Climatological Report (Monthly)
Issued by NWS Duluth, MN

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CXUS53 KDLH 021312
CLMDLH


CLIMATE REPORT
NATIONAL WEATHER SERVICE DULUTH MN
711 AM CST TUE JAN 2 2018

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

...THE DULUTH CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1870 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              56   12/06/1939
 LOW              -35   12/28/1917
HIGHEST            43   12/02        MM      MM       39  12/22
LOWEST            -26   12/31        MM      MM      -21  12/18
AVG. MAXIMUM     17.2              22.3    -5.1     22.3
AVG. MINIMUM      3.8               7.3    -3.5      9.5
MEAN             10.5              14.8    -4.3     15.9
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     26              24.5     1.5       21
DAYS MIN <= 32     31              30.5     0.5       31
DAYS MIN <= 0       9              10.3    -1.3        9

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.89   1879
 MINIMUM         0.07   1905
TOTALS           0.83              1.21   -0.38     2.07
DAILY AVG.       0.03              0.04   -0.01     0.07
DAYS >= .01        14              10.5     3.5       15
DAYS >= .10         2               3.5    -1.5        5
DAYS >= .50         0               0.5    -0.5        1
DAYS >= 1.00        0               0.1    -0.1        0
GREATEST
 24 HR. TOTAL    0.23   12/12 TO 12/13

SNOWFALL (INCHES)
RECORDS
 TOTAL           44.3   5
                        0
                        -26215
TOTALS           13.4              17.7    -4.3     21.3
SINCE 7/1        35.0              33.8     1.2     29.4
SNOWDEPTH AVG.      3                 8      -5        4
DAYS >= 1.0         5               5.0     0.0        6
GREATEST
 SNOW DEPTH         5   12/31                          9  12/12
                        12/30
                        12/29
 24 HR TOTAL      2.7   12/12 TO 12/13

DEGREE_DAYS
HEATING TOTAL    1683              1556     127     1512
 SINCE 7/1       3829              3769      60     2994
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        126               204     -78      281
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              10.6
HIGHEST WIND SPEED/DIRECTION    36/300    DATE  12/05
HIGHEST GUST SPEED/DIRECTION    47/300    DATE  12/05

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            7
NUMBER OF DAYS PC              9
NUMBER OF DAYS CLOUDY         15

AVERAGE RH (PERCENT)     80

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                1     FREEZING RAIN              0
LT FREEZING RAIN          3     HAIL                       0
HEAVY SNOW                0     SNOW                       3
LIGHT SNOW               23     SLEET                      0
FOG                      22     FOG W/VIS <= 1/4 MILE      2
HAZE                      7

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

.DECEMBER 2017 WAS COLDER THAN NORMAL WITH BELOW NORMAL
PRECIPITATION AT DULUTH MN...

THE AVERAGE TEMPERATURE FOR DECEMBER WAS 10.5 DEGREES WHICH WAS 4.3
DEGREES BELOW THE NORMAL OF 14.8 DEGREES. THE HIGHEST TEMPERATURE
FOR THE MONTH WAS 43 DEGREES ON THE 2ND. THE LOWEST TEMPERATURE WAS
26 DEGREES BELOW ZERO ON THE 31ST. NO DAILY TEMPERATURE RECORDS WERE
BROKEN FOR THE MONTH. 18 DAYS HAD AVERAGE TEMPERATURES BELOW NORMAL.

DECEMBER 2017 WAS BELOW NORMAL FOR PRECIPITATION WITH A TOTAL OF
0.83 INCHES OF PRECIPITATION RECORDED FOR THE MONTH. THIS WAS 0.38
INCHES BELOW THE NORMAL OF 1.21 INCHES. THE GREATEST AMOUNT OF
PRECIPITATION IN A 24 HOUR PERIOD OCCURRED ON THE 12TH TO THE 13TH
WHEN 0.23 INCHES WAS RECORDED. AT LEAST A TRACE OF PRECIPITATION WAS
RECORDED ON 27 DAYS. AT LEAST 0.01 INCHES OF PRECIPITATION FELL ON
14 DAYS. AT LEAST 0.10 INCHES FELL ON 2 DAYS. NO DAILY PRECIPITATION
RECORDS WERE BROKEN FOR THE MONTH.

DECEMBER 2017 WAS BELOW NORMAL FOR SNOWFALL WITH A TOTAL OF 13.4
INCHES OF SNOW FOR THE MONTH. THIS WAS 4.3 INCHES BELOW THE NORMAL
OF 17.7 INCHES. THE GREATEST AMOUNT OF SNOWFALL IN A 24 HOUR PERIOD
OCCURRED ON THE 12TH TO THE 13TH WHEN 2.7 INCHES WAS RECORDED. NO
DAILY SNOWFALL RECORDS WERE BROKEN FOR THE MONTH.

THE AVERAGE WIND SPEED FOR THE MONTH WAS 10.6 MPH. THE WINDIEST DAY
OF THE MONTH WAS ON THE 5TH WITH AN AVERAGE WIND OF 24.0 MPH. THE
HIGHEST SUSTAINED WIND OCCURRED ON THE 5TH WITH A SPEED OF 36 MPH
OUT OF THE WEST NORTHWEST. A PEAK WIND GUST OF 47 MPH OUT OF THE
WEST NORTHWEST WAS ALSO RECORDED ON THE 5TH.

THERE WERE 1683 HEATING DEGREE DAYS FOR THE MONTH WHICH WAS 127
ABOVE THE NORMAL OF 1556. THIS BROUGHT THE SEASONAL TOTAL TO 2737
WHICH WAS X BELOW THE NORMAL OF 3769. THERE WERE 0 COOLING DEGREE
DAYS FOR THE MONTH WHICH WAS NORMAL. THE SEASONAL TOTAL COOLING
DEGREE DAYS STANDS AT 126 WHICH WAS 78 BELOW THE NORMAL OF 204. THE
HIGHEST SEA LEVEL PRESSURE FOR THE MONTH WAS 30.79 INCHES REACHED ON
THE 27TH AND THE LOWEST SEA LEVEL PRESSURE READING WAS 29.22 INCHES
REACHED ON THE 4TH.

THE OUTLOOK FOR JANUARY...NORMAL HIGHS ARE IN THE UPPER TEENS AND
LOW 20S. NORMAL LOWS FOR THE MONTH ARE IN THE SINGLE DIGITS ABOVE
ZERO. NORMAL PRECIPITATION FOR JANUARY IS 0.96 INCHES. NORMAL
SNOWFALL FOR JANUARY IS 19.4 INCHES. THE LATEST CLIMATE PREDICTION
CENTER OUTLOOK INDICATES THAT THERE IS A 40% CHANCE FOR BELOW NORMAL
TEMPERATURES AND A 33% CHANCE FOR BELOW NORMAL PRECIPICATION.

$$



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