Climatological Report (Monthly)
Issued by NWS Boise, ID

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CXUS55 KBOI 011832
CLMBOI

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
1216 PM MDT MON JUN 1 2015

...THE BOISE ID CLIMATE SUMMARY FOR THE MONTH OF MAY 2015...

UNSETTLED WEATHER DOMINATED MAY...ALLEVIATING THE ABNORMALLY DRY
CONDITIONS OF MARCH AND APRIL.

AN UPPER LEVEL LOW PRESSURE TROUGH FROM THE GULF OF ALASKA MOVED
INLAND OVER THE NORTHWEST STATES ON THE 6TH. BY THE 8TH THE LOW
CENTER HAD DRIFTED SOUTH OVER CALIFORNIA AND DEEPENED. THIS PATTERN
PERSISTED...WITH ONLY MINOR VARIATIONS...FOR NEARLY THREE WEEKS...
AS THE TROUGH WAS PERIODICALLY REINFORCED BY MORE SYSTEMS FROM THE
NORTHEAST PACIFIC.

MOIST UNSTABLE AIR CIRCULATING AROUND THE LOW BROUGHT SHOWERS TO THE
BOISE AREA...WITH MEASURABLE RAIN ON THIRTEEN DAYS FROM THE 7TH
THROUGH THE 27TH. SHOWERS WERE ACCOMPANIED BY THUNDER ON EIGHT OF
THOSE DAYS. MOST SHOWERS CONTRIBUTED LESS THAN A TENTH OF AN INCH OF
RAIN...BUT THE .36 OF AN INCH ON THE 12TH WAS THE GREATEST 24-HOUR
TOTAL SINCE THE .40 OF AN INCH OF RAIN ON THE 3RD AND 4TH OF
FEBRUARY.

DESPITE THE SHOWERY WEATHER...PRECIPITATION FOR THE MONTH WAS CLOSE
TO NORMAL.

TEMPERATURES AVERAGED ABOVE NORMAL ON MOST DAYS. ONLY SIX DAYS WERE
COOLER THAN NORMAL.

THE END OF THE MONTH BROUGHT A BRIEF PREVIEW OF SUMMER UNDER AN
UPPER LEVEL RIDGE. THE LOW OF 65 ON THE 30TH SET A RECORD FOR THE
DATE. AND THE HIGH OF 94 ON THE 31ST WAS THE FIRST 90-DEGREE
TEMPERATURE SINCE THE 95 ON SEPTEMBER 24 2014. THIS HELPED PUSH THE
MONTHLY DEPARTURE FORM NORMAL TO PLUS 3.0 DEGREES.

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1878 TO 2015

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
HIGHEST            94   05/31
LOWEST             41   05/06
AVG. MAXIMUM     74.2              71.6     2.6
AVG. MINIMUM     50.0              46.5     3.5
MEAN             62.1              59.1     3.0
DAYS MAX >= 90      1
DAYS MAX <= 32      0
DAYS MIN <= 32      0
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.90   1890
TOTALS           1.50              1.39    0.11
DAYS >= .01        13
DAYS >= .10         4
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.36   05/12 TO 05/12

DEGREE_DAYS
HEATING TOTAL     117               226    -109      150
 SINCE 7/1       4586              5450    -864
COOLING TOTAL      35                41      -6       24
 SINCE 1/1         35                44      -9
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              7.3
RESULTANT WIND SPEED/DIRECTION   2/296
HIGHEST WIND SPEED/DIRECTION    32/140    DATE  05/31
HIGHEST GUST SPEED/DIRECTION    44/170    DATE  05/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

AVERAGE RH (PERCENT)     52


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

$$



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