Climatological Report (Monthly)
Issued by NWS Billings, MT

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000
CXUS55 KBYZ 011047
CLMBIL


CLIMATE REPORT
NATIONAL WEATHER SERVICE BILLINGS MT
342 AM MST MON JAN 1 2018

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

...THE BILLINGS MT CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 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            57   12/12
                        12/08
LOWEST            -17   12/31
AVG. MAXIMUM     31.9              35.2    -3.3
AVG. MINIMUM     16.9              17.8    -0.9
MEAN             24.4              26.5    -2.1
DAYS MAX >= 90      0
DAYS MAX <= 32     14
DAYS MIN <= 32     28
DAYS MIN <= 0       6

PRECIPITATION (INCHES)
TOTALS           1.81              0.50    1.31
DAYS >= .01        10
DAYS >= .10         7
DAYS >= .50         1
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.72   12/29 TO 12/29

SNOWFALL (INCHES)
TOTALS           25.3               8.2    17.1
SINCE 7/1        37.5              19.9    17.6
SNOWDEPTH AVG.      3
DAYS >= TRACE      16
DAYS >= 1.0         7
GREATEST
 SNOW DEPTH        17   12/31
 24 HR TOTAL      8.9   12/29 TO 12/29

DEGREE_DAYS
HEATING TOTAL    1251              1193      58
 SINCE 7/1       2853              2821      32
COOLING TOTAL       0                 0       0
 SINCE 1/1        840               636     204
.................................................

WIND (MPH)
AVERAGE WIND SPEED              12.3
HIGHEST WIND SPEED/DIRECTION    36/260    DATE  12/05
HIGHEST GUST SPEED/DIRECTION    46/260    DATE  12/05

AVERAGE RH (PERCENT)     67

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                3     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       4
LIGHT SNOW               16     SLEET                      0
FOG                      15     FOG W/VIS <= 1/4 MILE      3
HAZE                      3

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

&&

...DECEMBER 2017 MONTH IN REVIEW FOR BILLINGS...

BELOW IS A SUMMARY OF THE TEMPERATURE...PRECIPITATION...AND WIND
STATISTICS FOR BILLINGS FOR DECEMBER 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

DECEMBER     1.81     0.50       +1.31      5TH WETTEST OUT OF 84 YEARS
                                            (RECORD WETTEST WAS 2.00 IN 1973)
                                            (WETTEST SINCE 1.98 IN 2013)

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

0.72 ON DECEMBER 29 (OLD RECORD 0.30 IN 1973)

...BILLINGS MONTHLY SNOWFALL...

 MONTH   2017 VALUES  NORMALS    DEPARTURE  RANKING

DECEMBER     25.3       8.2      +17.1      3RD SNOWIEST OUT OF 84 YEARS
                                            (RECORD SNOWIEST WAS 30.4 IN 2016)
                                            (SNOWIEST SINCE 30.4 IN 2016)

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

2.3 ON DECEMBER 27 (OLD RECORD 2.0 IN 1934)
8.9 ON DECEMBER 29 (OLD RECORD 4.1 IN 2010)

...BILLINGS AVERAGE TEMPERATURES...

 MONTH   2017 VALUES  NORMALS   DEPARTURE  RANKING

DECEMBER     24.4      26.5      -2.1      23RD COLDEST OUT OF 84 YEARS
                                           (RECORD COLDEST WAS 8.7 IN 1983)
                                           (COLDEST SINCE 18.7 IN 2016)

...BILLINGS AVERAGE HIGH TEMPERATURES...

 MONTH   2017 VALUES  NORMALS   DEPARTURE  RANKING

DECEMBER     31.9      35.2      -3.3      23RD COLDEST OUT OF 84 YEARS
                                           (RECORD COLDEST WAS 17.6 IN 1983)
                                           (COLDEST SINCE 25.9 IN 2016)

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

57 ON DECEMBER 12 (TIED RECORD IN 1988)

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

-6 ON DECEMBER 31 (OLD RECORD -5 IN 1941)

...BILLINGS AVERAGE LOW TEMPERATURES...

 MONTH   2017 VALUES  NORMALS   DEPARTURE  RANKING

DECEMBER     16.9      17.8      -0.9      29TH COLDEST OUT OF 84 YEARS
                                           (RECORD COLDEST WAS 0.3 IN 1983)
                                           (COLDEST SINCE 11.5 IN 2016)

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

NONE

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

NONE

...BILLINGS MONTHLY WIND AVERAGES...

 MONTH   2017 VALUES  NORMALS    DEPARTURE  RANKING

DECEMBER     12.3      12.9       -0.6      TIED FOR THE 21ST LEAST WINDIEST OUT OF 69 YEARS
                                            (RECORD LEAST WINDIEST WAS 10.3 IN 1983)
                                            (LEAST WINDIEST SINCE 12.3 IN 2015)

$$





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