Climatological Report (Monthly)
Issued by NWS Grand Rapids, MI

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000
CXUS53 KGRR 021716 CCA
CLMGRR

CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAND RAPIDS, MI
916 AM EST SUN JAN 1 2017

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

...THE GRAND RAPIDS MI (ASOS) CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1892 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              69   12/05/2001
 LOW              -18   12/19/1983
HIGHEST            53   12/26        53       0       61  12/13
LOWEST              4   12/15         1       3       21  12/20
AVG. MAXIMUM     32.1              34.8    -2.7     45.2
AVG. MINIMUM     23.0              23.5    -0.5     33.1
MEAN             27.5              29.2    -1.7     39.1
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     14              11.7     2.3        3
DAYS MIN <= 32     26              25.0     1.0       15
DAYS MIN <= 0       0               0.7    -0.7        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         6.95   1893
 MINIMUM         0.31   1913
TOTALS           2.96              2.50    0.46     3.33
DAILY AVG.       0.10              0.08    0.02     0.11
DAYS >= .01        20              16.0     4.0       16
DAYS >= .10        11               6.9     4.1        5
DAYS >= .50         1               1.1    -0.1        2
DAYS >= 1.00        0               0.3    -0.3        0
GREATEST
 24 HR. TOTAL    0.76   12/11 TO 12/11

SNOWFALL (INCHES)
RECORDS
 TOTAL           59.2   2000
 24 HR TOTAL     15.1   12/10/1970 TO 12/11/1970
 SNOW DEPTH        22   12/27/1951
                        12/26/1951
                        12/25/1951
TOTALS           37.0              21.9    15.1      2.5
SINCE 7/1        37.8              29.2     8.6      6.0
SNOWDEPTH AVG.      4                 3       1        0
DAYS >= TRACE      23              13.3     9.7        8
DAYS >= 1.0        11               6.6     4.4        1
GREATEST
 SNOW DEPTH         9   12/19                          2  12/31
                        12/17
                        12/12
 24 HR TOTAL      8.9   12/11 TO 12/11

DEGREE_DAYS
HEATING TOTAL    1156              1111      45      797
 SINCE 7/1       2104              2449    -345     1855
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        936               699     237      642

FREEZE DATES
RECORD
 EARLIEST     09/03/1946
 LATEST       06/04/1945
EARLIEST                        10/13
LATEST                          05/02
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              11.4
RESULTANT WIND SPEED/DIRECTION   7/240
HIGHEST WIND SPEED/DIRECTION    37/240    DATE  12/20
HIGHEST GUST SPEED/DIRECTION    45/230    DATE  12/20

SKY COVER
POSSIBLE SUNSHINE (PERCENT)    9
AVERAGE SKY COVER           0.90
NUMBER OF DAYS FAIR            1
NUMBER OF DAYS PC              6
NUMBER OF DAYS CLOUDY         24

AVERAGE RH (PERCENT)     75

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               1
HEAVY RAIN                0     RAIN                       2
LIGHT RAIN                5     FREEZING RAIN              0
LT FREEZING RAIN          2     HAIL                       0
HEAVY SNOW                3     SNOW                      13
LIGHT SNOW               23     SLEET                      0
FOG                      22     FOG W/VIS <= 1/4 MILE      4
HAZE                     16

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

&&

DECEMBER 2016 FEATURED A VARIETY OF WEATHER DURING THE MONTH AND
ACROSS THE AREA OF CENTRAL TO SOUTHWEST LOWER MICHIGAN. AVERAGED
OUT... THE MONTH WAS NEAR TO A LITTLE BELOW NORMAL IN TERMS OF
TEMPERATURE... THE COOLEST MONTH RELATIVE TO NORMAL SINCE APRIL.
LIQUID/MELTED PRECIPITATION WAS NEAR TO A LITTLE BELOW NORMAL... AND
SNOW TOTALS RANGED FROM A LITTLE BELOW TO WELL ABOVE NORMAL. DIRECT
SUNSHINE WAS MEASURED AT 9 PERCENT OF POSSIBLE IN GRAND RAPIDS...
BELOW THE DECEMBER AVERAGE OF 20 PERCENT AND ONLY SLIGHTLY SUNNIER
THAN SOME OF THE CLOUDIEST MONTHS ON RECORD.

THE FIRST WEEK OF THE MONTH HAD SLIGHTLY WARMER THAN NORMAL
TEMPERATURES AND PRODUCED SNOW ACCUMULATIONS BETWEEN 1 AND 5 INCHES
ON DECEMBER 4TH. FOR MANY IN SOUTHWEST MICHIGAN IT WAS THE FIRST
SUBSTANTIAL ACCUMULATION OF THE COLD SEASON.

STARTING THE SECOND WEEK OF THE MONTH... ARCTIC AIR MASSES PLUNGED
INTO THE REGION AND REMAINED UNTIL DECEMBER 20TH. CERTAINLY THE
COLDEST DECEMBER AIR SINCE 2013 BUT BY SOME MEASURES SINCE 2004...
HIGH TEMPERATURES AWAY FROM LAKE MICHIGAN TOPPED OUT IN THE TEENS
FOR A FEW OF THOSE DAYS... AND LOWS OCCASIONALLY DIPPED NEAR TO
BELOW ZERO. COUPLED WITH THE WARMEST LAKE MICHIGAN WATER
TEMPERATURES ON RECORD SINCE THE 1980S... LAKE EFFECT SNOW WAS
COMMON FOR THOSE TWO WEEKS... THOUGH THE GREATEST AMOUNTS SKIPPED
OVER MUSKEGON AND FELL A BIT FARTHER INLAND. A LOW PRESSURE SYSTEM
THAT TAPPED INTO SOUTHERN U.S. MOISTURE ALSO PRODUCED 5 TO 10 INCHES
OF SNOW ACROSS THE WHOLE AREA ON DECEMBER 11TH.

RELATIVELY MILD AIR REPLACED THE SHARP COLD AFTER THE 20TH. RAIN AND
ISOLATED THUNDERSTORMS LATE ON THE 25TH INTO THE 26TH... PLUS RECORD
WARM TEMPERATURES IN THE 50S ON THE 26TH... MELTED MOST OF THE
AREA`S SNOWPACK. DESPITE THE SOMEWHAT WARMER THAN NORMAL AIR AT THE
END OF THE MONTH... LAKE EFFECT SNOW FOCUSED ON SOUTHWEST MICHIGAN
ON THE 29TH DROPPED 4 TO 6 INCHES BETWEEN SOUTH HAVEN AND KALAMAZOO.

$$

CAS



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