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000
CXUS46 KOTX 011428
CLMLWS

CLIMATE REPORT
NATIONAL WEATHER SERVICE SPOKANE, WA
417 AM PDT SAT JUN 1 2013

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

MAY 2013 BROUGHT A WIDE VARIETY OF WEATHER TO SOUTHEAST WASHINGTON
AND THE SOUTH IDAHO PANHANDLE.  AFTER A COLD START ON THE MORNING OF
THE 1ST WITH FREEZING TEMPERATURES...TEMPERATURES JUST GOT WARMER
AND WARMER EVERY DAY THROUGH THE 10TH.  A STRONG RIDGE OF HIGH
PRESSURE BROUGHT TEMPERATURES TYPICAL OF LATE JULY OR AUGUST WITH
HIGH TEMPERATURES PEAKING ON THE 10TH AND 11TH WHERE LEWISTON
REACHED THE LOWER TO MID 90S.  THIS HEAT WAVE ENDED ON THE 13TH WITH
A STRONG SYSTEM PASSING THROUGH.  ONLY LIGHT RAINFALL AMOUNTS
OCCURRED...BUT WINDY CONDITIONS WERE COMMON WITH A PEAK WIND GUST OF
47 MPH AT LEWISTON.  TEMPERATURES TRENDING DOWNWARD FOR THE REST OF
THE MONTH.  FROM THE 13TH THROUGH THE 20TH TEMPERATURES COOLED TO
NEAR NORMAL VALUES.  ON THE 21ST THROUGH THE 29TH A MUCH COOLER AND
UNSETTLED PERIOD FOLLOWED.

A STRONG WEATHER SYSTEM PASSED THROUGH ON THE 21ST AND 22ND.  A
STRONG COLD BROUGHT VERY UNUSUAL CONDITIONS TO LEWISTON ON THE 21ST
WHERE TEMPERATURES FELL DRASTICALLY DURING THE AFTERNOON.
TEMPERATURES FELL FROM 76 DEGREES AT 11 AM TO 48 DEGREES AT 5 PM
WITH ONLY .02 INCHES OF RAIN DURING THIS PERIOD.  MORE RAIN FOLLOWED
HOWEVER WITH LEWISTON RECEIVING 0.48 INCHES ON THE 21ST AND 22ND.
SNOW LEVELS FALL DRASTICALLY BEHIND THE FRONT WITH 3.2 INCHES OF
SNOW REPORTED ON THE CAMAS PRAIRIE IN WINCHESTER ON THE 22ND.  AFTER
A COLD DAY ON THE 22ND...SKIES CLEARED AND TEMPERATURES FELL TO
BELOW FREEZING IN MANY AREAS ON THE MORNING OF THE 23RD OUTSIDE OF
LEWISTON.  PULLMAN REACHED 30 DEGREES...29 AT POTLATCH...AND 28 IN
LA CROSSE.

TWO RECORDS WERE TIED DURING THE MONTH IN LEWISTON.  ON THE 12TH THE
LOW TEMPERATURE OF 60 TIED A RECORD FOR THE WARMEST READING FOR THE
DATE.  ON THE 23RD THE LOW TEMPERATURE OF 34 TIED A RECORD FOR THE
COLDEST READING THE DATE.

...THE LEWISTON ID AIRPORT CLIMATE SUMMARY FOR THE MONTH OF MAY 2013...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1881 TO 2013

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             104   05/28/1934
 LOW               23   05/01/1954
HIGHEST            93   05/10        MM      MM       90  05/14
LOWEST             32   05/01        MM      MM       34  05/11
AVG. MAXIMUM     74.5              70.9     3.6     69.4
AVG. MINIMUM     47.6              47.0     0.6     45.9
MEAN             61.1              59.0     2.1     57.6
DAYS MAX >= 90      2               1.2     0.8        1
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      1               0.0     1.0        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         3.78   1978
 MINIMUM            T   2003
                        1924
TOTALS           0.86              1.61   -0.75     0.72
DAILY AVG.       0.03              0.05   -0.02     0.02
DAYS >= .01         9              10.6    -1.6        8
DAYS >= .10         3               5.3    -2.3        2
DAYS >= .50         0               0.5    -0.5        0
DAYS >= 1.00        0               0.1    -0.1        0
GREATEST
 24 HR. TOTAL    0.48   05/21 TO 05/22           05/21 TO 05/21


SNOWFALL (INCHES)
RECORDS
 TOTAL            0.3   1916
TOTALS            0.0               0.0     0.0      0.0
SINCE 7/1         2.6              10.5    -7.9     13.5
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0               0.0     0.0        0
GREATEST
 SNOW DEPTH         0                                  0

DEGREE_DAYS
HEATING TOTAL     169               217     -48      235
 SINCE 7/1       4593              5097    -504     4907
COOLING TOTAL      57                30      27       15
 SINCE 1/1         57                32      25       27
..................................................

WIND (MPH)
AVERAGE WIND SPEED              4.7
HIGHEST WIND SPEED/DIRECTION    36/300    DATE  05/21
HIGHEST GUST SPEED/DIRECTION    47/300    DATE  05/13

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.30
NUMBER OF DAYS FAIR           19
NUMBER OF DAYS PC             10
NUMBER OF DAYS CLOUDY          2

AVERAGE RH (PERCENT)     54

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       2
LIGHT RAIN                9     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       1     FOG W/VIS <= 1/4 MILE      0
HAZE                      2

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

$$