Climatological Report (Monthly)
Issued by NWS Billings, MT

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000
CXUS55 KBYZ 011239
CLMBIL


CLIMATE REPORT
NATIONAL WEATHER SERVICE BILLINGS MT
537 AM MST SUN JAN 1 2017

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

...THE BILLINGS MT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1934 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
HIGHEST            47   12/03
LOWEST            -19   12/17
AVG. MAXIMUM     25.9              35.2    -9.3
AVG. MINIMUM     11.5              17.8    -6.3
MEAN             18.7              26.5    -7.8
DAYS MAX >= 90      0
DAYS MAX <= 32     19
DAYS MIN <= 32     31
DAYS MIN <= 0       7

PRECIPITATION (INCHES)
TOTALS           1.67              0.50    1.17
DAYS >= .01         9
DAYS >= .10         4
DAYS >= .50         1
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.70   12/15 TO 12/16

SNOWFALL (INCHES)
TOTALS           30.4R              8.2    22.2
SINCE 7/1        35.7              19.9    15.8
SNOWDEPTH AVG.      6
DAYS >= TRACE      18
DAYS >= 1.0         7
GREATEST
 SNOW DEPTH        20   12/16
 24 HR TOTAL     11.0   12/15 TO 12/15

DEGREE_DAYS
HEATING TOTAL    1427              1193     234
 SINCE 7/1       2686              2821    -135
COOLING TOTAL       0                 0       0
 SINCE 1/1        738               636     102
.................................................

WIND (MPH)
AVERAGE WIND SPEED              12.5
HIGHEST WIND SPEED/DIRECTION    47/260    DATE  12/20
HIGHEST GUST SPEED/DIRECTION    59/270    DATE  12/20

AVERAGE RH (PERCENT)     66

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                0     SNOW                       3
LIGHT SNOW               15     SLEET                      1
FOG                      14     FOG W/VIS <= 1/4 MILE      3
HAZE                      7

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

&&

...DECEMBER 2016 MONTH IN REVIEW FOR BILLINGS...

BELOW IS A SUMMARY OF THE TEMPERATURE...PRECIPITATION...AND WIND
STATISTICS FOR BILLINGS FOR DECEMBER 2016. 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   2016 VALUES  NORMALS    DEPARTURE  RANKING

DECEMBER     1.67     0.50       +1.17      6TH WETTEST OUT OF 83 YEARS
                                            (RECORD WETTEST WAS 2.00 IN 1973)
                                            (WETTEST SINCE 1.98 IN 2013)

...BILLINGS DECEMBER 2016 BROKEN OR TIED DAILY PRECIPITATION RECORDS...

0.66 ON DECEMBER 15 (OLD RECORD 0.34 IN 1975)

...BILLINGS MONTHLY SNOWFALL...

 MONTH   2016 VALUES  NORMALS    DEPARTURE  RANKING

DECEMBER     30.4       8.2      +22.2      RECORD SNOWIEST OUT OF 83 YEARS
                                            (OLD RECORD SNOWIEST WAS 28.8 IN 1955)

...BILLINGS DECEMBER 2016 BROKEN OR TIED DAILY SNOWFALL RECORDS...

11.0 ON DECEMBER 15 (OLD RECORD 4.2 IN 1975)

...BILLINGS AVERAGE TEMPERATURES...

 MONTH   2016 VALUES  NORMALS   DEPARTURE  RANKING

DECEMBER     18.7      26.5      -7.8      6TH COLDEST OUT OF 83 YEARS
                                           (RECORD COLDEST WAS 8.7 IN 1983)
                                           (COLDEST SINCE 16.5 IN 2009)

...BILLINGS AVERAGE HIGH TEMPERATURES...

 MONTH   2016 VALUES  NORMALS   DEPARTURE  RANKING

DECEMBER     25.9      35.2      -9.3      5TH COLDEST OUT OF 83 YEARS
                                           (RECORD COLDEST WAS 17.6 IN 1983)
                                           (COLDEST SINCE 24.6 IN 2009)

...BILLINGS DECEMBER 2016 BROKEN OR TIED WARMEST DAILY HIGH TEMPERATURE RECORDS...

NONE

...BILLINGS DECEMBER 2016 BROKEN OR TIED COLDEST DAILY HIGH TEMPERATURE RECORDS...

NONE

...BILLINGS AVERAGE LOW TEMPERATURES...

 MONTH   2016 VALUES  NORMALS   DEPARTURE  RANKING

DECEMBER     11.5      17.8      -6.3      15TH COLDEST OUT OF 83 YEARS
                                           (RECORD COLDEST WAS 0.3 IN 1983)
                                           (COLDEST SINCE 8.4 IN 2009)

...BILLINGS DECEMBER 2016 BROKEN OR TIED WARMEST DAILY LOW TEMPERATURE RECORDS...

NONE

...BILLINGS DECEMBER 2016 BROKEN OR TIED COLDEST DAILY LOW TEMPERATURE RECORDS...

NONE

...BILLINGS MONTHLY WIND AVERAGES...

 MONTH   2016 VALUES  NORMALS    DEPARTURE  RANKING

DECEMBER     12.5      12.9       -0.4      TIED FOR THE 22ND LEAST WINDIEST OUT OF 68 YEARS
                                            (RECORD LEAST WINDIEST WAS 10.3 IN 1983)
                                            (LEAST WINDIEST SINCE 12.3 IN 2015)

$$




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