Climatological Report (Monthly)
Issued by NWS Omaha/Valley, NE

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CXUS53 KOAX 021637
CLMOFK

CLIMATE REPORT
NATIONAL WEATHER SERVICE OMAHA NEBRASKA
1137 AM CDT FRI JUN 2 2017

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

...THE NORFOLK CLIMATE SUMMARY FOR THE MONTH OF MAY 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1888 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
HIGHEST            89   05/08
LOWEST             32   05/01
AVG. MAXIMUM     71.2              72.3    -1.1
AVG. MINIMUM     46.3              48.6    -2.3
MEAN             58.8              60.5    -1.7
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32      1
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         9.88   1905
 MINIMUM         0.38   2009
TOTALS           4.33              3.93    0.40
DAILY AVG.       0.14
DAYS >= .01        10
DAYS >= .10         7
DAYS >= .50         4
DAYS >= 1.00        1
GREATEST
 24 HR. TOTAL    1.95   04/30 TO 05/01

SNOWFALL (INCHES)
RECORDS
 TOTAL            2.7   1947
TOTALS            1.5               0.0
SINCE 7/1        32.2
SNOWDEPTH AVG.      0
DAYS >= 1.0         1
GREATEST
 SNOW DEPTH         1R  05/01
 24 HR TOTAL      1.5   05/01 TO 05/01

DEGREE DAYS
HEATING TOTAL     217               190      27
 SINCE 7/1       5896              6613    -717
COOLING TOTAL      28                49     -21
 SINCE 1/1         28                61     -33
.................................................

WIND (MPH)
AVERAGE WIND SPEED              10.2
HIGHEST WIND SPEED/DIRECTION    41/200    DATE  05/17
HIGHEST GUST SPEED/DIRECTION    58/190    DATE  05/15

SKY COVER
AVERAGE SKY COVER           0.30


WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              5     MIXED PRECIP               0
HEAVY RAIN                4     RAIN                       5
LIGHT RAIN               11     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                1     SLEET                      0
FOG                       6     FOG W/VIS <= 1/4 MILE      0
HAZE                      0

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.
>= INDICATES GREATER THAN OR EQUAL TO.
<= INDICATES LESS THAN OR EQUAL TO.

&&

...MAY WAS SLIGHTLY COOLER AND SLIGHTLY WETTER THAN NORMAL IN
NORFOLK...

TEMPERATURES IN NORFOLK TIPPED SLIGHTLY MORE COOL THAN WARM, ENDING
UP 1.7 DEGREES BELOW NORMAL BUT IN THE MIDDLE THIRD OF THE
CLIMATOLOGY (IN OTHER WORDS, IN NEITHER THE WARMEST NOR THE COOLEST
THIRD OF THE RECORD). PRECIPITATION WAS A SLIGHTLY-ABOVE-AVERAGE
0.40 INCHES ABOVE NORMAL, DRIVEN BY A PARTICULARLY WET MID-MONTH
PERIOD.

MAY BEGAN ON THE COOL SIDE FOR THE FIRST FOUR DAYS...WITH THE
COLDEST LOW TEMPERATURE OF THE MONTH ON THE 1ST AT 32 DEGREES. A
DAILY RECORD 1.5 INCHES OF SNOW FELL, WHICH ALSO TIES THE RECORD FOR
THE HIGHEST MAY DAILY SNOWFALL AND THE HIGHEST MONTHLY SNOWFALL
TOTAL FOR MAY. THE FREEZE ON THE 1ST WAS THE LAST FREEZE OF SPRING,
WHICH IS ACTUALLY ONE DAY EARLIER THAN THE PERIOD-OF-RECORD AVERAGE
OF MAY 2. LIGHT RAIN FELL ON THE 3RD, AS WELL. THE SLOW MODERATING
TREND TIPPED TEMPERATURES ABOVE NORMAL BEGINNING ON THE 6TH AND
LASTING THROUGH THE 16TH, WITH A COUPLE OF JUST-BELOW-NORMAL DAYS ON
THE 11TH AND 12TH. THE WARMEST HIGH (89) AND LOW (61) TEMPERATURES
OCCURRED ON THE 8TH. THE PERIOD WAS LARGELY DRY, WITH OVER A HALF
INCH OF RAIN WITH THUNDERSTORMS ON THE 10TH.  AS THE PATTERN BROKE,
SEVERE THUNDERSTORMS IN NORFOLK ON THE 15TH BROUGHT 0.28 INCHES OF
RAIN, WINDS GUSTING TO 58 MPH, AND THE BEGINNING OF A WET PERIOD.

WET CONDITIONS PERSISTED FROM THE 15TH THROUGH THE 20TH, WITH
MEASURABLE RAIN EACH DAY. RAIN FROM THE 16TH THROUGH THE 20TH
TOTALED 3.38 INCHES, WITH OVER AN INCH OF RAIN ON THE 17TH AND WITH
THUNDER ON THREE OF THOSE DAYS. TEMPERATURES FELL TO BELOW-NORMAL
READINGS ON THE 17TH THROUGH THE 24TH IN THIS WETTER PATTERN, AND
THE COLDEST HIGH TEMPERATURE OF THE MONTH WAS A DAILY RECORD COLD
MAXIMUM TEMPERATURE 48 ON THE 20TH. TEMPERATURES RETURNED BRIEFLY TO
NEAR- OR SLIGHTLY ABOVE-NORMAL READINGS ON THE 25TH AND 26TH BEFORE
RETURNING TO BELOW-NORMAL READINGS FROM THE 27TH TO THE 31ST.

FOR THE SPRING MONTHS OF MARCH THROUGH MAY IN NORFOLK, THE AVERAGE
TEMPERATURE OF 49.4 DEGREES WAS 0.2 DEGREES ABOVE NORMAL AND THE
38TH WARMEST ON RECORD. THE TOTAL PRECIPITATION OF 9.37 INCHES WAS
1.02 INCHES ABOVE NORMAL AND THE 38TH WETTEST ON RECORD. THE SPRING
MONTHS SAW 4.1 INCHES OF SNOWFALL, THE 28TH LOWEST ON RECORD FROM
1901 TO PRESENT (WITH NUMEROUS MISSING YEARS).


DAILY RECORDS SET IN MAY 2017:
DATE          RECORD           READING  PREVIOUS RECORD
MAY 1         SNOWFALL           1.5    0.5 (1911)

MONTHLY RECORDS SET IN MAY 2017:
DAY/MONTH  RECORD              READING  PREVIOUS RECORD
MAY 1      DAILY SNOWFALL        1.5    1.5 (TIES WITH 5/9/1945)
MAY        MONTHLY SNOWFALL      1.5    1.5 (TIES WITH 1945)

$$

KLISH



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