Climatological Report (Monthly)
Issued by NWS

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CXUS55 KTFX 011528
CLMHLN

CLIMATE REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
928 AM MDT TUE JUN 01 2021

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

...THE HELENA MT CLIMATE SUMMARY FOR THE MONTH OF MAY 2021...

CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1866 TO 2021

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             95   05/28/1919
 LOW              17   05/02/1954
HIGHEST           86   05/17         70      16       89  05/30
LOWEST            27   05/21         36      -9       31  05/05
AVG. MAXIMUM    64.0               66.4    -2.4     66.7
AVG. MINIMUM    39.8               41.5    -1.7     42.2
MEAN            51.9               53.9    -2.0     54.5
DAYS MAX >= 90     0                0.3    -0.3        0
DAYS MAX <= 32     0                0.0     0.0        0
DAYS MIN <= 32     4                3.4     0.6        1
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        6.67   1927
 MINIMUM        0.24
TOTALS          2.26               1.95    0.31     1.57
DAYS >= .01       10               11.2    -1.2
DAYS >= .10        7                5.3     1.7
DAYS >= .50        1                1.1    -0.1
DAYS >= 1.00       0                0.1    -0.1
GREATEST
 24 HR. TOTAL   0.74   05/19 TO 05/20

SNOWFALL (INCHES)
RECORDS
 TOTAL          13.9   1927
 24 HR TOTAL    12.5   05/10/1967 TO 05/10/1967
TOTALS           8.0                0.1     7.9        T
SINCE 7/1       64.1               37.2    26.9
SNOWDEPTH AVG.     0
DAYS >= TRACE      3                0.2     2.8
DAYS >= 1.0        1                0.0     1.0
GREATEST
 SNOW DEPTH        6   05/22
 24 HR TOTAL      MM

DEGREE DAYS
HEATING TOTAL    398                350      48       95
 SINCE 7/1      6935               7357    -422       MM
COOLING TOTAL      0                  7      -7       11
 SINCE 1/1         0                  7      -7       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              7.6
HIGHEST WIND SPEED/DIRECTION    31/280    DATE  05/08
                                31/280          05/18
HIGHEST GUST SPEED/DIRECTION    46/280    DATE  05/08

SKY COVER
AVERAGE SKY COVER           0.45

AVERAGE RH (PERCENT)     53

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       1
LIGHT RAIN               10     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       2
LIGHT SNOW                3     SLEET                      0
FOG                       5     FOG W/VIS <= 1/4 MILE      3
HAZE                      2

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

$$



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