Climatological Report (Monthly)
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CXUS53 KGRR 021722 CCA
CLMBIV

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

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

...THE HOLLAND/TULIP CITY MI CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1996 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
HIGHEST            54   12/26        MM      MM       62  12/23
                                                          12/13
LOWEST              7   12/19        MM      MM       24  12/20
AVG. MAXIMUM     33.8              36.5    -2.7     45.8
AVG. MINIMUM     24.6              26.1    -1.5     34.2
MEAN             29.2              31.3    -2.1     40.0
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     12               9.2     2.8        1
DAYS MIN <= 32     26              23.7     2.3       14
DAYS MIN <= 0       0               0.1    -0.1        0

PRECIPITATION (INCHES)
TOTALS           1.75              2.30   -0.55     3.58
DAILY AVG.       0.06              0.07   -0.01     0.12
DAYS >= .01        17                MM      MM       15
DAYS >= .10         6                MM      MM        7
DAYS >= .50         0                MM      MM        3
DAYS >= 1.00        0                MM      MM        0
GREATEST
 24 HR. TOTAL    0.45   12/04 TO 12/05

DEGREE_DAYS
HEATING TOTAL    1102              1045      57      768
 SINCE 7/1       2000              2268    -268     1798
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        785               693      92      601
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              11.8
RESULTANT WIND SPEED/DIRECTION   7/246
HIGHEST WIND SPEED/DIRECTION    38/240    DATE  12/20
HIGHEST GUST SPEED/DIRECTION    49/240    DATE  12/20

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            1
NUMBER OF DAYS PC              8
NUMBER OF DAYS CLOUDY         22

AVERAGE RH (PERCENT)     75

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       2
LIGHT RAIN                6     FREEZING RAIN              0
LT FREEZING RAIN          1     HAIL                       0
HEAVY SNOW                0     SNOW                       3
LIGHT SNOW               18     SLEET                      0
FOG                      18     FOG W/VIS <= 1/4 MILE      0
HAZE                      6

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

&&

NOTE... PRECIPITATION AMOUNTS DURING HEAVY SNOW ARE
UNDERREPRESENTED BY THE HOLLAND ASOS.

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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