological Report (Monthly)
Issued by NWS Eureka, CA

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000
CXUS56 KEKA 012039
CLMEKA

CLIMATE REPORT
NATIONAL WEATHER SERVICE EUREKA CA
139 PM PDT THU JUN 1 2017

...................................

...THE EUREKA CA CLIMATE SUMMARY FOR THE MONTH OF MAY 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1886 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
RECORD
 HIGH              84   05/13/1939
 LOW               35   05/06/2010
                        05/08/2002
                        05/01/1887
HIGHEST            64   05/31                MM
LOWEST             42   05/17                MM
                        05/14
                        05/08
AVG. MAXIMUM     58.4                      -1.7
AVG. MINIMUM     48.2                       0.7
MEAN             53.3                      -0.5

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         7.20   1889
 MINIMUM         0.03   1955
TOTALS           1.31              1.78   -0.47
DAYS >= .01         6               9.1    -3.1        8
DAYS >= .10         4               4.6    -0.6        2
DAYS >= .50         1               1.1    -0.1        0
DAYS >= 1.00        0               0.1    -0.1        0
GREATEST
 24 HR. TOTAL    0.57   05/16 TO 05/16

SNOWFALL (INCHES)
 LIQUID 7/1        MM                        MM

DEGREE_DAYS
HEATING TOTAL     360               347      13      294
 SINCE 7/1       4060              4168    -108     3403
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0        0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.5
HIGHEST WIND SPEED/DIRECTION    29/020    DATE  05/06
HIGHEST GUST SPEED/DIRECTION    40/360    DATE  05/06

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            5
NUMBER OF DAYS PC              9
NUMBER OF DAYS CLOUDY         17


WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     HEAVY RAIN                 0
RAIN                      2     LIGHT RAIN                11
HAIL                      0     SLEET                      0
FOG                      14     FOG W/VIS <= 1/4 MILE      2
HAZE                      6

-  INDICATES NEGATIVE NUMBERS.
R  INDICATE, RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

&&

TOTAL RAINFALL...............  1.31 DEPARTURE FROM NORMAL.....- 0.47
TOTAL SINCE JANUARY 1ST...... 36.35 DEPARTURE FROM NORMAL.....+13.82
TOTAL SINCE OCT 1ST.......... 62.12 DEPARTURE FROM NORMAL.....+23.62

HIGHEST SLP......... 30.24 ON  1 LOWEST SLP........29.75 ON 25

...REMARKS...HIGH PRESSURE WAS THE DOMINANT WEATHER PATTERN ACROSS
THE AREA THIS MONTH. THIS KEPT RAINFALL SLIGHTLY BELOW NORMAL WITH
ONLY 75% OF THE NORMAL RAINFALL. THIS KEPT THE MARINE CLOUDS IN
PLACE WITH MORE THAN HALF OF THE DAYS BEING REPORTED AS CLOUDY AND
FOGGY AT THE COAST. THE AVERAGE HIGH TEMPERATURE WAS LESS THAN A
DEGREE ABOVE NORMAL AND THIS WAS LIKELY DUE TO A FEW DAYS OF
OFFSHORE FLOW PUSHING THE MARINE LAYER BACK AND ALLOWING TEMPERATURS
TO WARM ABOVE NORMAL. THE AVERAGE LOW WAS ABOVE NORMAL BY 1.3
DEGREES. THIS WAS LIKELY DUE TO THE INCREASED CLOUD COVER AT NIGHT
KEEPING TEMPERATURES ABOVE NORMAL. NO TEMPERATURE RECORDS WERE SET
THIS MONTH.

$$



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