Climatological Report (Monthly)
Issued by NWS

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CXUS55 KTFX 011007
CLMHLN


CLIMATE REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
238 AM MST MON JAN 1 2018

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

...THE HELENA MT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1866 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              64   12/04/1918 and 12/27/1980
 LOW              -40   12/30/1880
HIGHEST            48   12/18        35      13       48  12/20
LOWEST            -13   12/31         9     -22      -28  12/17
AVG. MAXIMUM     26.2              31.7    -5.5     24.3
AVG. MINIMUM      9.7              11.9    -2.2      5.8
MEAN             18.0              21.8    -3.8     15.0
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     18              14.1     3.9       21
DAYS MIN <= 32     31              29.8     1.2       31
DAYS MIN <= 0       9               5.5     3.5       11

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.64   1880
 MINIMUM            T   1935
                        1930
TOTALS           1.83              0.40    1.43     1.28
DAYS >= .01        14               6.6     7.4
DAYS >= .10         7               1.5     5.5
DAYS >= .50         1               0.0     1.0
DAYS >= 1.00        0               0.0     0.0
GREATEST
 24 HR. TOTAL    0.64   12/29 TO 12/29

SNOWFALL (INCHES)
RECORDS
 TOTAL          102.8   1929
 24 HR TOTAL     18.0   12/09/1906 TO 12/09/1906
TOTALS           23.9               7.3    16.6     23.8
SINCE 7/1        32.7              16.1    16.6
SNOWDEPTH AVG.      2
DAYS >= TRACE      18               6.0    12.0
DAYS >= 1.0         7               2.3     4.7
GREATEST
 SNOW DEPTH        10   12/31
                        12/30
 24 HR TOTAL      9.5   12/29 TO 12/29

DEGREE_DAYS
HEATING TOTAL    1452              1339     113     1542
 SINCE 7/1       3333              3221     112     3017
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        702               406     296      455
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              4.3
HIGHEST WIND SPEED/DIRECTION    28/260    DATE  12/04
HIGHEST GUST SPEED/DIRECTION    34/280    DATE  12/17

SKY COVER
AVERAGE SKY COVER           0.50

AVERAGE RH (PERCENT)     80

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                1     SNOW                       5
LIGHT SNOW               17     SLEET                      0
FOG                      21     FOG W/VIS <= 1/4 MILE      8
HAZE                     13

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

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