Climatological Report (Monthly)
Issued by NWS Boise, ID

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CXUS55 KBOI 011726
CLMBOI

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
1123 AM MDT SUN MAY 1 2016

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

APRIL 2016 WAS THE WARMEST APRIL EVER RECORDED AT THE AIRPORT...AND
IT TIED FOR THIRD WARMEST SINCE TEMPERATURE RECORDING BEGAN IN THE
BOISE AREA IN 1864. IT WAS THE FIFTH CONSECUTIVE WARMER-THAN-NORMAL
MONTH.

A WARM UPPER LEVEL HIGH PRESSURE RIDGE...WHICH DOMINATED THE
INTERMOUNTAIN REGION DURING THE FIRST THREE WEEKS OF THE MONTH...WAS
RESPONSIBLE FOR THE RECORD WARMTH. RELATIVELY WEAK PACIFIC WEATHER
SYSTEMS INTERRUPTED THE RIDGE A COUPLE OF TIMES...ON THE 4TH AND
5TH...AND THE 14TH AND 15TH...BRIEFLY LOWERING TEMPERATURES TO A FEW
DEGREES BELOW NORMAL. NORTHWEST WINDS ACCOMPANIED THE COOLER
AIR...GUSTING TO 36 MPH ON THE 4TH AND 37 MPH ON THE 15TH. ONLY
LIGHT AMOUNTS OF RAIN FELL.

A STRONG AND WET UPPER LEVEL TROUGH PLOWED INTO THE RIDGE ON THE
22ND AND PASSED DIRECTLY OVER BOISE ON THE 23RD...DUMPING NEARLY
HALF AN INCH OF RAIN AT THE AIRPORT...AND UP TO TWICE THAT AMOUNT AT
A FEW TREASURE VALLEY LOCATIONS WEST OF BOISE.

THIS SYSTEM USHERED IN A PATTERN CHANGE...WITH WESTERLY FLOW ALOFT
SPLITTING OVER THE NORTHWEST COAST...AND A COOL UPPER LEVEL TROUGH
EXPANDING OVER THE WESTERN U.S....LOWERING TEMPERATURES IN OUR AREA
TO NEAR NORMAL. THERE WAS NO MEASURABLE RAIN AT BOISE AFTER THE
23RD...AS MOST PRECIPITATION WAS EITHER DEFLECTED SOUTH TO
CALIFORNIA AND THE DESERT SOUTHWEST...OR CONFINED EAST AND NORTH OF
BOISE.

FOLLOWING A COLD FRONT ON THE 25TH...NORTHWEST WINDS GUSTED TO 45
MPH AT THE AIRPORT. THE 28TH THROUGH THE 30TH WERE NOT QUITE THAT
WINDY...BUT GUSTS EXCEEDED 30 MPH EACH DAY.

...THE BOISE ID CLIMATE SUMMARY FOR THE MONTH OF APRIL 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1875 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
HIGHEST            87   04/21
LOWEST             34   04/16
AVG. MAXIMUM     69.0              62.3     6.7
AVG. MINIMUM     43.9              39.3     4.6
MEAN             56.5              50.8     5.7
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32      0
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.73   1869
TOTALS           0.69              1.23   -0.54
DAYS >= .01         4
DAYS >= .10         2
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.47   04/23 TO 04/23

SNOWFALL (INCHES)
TOTALS            0.0
SINCE 7/1        10.9
GREATEST
 SNOW DEPTH         0   MM
 24 HR TOTAL      0.0   04/30 TO 04/30

DEGREE_DAYS
HEATING TOTAL     254               429    -175      407
 SINCE 7/1       4538              5224    -686
COOLING TOTAL       5                 3       2        0
 SINCE 1/1          5                 3       2
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              8.7
RESULTANT WIND SPEED/DIRECTION   3/310
HIGHEST WIND SPEED/DIRECTION    36/320    DATE  04/25
HIGHEST GUST SPEED/DIRECTION    45/330    DATE  04/25

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

AVERAGE RH (PERCENT)     49


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

$$


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