Climatological Report (Monthly)
Issued by NWS Billings, MT

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538
CXUS55 KBYZ 011142
CLMBIL


CLIMATE REPORT
NATIONAL WEATHER SERVICE BILLINGS MT
539 AM MDT THU JUN 1 2017

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

...THE BILLINGS MT CLIMATE SUMMARY FOR THE MONTH OF MAY 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            87   05/12
LOWEST             35   05/19
AVG. MAXIMUM     69.6              67.5     2.1
AVG. MINIMUM     44.9              43.6     1.3
MEAN             57.3              55.6     1.7
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32      0
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
TOTALS           1.61              2.18   -0.57
DAYS >= .01         7
DAYS >= .10         3
DAYS >= .50         1
DAYS >= 1.00        1
GREATEST
 24 HR. TOTAL    1.02   05/17 TO 05/17

SNOWFALL (INCHES)
TOTALS              T               2.0    -2.0
SINCE 7/1        74.1              55.0    19.1
SNOWDEPTH AVG.      0
DAYS >= TRACE       1
DAYS >= 1.0         0
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL        T   05/02 TO 05/02

DEGREE_DAYS
HEATING TOTAL     248               309     -61
 SINCE 7/1       6565              6686    -121
COOLING TOTAL      15                16      -1
 SINCE 1/1         15                17      -2
.................................................

WIND (MPH)
AVERAGE WIND SPEED              9.2
HIGHEST WIND SPEED/DIRECTION    33/320    DATE  05/13
HIGHEST GUST SPEED/DIRECTION    42/320    DATE  05/13

AVERAGE RH (PERCENT)     53

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              4     MIXED PRECIP               0
HEAVY RAIN                3     RAIN                       3
LIGHT RAIN               13     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       1
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       4     FOG W/VIS <= 1/4 MILE      0
HAZE                      1

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

&&

...MAY 2017 MONTH IN REVIEW FOR BILLINGS...

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

MAY          1.61     2.18       -0.57      31ST DRIEST OUT OF 83 YEARS
                                            (RECORD DRIEST WAS 0.22 IN 2001)
                                            (DRIEST SINCE 0.64 IN 2009)

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

NONE

...BILLINGS MONTHLY SNOWFALL...

 MONTH   2017 VALUES  NORMALS    DEPARTURE  RANKING

MAY             T       2.0       -2.0      TIED FOR THE 20TH LEAST SNOWIEST OUT OF 83 YEARS
                                            (RECORD LEAST SNOWIEST WAS 0.0 TIED IN 1993)
                                            (LEAST SNOWIEST SINCE T IN 2016)

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

NONE

...BILLINGS AVERAGE TEMPERATURES...

 MONTH   2017 VALUES  NORMALS   DEPARTURE  RANKING

MAY          57.3      55.6      +1.7      TIED FOR THE 20TH WARMEST OUT OF 83 YEARS
                                           (RECORD WARMEST WAS 64.7 IN 1936)
                                           (WARMEST SINCE 57.4 IN 2013)

...BILLINGS AVERAGE HIGH TEMPERATURES...

 MONTH   2017 VALUES  NORMALS   DEPARTURE  RANKING

MAY          69.6      67.5      +2.1      23RD WARMEST OUT OF 83 YEARS
                                           (RECORD WARMEST WAS 80.9 IN 1936)
                                           (WARMEST SINCE 70.6 IN 2009)

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

NONE

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

NONE

...BILLINGS AVERAGE LOW TEMPERATURES...

 MONTH   2017 VALUES  NORMALS   DEPARTURE  RANKING

MAY          44.9      43.6      +1.3      TIED FOR THE 21ST WARMEST OUT OF 83 YEARS
                                           (RECORD WARMEST WAS 49.7 IN 1958)
                                           (WARMEST SINCE 46.2 IN 2013)

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

53 ON MAY  6 (TIED RECORD IN 2016)

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

NONE

...BILLINGS MONTHLY WIND AVERAGES...

 MONTH   2017 VALUES  NORMALS    DEPARTURE  RANKING

MAY           9.2       9.9       -0.7      TIED FOR THE 7TH LEAST WINDIEST OUT OF 68 YEARS
                                            (RECORD LEAST WINDIEST WAS 8.6 IN 1991)
                                            (LEAST WINDIEST SINCE 9.0 IN 2015)

$$





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