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

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CXUS53 KGRR 011650
CLMGRR


CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAND RAPIDS, MI
1143 AM EST MON JAN 1 2018

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

...THE GRAND RAPIDS MI (ASOS) CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1892 TO 2017

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            61   12/04        53       8       53  12/26
LOWEST            -12   12/27         1     -13        4  12/15
AVG. MAXIMUM     30.9              34.8    -3.9     32.1
AVG. MINIMUM     17.8              23.5    -5.7     23.0
MEAN             24.4              29.2    -4.8     27.5
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     19              11.7     7.3       14
DAYS MIN <= 32     29              25.0     4.0       26
DAYS MIN <= 0       6               0.7     5.3        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         6.95   1893
 MINIMUM         0.31   1913
TOTALS           1.96              2.50   -0.54     2.96
DAILY AVG.       0.06              0.08   -0.02     0.10
DAYS >= .01        19              16.0     3.0       20
DAYS >= .10         7               6.9     0.1       11
DAYS >= .50         0               1.1    -1.1        1
DAYS >= 1.00        0               0.3    -0.3        0
GREATEST
 24 HR. TOTAL    0.33   12/13 TO 12/13

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           32.9              21.9    11.0     37.0
SINCE 7/1        33.5              29.2     4.3     37.8
SNOWDEPTH AVG.      3                 3       0        4
DAYS >= TRACE      23              13.3     9.7       23
DAYS >= 1.0        11               6.6     4.4       11
GREATEST
 SNOW DEPTH        10   12/16                          9  12/19
                                                          12/17
                                                          12/12
 24 HR TOTAL      7.0   12/25 TO 12/25

DEGREE_DAYS
HEATING TOTAL    1252              1111     141     1156
 SINCE 7/1       2443              2449      -6     2104
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        719               699      20      936

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

WIND (MPH)
AVERAGE WIND SPEED              9.9
RESULTANT WIND SPEED/DIRECTION   4/248
HIGHEST WIND SPEED/DIRECTION    41/240    DATE  12/05
HIGHEST GUST SPEED/DIRECTION    52/240    DATE  12/05

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   22
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            0
NUMBER OF DAYS PC             11
NUMBER OF DAYS CLOUDY         20

AVERAGE RH (PERCENT)     77

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              2     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                3     FREEZING RAIN              0
LT FREEZING RAIN          2     HAIL                       0
HEAVY SNOW                3     SNOW                       6
LIGHT SNOW               23     SLEET                      0
FOG                      25     FOG W/VIS <= 1/4 MILE      4
HAZE                     14

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

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