Climatological Report (Monthly)
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CXUS53 KGRR 011650
CLMJXN


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

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

...THE JACKSON MI CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1944 TO 9999

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
HIGHEST            58   12/05        MM      MM       56  12/26
                        12/04
LOWEST            -11   12/28        MM      MM        0  12/19
AVG. MAXIMUM     32.4              34.7    -2.3     32.5
AVG. MINIMUM     18.3              21.5    -3.2     21.8
MEAN             25.4              28.1    -2.7     27.1
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     17              12.6     4.4       13
DAYS MIN <= 32     28              26.5     1.5       25
DAYS MIN <= 0       5               1.1     3.9        1

PRECIPITATION (INCHES)
TOTALS           0.68              1.87   -1.19     0.88
DAILY AVG.       0.02              0.06   -0.04     0.03
DAYS >= .01         9              12.4    -3.4       13
DAYS >= .10         3               5.2    -2.2        3
DAYS >= .50         0               0.8    -0.8        0
DAYS >= 1.00        0               0.1    -0.1        0
GREATEST
 24 HR. TOTAL    0.25   12/11 TO 12/11

DEGREE_DAYS
HEATING TOTAL    1222              1144      78     1165
 SINCE 7/1       2464              2548     -84     2135
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        657               592      65      829
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              8.7
RESULTANT WIND SPEED/DIRECTION   5/220
HIGHEST WIND SPEED/DIRECTION    37/200    DATE  12/05
HIGHEST GUST SPEED/DIRECTION    48/180    DATE  12/05

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            5
NUMBER OF DAYS PC              9
NUMBER OF DAYS CLOUDY         17

AVERAGE RH (PERCENT)     69

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                2     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                7     SNOW                      10
LIGHT SNOW               17     SLEET                      0
FOG                      21     FOG W/VIS <= 1/4 MILE      3
HAZE                     25

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

$$



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