Climatological Report (Monthly)
Issued by NWS Billings, MT

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000
CXUS55 KBYZ 011116
CLMBIL


CLIMATE REPORT
NATIONAL WEATHER SERVICE BILLINGS MT
506 AM MDT SUN OCT 1 2017

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

...THE BILLINGS MT CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1934 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
HIGHEST            94   09/02
LOWEST             37   09/25
AVG. MAXIMUM     71.7              73.1    -1.4
AVG. MINIMUM     48.6              47.5     1.1
MEAN             60.2              60.3    -0.1
DAYS MAX >= 90      5
DAYS MAX <= 32      0
DAYS MIN <= 32      0
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
TOTALS           2.74              1.30    1.44
DAYS >= .01        10
DAYS >= .10         5
DAYS >= .50         2
DAYS >= 1.00        1
GREATEST
 24 HR. TOTAL    1.22   09/15 TO 09/15

SNOWFALL (INCHES)
TOTALS            0.0               1.1    -1.1
SINCE 7/1         0.0               1.1    -1.1
SNOWDEPTH AVG.      0
DAYS >= TRACE       0
DAYS >= 1.0         0
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL      0.0   09/30 TO 09/30

DEGREE_DAYS
HEATING TOTAL     236               192      44
 SINCE 7/1        238               229       9
COOLING TOTAL      99                51      48
 SINCE 1/1        839               633     206
.................................................

WIND (MPH)
AVERAGE WIND SPEED              8.8
HIGHEST WIND SPEED/DIRECTION    40/280    DATE  09/13
HIGHEST GUST SPEED/DIRECTION    52/270    DATE  09/13

AVERAGE RH (PERCENT)     52

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       4
LIGHT RAIN                9     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       8     FOG W/VIS <= 1/4 MILE      0
HAZE                      4

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

&&

...SEPTEMBER 2017 MONTH IN REVIEW FOR BILLINGS...

BELOW IS A SUMMARY OF THE TEMPERATURE...PRECIPITATION...AND WIND
STATISTICS FOR BILLINGS FOR SEPTEMBER 2017. ALL TEMPERATURES ARE IN
DEGREES FAHRENHEIT AND ALL PRECIPITATION AMOUNTS ARE IN INCHES. NORMALS
ARE 30 YEAR AVERAGES CALCULATED FROM 1981 TO 2010. MONTHLY RANKINGS
FOR PRECIPITATION...SNOWFALL...AND TEMPERATURES USE A PERIOD OF RECORD
THAT STARTED IN AUGUST 1934 AT THE BILLINGS AIRPORT. MONTHLY RANKINGS
FOR WIND USE A PERIOD OF RECORD THAT STARTED IN 1984.

NUMBERS DENOTED WITH AN * IS MISSING DATA IN THE CALCULATION.

...BILLINGS MONTHLY PRECIPITATION...

 MONTH   2017 VALUES  NORMALS    DEPARTURE  RANKING

SEPTEMBER    2.74     1.30       +1.44      6TH WETTEST OUT OF 84 YEARS
                                            (RECORD WETTEST WAS 4.99 IN 1941)
                                            (WETTEST SINCE 3.63 IN 2013)

...BILLINGS SEPTEMBER 2017 BROKEN OR TIED DAILY PRECIPITATION RECORDS...

1.22 ON SEPTEMBER 15 (OLD RECORD 0.64 IN 1965)

...BILLINGS MONTHLY SNOWFALL...

 MONTH   2017 VALUES  NORMALS    DEPARTURE  RANKING

SEPTEMBER     0.0       1.1       -1.1      TIED FOR THE RECORD LEAST SNOWIEST OUT OF 84 YEARS
                                            (OLD RECORD LEAST SNOWIEST WAS 0.0 TIED IN 2016)

...BILLINGS SEPTEMBER 2017 BROKEN OR TIED DAILY SNOWFALL RECORDS...

NONE

...BILLINGS AVERAGE TEMPERATURES...

 MONTH   2017 VALUES  NORMALS   DEPARTURE  RANKING

SEPTEMBER    60.2      60.3      -0.1      41ST COLDEST OUT OF 84 YEARS
                                           (RECORD COLDEST WAS 47.1 IN 1965)
                                           (COLDEST SINCE 59.7 IN 2010)

...BILLINGS AVERAGE HIGH TEMPERATURES...

 MONTH   2017 VALUES  NORMALS   DEPARTURE  RANKING

SEPTEMBER    71.7      73.1      -1.4      TIED FOR THE 29TH COLDEST OUT OF 84 YEARS
                                           (RECORD COLDEST WAS 55.9 IN 1965)
                                           (COLDEST SINCE 71.7 IN 2016)

...BILLINGS SEPTEMBER 2017 BROKEN OR TIED WARMEST DAILY HIGH TEMPERATURE RECORDS...

NONE

...BILLINGS SEPTEMBER 2017 BROKEN OR TIED COLDEST DAILY HIGH TEMPERATURE RECORDS...

NONE

...BILLINGS AVERAGE LOW TEMPERATURES...

 MONTH   2017 VALUES  NORMALS   DEPARTURE  RANKING

SEPTEMBER    48.6      47.5      +1.1      TIED FOR THE 24TH WARMEST OUT OF 84 YEARS
                                           (RECORD WARMEST WAS 53.8 IN 1940)
                                           (WARMEST SINCE 50.6 IN 2016)

...BILLINGS SEPTEMBER 2017 BROKEN OR TIED WARMEST DAILY LOW TEMPERATURE RECORDS...

65 ON SEPTEMBER 10 (OLD RECORD 63 IN 2012)
63 ON SEPTEMBER 11 (OLD RECORD 62 IN 1993)

...BILLINGS SEPTEMBER 2017 BROKEN OR TIED COLDEST DAILY LOW TEMPERATURE RECORDS...

NONE

...BILLINGS MONTHLY WIND AVERAGES...

 MONTH   2017 VALUES  NORMALS    DEPARTURE  RANKING

SEPTEMBER     8.8       9.5       -0.7      TIED FOR THE 13TH LEAST WINDIEST OUT OF 68 YEARS
                                            (RECORD LEAST WINDIEST WAS 7.7 IN 2008)
                                            (LEAST WINDIEST SINCE 8.0 IN 2012)

$$





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