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Climatological Report (Monthly)
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CXUS55 KTFX 021653 CCA
CLMHLN

CLIMATE REPORT...COR
NATIONAL WEATHER SERVICE GREAT FALLS MT
949 AM MST WED JAN 2 2019

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...THE HELENA MT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1866 TO 2019

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              64   12/27/1980
 LOW              -40   12/30/1880
HIGHEST            50   12/18        35      15       48  12/18
LOWEST             -4   12/31         9     -13      -13  12/31
AVG. MAXIMUM     37.0              31.7     5.3     26.2
AVG. MINIMUM     19.1              11.9     7.2      9.7
MEAN             28.0              21.8     6.2     18.0
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     10              14.1    -4.1       18
DAYS MIN <= 32     30              29.8     0.2       31
DAYS MIN <= 0       1               5.5    -4.5        9

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.64   1880
 MINIMUM            T   1935
                        1930
TOTALS           0.16              0.40   -0.24     1.83
DAYS >= .01         5               6.6    -1.6
DAYS >= .10         0               1.5    -1.5
DAYS >= .50         0               0.0     0.0
DAYS >= 1.00        0               0.0     0.0
GREATEST
 24 HR. TOTAL    0.07   12/30 TO 12/30

SNOWFALL (INCHES)
RECORDS
 TOTAL          102.8   1929
 24 HR TOTAL     18.0   12/09/1906 TO 12/09/1906
TOTALS            2.0               7.3    -5.3     23.9
SINCE 7/1         4.4              16.1   -11.7
SNOWDEPTH AVG.      0
DAYS >= TRACE      12               6.0     6.0
DAYS >= 1.0         1               2.3    -1.3
GREATEST
 SNOW DEPTH         1   12/31
 24 HR TOTAL      1.0   12/30 TO 12/30

DEGREE_DAYS
HEATING TOTAL    1138              1339    -201     1452
 SINCE 7/1       3021              3221    -200     3333
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        410               406       4      702
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              5.9
HIGHEST WIND SPEED/DIRECTION    44/270    DATE  12/12
HIGHEST GUST SPEED/DIRECTION    54/270    DATE  12/12

SKY COVER
AVERAGE SKY COVER           0.50

AVERAGE RH (PERCENT)     65

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM          0         MIXED PRECIP          0
HEAVY RAIN            0         RAIN                  0
LIGHT RAIN            0         FREEZING RAIN         0
LT FREEZING RAIN      0         HAIL                  0
HEAVY SNOW            2         SNOW                  2
LIGHT SNOW           11         SLEET                 0
FOG                  10         FOG W/VIS <=1/4 MILE  3
HAZE                  2

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

$$
National Weather Service National Headquarters
