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Climatological Report (Monthly)
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CXUS55 KTFX 020507
CLMHLN

CLIMATE REPORT...COR
NATIONAL WEATHER SERVICE GREAT FALLS MT
1100 PM MDT MON OCT 1 2018

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

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

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1866 TO 2018

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            88   09/07        77      11       97  09/03
                        09/06
LOWEST             33   09/30        36      -3       32  09/25
                                                          09/24
AVG. MAXIMUM     70.6              72.6    -2.0     71.7
AVG. MINIMUM     43.5              43.1     0.4     44.2
MEAN             57.0              57.8    -0.8     57.9
DAYS MAX >= 90      0               1.6    -1.6        5
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               1.6    -1.6        2
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.66   1882
 MINIMUM         0.00   2012
TOTALS           0.76              1.10   -0.34     1.92
DAYS >= .01         9               6.1     2.9
DAYS >= .10         2               2.8    -0.8
DAYS >= .50         0               0.6    -0.6
DAYS >= 1.00        0               0.0     0.0
GREATEST
 24 HR. TOTAL    0.27   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        T
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   09/30 TO 09/30

DEGREE_DAYS
HEATING TOTAL     247               237      10      268
 SINCE 7/1        318               306      12      270
COOLING TOTAL      18                23      -5       66
 SINCE 1/1        410               406       4      702
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              6.2
HIGHEST WIND SPEED/DIRECTION    30/350    DATE  09/03
HIGHEST GUST SPEED/DIRECTION    40/350    DATE  09/03

SKY COVER
AVERAGE SKY COVER           0.30

AVERAGE RH (PERCENT)     53

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM          2         MIXED PRECIP          0
HEAVY RAIN            1         RAIN                  2
LIGHT RAIN            9         FREEZING RAIN         0
LT FREEZING RAIN      0         HAIL                  0
HEAVY SNOW            0         SNOW                  1
LIGHT SNOW            1         SLEET                 0
FOG                   4         FOG W/VIS <=1/4 MILE  0
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
