006
CXUS55 KBOI 011732
CLMBOI
CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
1126 AM MDT SAT JUL 01 2023
JUNE WAS WARM AND STORMY, WITH TEMPERATURES SLIGHTLY ABOVE NORMAL.
PRECIPITATION WAS ABOVE NORMAL AT THE AIRPORT, WITH JUST UNDER AN
INCH OF RAIN. HEAVIER SHOWERS WERE CONCENTRATED FROM THE AIRPORT
NORTH ACROSS EASTERN PORTIONS OF BOISE AND THE NEARBY FOOTHILLS.
BECAUSE OF THE SCATTERED NATURE OF CONVECTIVE SHOWERS, MANY AREAS OF
THE TREASURE VALLEY HAD MUCH LESS RAIN. FOR EXAMPLE, ONE LOCATION 3
MILES WEST-SOUTHWEST OF THE AIRPORT MEASURED UNDER A QUARTER INCH
FOR THE MONTH.
BETWEEN THE 1ST AND THE 6TH, TWO UPPER-LEVEL TROUGHS, ONE OVER THE
GULF OF ALASKA AND THE OTHER OVER THE PACIFIC BETWEEN CALIFORNIA AND
HAWAII, WERE DRIFTING SLOWLY EASTWARD.
DURING THAT PERIOD, AN UPPER-LEVEL RIDGE OVER THE WESTERN STATES WAS
RESPONSIBLE FOR RAISING TEMPERATURES FROM A FEW DEGREES ABOVE NORMAL
FROM THE 1ST TROUGH THE 3RD TO AROUND 10 DEGREES ABOVE NORMAL FROM
THE 4TH THROUGH THE 6TH.
BY THE MORNING OF THE 6TH, THE NORTHERN TROUGH HAD MOVED INLAND OVER
WESTERN CANADA WITH LITTLE EFFECT ON OUR AREA, WHILE THE SOUTHERN
TROUGH, CARRYING ABUNDANT MOISTURE, WAS OVER SOUTHERN CALIFORNIA.
BY THE AFTERNOON OF THE 6TH, THE SOUTHERN TROUGH HAD CHANGED COURSE
AND WAS HEADING TOWARDS IDAHO. SURFACE HEATING HAD RAISED
TEMPERATURES INTO THE LOWER 90'S IN THE BOISE AREA, RESULTING IN AN
UNSTABLE ATMOSPHERE WHICH TRIGGERED STRONG THUNDERSTORMS, FUELED BY
MOISTURE COMING UP FROM THE SOUTH.
ONE OF THESE STORMS UNLEASHED TORRENTIAL RAIN OVER THE AIRPORT AND
EAST BOISE, RESULTING IN FLOODING OF MANY STREETS IN THE DOWNTOWN
AND NORTH END AREAS. WATER OVERWHELMED STORM DRAINS AND FLOWED OVER
SIDEWALKS AND LAWNS. WATER UP TO TWO FEET DEEP LEFT SEVERAL VEHICLES
STRANDED DOWNTOWN. THE CONNECTOR WAS FLOODED, AS WERE SOME
APARTMENTS AND SEVERAL BUILDINGS ON THE BSU CAMPUS. RAINFALL RATES
OVER AN INCH AN HOUR, WITH LOCALIZED TOTALS UP TO 1.85 INCHES,
OCCURRED BETWEEN 6 PM AND 10 PM MDT.
THE TROUGH HUNG OVER THE WESTERN REGION, RESULTING IN DAILY SHOWERS
AND THUNDERSTORMS WITH STRONG GUSTY WINDS. THE STORMS BUILT OVER THE
MOUNTAINS AND MOVED OVER THE VALLEY DURING THE AFTERNOONS AND
EVENINGS FROM THE 7TH THROUGH THE 13TH, BUT RAINFALL TOTALS WERE
LIGHT AT THE AIRPORT.
ON THE 7TH, THUNDERSTORM OUTFLOW WINDS UP TO 58 MPH WERE REPORTED
AROUND BOISE.
ON THE 11TH, HAIL RANGING FROM HALF AN INCH TO AN INCH FELL WITH
THUNDERSTORMS IN THE TREASURE VALLEY.
ON THE 13TH, A LARGE TREE WAS BLOWN DOWN THREE MILES NORTHWEST OF
GARDEN CITY.
ALSO ON THE 13TH, STREET FLOODING FROM THUNDERSTORMS WAS REPORTED IN
EAGLE, WITH ABOUT 8 INCHES OF STANDING WATER.
ON THE 14TH, TEMPERATURES TOOK A DIVE AND HUMIDITIES PLUMMETED
FOLLOWING A COLD FRONT. HIGHS WERE NEAR NORMAL ON THE 14TH AND A FEW
DEGREES BELOW NORMAL ON THE 15TH AND 16TH.
ON THE 18TH, A WINTRY TROUGH FROM THE GULF OF ALASKA INVADED THE
PACIFIC NORTHWEST. ONLY LIGHT RAIN FELL AT THE AIRPORT, AND SNOW
FELL ON THE MOUNTAINS ABOVE 6000 FEET. TEMPERATURES AVERAGED 10-15
DEGREES BELOW NORMAL FROM THE 19TH THROUGH THE 21ST. THE HIGH ON THE
19TH WAS ONLY 62, WITH BLUSTERY NORTHWEST WINDS GUSTING AS HIGH AS
46 MPH. ON THE 21ST, THE FIRST DAY OF SUMMER, THE HIGH WAS A
PLEASANT 73.
NO MEASURABLE RAIN FELL FOR THE REST OF THE MONTH.
THE TROUGH GRADUALLY WEAKENED AND RELOCATED OFFSHORE. A WEAK RIDGE
BUILT OVER THE AREA ON THE 24TH AND 25TH, RAISING TEMPERATURES A FEW
DEGREES ABOVE NORMAL.
THE TROUGH SHIFTED BACK INLAND ON THE 25TH, AND TEMPERATURES WERE A
FEW DEGREES BELOW NORMAL THROUGH THE 28TH.
ON THE 29TH, AN UPPER-LEVEL RIDGE BEGAN TO BUILD IN FROM THE WEST,
AND ON THE 30TH THE TEMPERATURE MAXED OUT AT 96 DEGREES.
...............................
..THE BOISE ID CLIMATE SUMMARY FOR THE MONTH OF JUNE 2023
CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1875 TO 2023
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE
NORMAL
..........................................................
TEMPERATURE (F)
HIGHEST 96 06/30
LOWEST 41 06/20
AVG. MAXIMUM 81.7 81.4 0.3
AVG. MINIMUM 55.8 54.1 1.7
MEAN 68.8 67.8 0.9
DAYS MAX >= 90 3
DAYS MAX <= 32 0
DAYS MIN <= 32 0
DAYS MIN <= 0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 3.41 1941
TOTALS 0.97 0.75 0.22
DAYS >= .01 8
DAYS >= .10 2
DAYS >= .50 1
DAYS >= 1.00 0
GREATEST
24 HR. TOTAL 0.56 06/06 TO 06/06
DEGREE DAYS
HEATING TOTAL 30 61 -31 65
SINCE 7/1 5461 5320 141
COOLING TOTAL 151 143 8 143
SINCE 1/1 246 188 58
..........................................................
WIND (MPH)
AVERAGE WIND SPEED 7.2
HIGHEST WIND SPEED/DIRECTION 36/300 DATE 06/19
36/280 06/26
HIGHEST GUST SPEED/DIRECTION 51/070 DATE 06/07
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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