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

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

...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.

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