Climatological Report (Monthly)
Issued by NWS

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CXUS53 KGRR 021719 CCA
CLMAZO

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

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

...THE KALAMAZOO MI CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
HIGHEST            53   12/26        MM      MM       63  12/13
                                                          12/12
LOWEST             -1   12/19        MM      MM       22  12/20
                                                          12/19
AVG. MAXIMUM     32.7              34.8    -2.1     46.2
AVG. MINIMUM     22.3              22.7    -0.4     33.9
MEAN             27.5              28.7    -1.2     40.0
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     12              13.5    -1.5        2
DAYS MIN <= 32     25              25.3    -0.3       15
DAYS MIN <= 0       1               0.6     0.4        0

PRECIPITATION (INCHES)
TOTALS           1.05              1.98   -0.93     3.19
DAILY AVG.       0.04              0.06   -0.02     0.10
DAYS >= .01        15                MM      MM       15
DAYS >= .10         4                MM      MM        7
DAYS >= .50         0                MM      MM        3
DAYS >= 1.00        0                MM      MM        0
GREATEST
 24 HR. TOTAL    0.37   12/11 TO 12/11

DEGREE_DAYS
HEATING TOTAL    1153              1124      29      765
 SINCE 7/1       2053              2451    -398     1830
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        912               675     237      657
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              9.9
RESULTANT WIND SPEED/DIRECTION   7/237
HIGHEST WIND SPEED/DIRECTION    29/200    DATE  12/31
HIGHEST GUST SPEED/DIRECTION    39/270    DATE  12/26

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC              6
NUMBER OF DAYS CLOUDY         21

AVERAGE RH (PERCENT)     73

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       1
LIGHT RAIN                6     FREEZING RAIN              0
LT FREEZING RAIN          1     HAIL                       0
HEAVY SNOW                7     SNOW                      10
LIGHT SNOW               18     SLEET                      0
FOG                      23     FOG W/VIS <= 1/4 MILE      5
HAZE                     23

-  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 KALAMAZOO 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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