Climatological Report (Monthly)
Issued by NWS Boise, ID

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CXUS55 KBOI 011730
CLMBOI

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
1127 AM MDT THU JUN 1 2017

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

...THE BOISE ID CLIMATE SUMMARY FOR THE MONTH OF MAY 2017...

ALTHOUGH ONLY HALF OF THE NORMAL MONTHLY PRECIPITATION FELL AT THE
AIRPORT, AND MEASURABLE RAIN WAS RECORDED ON ONLY 7 DAYS.
NEVERTHELESS STRONG THUNDERSTORMS DID OCCUR IN OUR REGION ON THE
5TH, 12TH, AND 16TH. MOST OF THE SEVERE WEATHER MISSED BOISE, BUT
HIGH WINDS, LARGE HAIL, AND BRIEF HEAVY DOWNPOURS HIT A NUMBER OF
LOCATIONS IN EASTERN OREGON AND SOUTHWEST IDAHO.

TEMPERATURES AVERAGED CLOSE TO NORMAL. THE HIGH OF ONLY 49 ON THE
17TH WAS THE ONLY RECORD. IT WAS THE COOLEST MAXIMUM TEMPERATURE
EVER RECORDED ON THAT DATE, BREAKING THE OLD RECORD OF 51 SET IN
1896. THE LAST FREEZING TEMPERATURE OF THE SEASON WAS 31 ON THE
13TH. THE AVERAGE DATE OF THE LAST 32 DEGREE READING IS MAY 8.

THE LAST FREEZING TEMPERATURE OF THE SEASON WAS 31 ON THE 13TH. THE
AVERAGE DATE OF THE LAST 32 DEGREE READING IS MAY 8.

THE FIRST OFFICIAL 90 DEGREE HIGH OF THE SEASON OCCURRED ON THE
30TH. THE LAST TIME 90 DEGREES WAS REACHED WAS SEPTEMBER 29 LAST
YEAR.

TYPICAL OF SPRING, CHANGING WEATHER PATTERNS BROUGHT A SUCCESSION OF
WARM AND COOL PERIODS. UPPER LEVEL HIGH PRESSURE RIDGES WITH ABOVE
NORMAL TEMPERATURES WERE DISPLACED ABOUT EVERY 6 DAYS BY COLD FRONTS
FOLLOWED BY UPPER LEVEL TROUGHS WITH UNSEASONABLY CHILLY NORTH
PACIFIC AIR, GUSTY NORTHWEST WINDS, AND SHOWERS.

THE MOST NOTEWORTHY OF THESE WEATHER SYSTEMS ARRIVED FROM THE GULF
OF ALASKA ON THE 16TH, PASSING DIRECTLY OVER THE BOISE AREA THAT
AFTERNOON. IT WAS USHERED IN BY A THUNDERSTORM WHICH FORMED OVER THE
LOWER TREASURE VALLEY AND DROPPED HALF AN INCH OF RAIN ON THE BOISE
AIRPORT. SMALL HAIL WAS SEEN IN SOME PARTS OF TOWN.

DURING THE LATE AFTERNOON OF THE 30TH A DRY THUNDERSTORM ROLLED OFF
THE OWYHEES AND ARRIVED AT THE AIRPORT JUST BEFORE 7 PM, WITH GUSTY
WINDS AND BLOWING DUST. A PEAK GUST OF 45 MPH WAS MEASURED AT 6:58
PM.

ON THE 31ST ISOLATED AFTERNOON SHOWERS AND EARLY EVENING
THUNDERSTORMS DEVELOPED WEST OF BOISE AND INTENSIFIED AS THEY MOVED
NORTH AHEAD OF AN APPROACHING PACIFIC COLD FRONT. THEY HAD LITTLE
EFFECT ON THE UPPER TREASURE VALLEY, BUT THE FRONT ENDED THE FIVE
DAY STRETCH OF SUMMERLIKE WEATHER.

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1875 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
HIGHEST            93   05/30
LOWEST             31   05/13
AVG. MAXIMUM     72.5              71.6     0.9
AVG. MINIMUM     46.9              46.5     0.4
MEAN             59.7              59.1     0.6
DAYS MAX >= 90      1
DAYS MAX <= 32      0
DAYS MIN <= 32      1
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.90   1890
TOTALS           0.74              1.39   -0.65
DAYS >= .01         7
DAYS >= .10         1
DAYS >= .50         1
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.50   05/16 TO 05/16

DEGREE_DAYS
HEATING TOTAL     215               226     -11      138
 SINCE 7/1       5454              5450       4
COOLING TOTAL      62                41      21       26
 SINCE 1/1         62                44      18
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              8.8
RESULTANT WIND SPEED/DIRECTION   2/301
HIGHEST WIND SPEED/DIRECTION    36/200    DATE  05/30
HIGHEST GUST SPEED/DIRECTION    45/200    DATE  05/30

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

AVERAGE RH (PERCENT)     50


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

$$


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