Climatological Report (Monthly)
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CXUS55 KTFX 010816
CLMHLN


CLIMATE REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
216 AM MDT SUN OCT 1 2017

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

...THE HELENA MT CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 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              99   09/05/1967
 LOW                6   09/24/1926
HIGHEST            97   09/03        77      20       92  09/01
LOWEST             32   09/25        36      -4       36  09/13
                        09/24
AVG. MAXIMUM     71.7              72.6    -0.9     70.8
AVG. MINIMUM     44.2              43.1     1.1     45.6
MEAN             57.9              57.8     0.1     58.2
DAYS MAX >= 90      5               1.6     3.4        1
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      2               1.6     0.4        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.66   1882
 MINIMUM         0.00   2012
TOTALS           1.92              1.10    0.82     0.97
DAYS >= .01         7               6.1     0.9
DAYS >= .10         3               2.8     0.2
DAYS >= .50         2               0.6     1.4
DAYS >= 1.00        1               0.0     1.0
GREATEST
 24 HR. TOTAL    1.02   09/15 TO 09/15

SNOWFALL (INCHES)
RECORDS
 TOTAL           14.2   1925
 24 HR TOTAL     13.3   09/17/1957 TO 09/18/1957
TOTALS              T               1.3    -1.3      0.0
SINCE 7/1           T               1.6    -1.6
SNOWDEPTH AVG.      0
DAYS >= TRACE       1               0.7     0.3
DAYS >= 1.0         0               0.4    -0.4
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL        T   09/22 TO 09/22

DEGREE_DAYS
HEATING TOTAL     268               237      31      210
 SINCE 7/1        270               306     -36      254
COOLING TOTAL      66                23      43       13
 SINCE 1/1        702               406     296      455
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              5.3
HIGHEST WIND SPEED/DIRECTION    33/290    DATE  09/19
HIGHEST GUST SPEED/DIRECTION    44/270    DATE  09/20

SKY COVER
AVERAGE SKY COVER           0.30

AVERAGE RH (PERCENT)     54

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

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

$$



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