738  
CXUS55 KBOI 011724  
CLMBOI  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BOISE ID  
1121 AM MDT MON JUL 1 2019  
   
...............................
 
 
IT WAS THE SECOND DRIEST JUNE AT THE BOISE AIRPORT, WHERE RECORDS GO  
BACK TO 1940. IT WAS THE FOURTH DIREST JUNE AT ALL BOISE LOCATIONS  
GOING BACK TO 1864. MEASURABLE RAIN FELL ON ONLY TWO DAYS.  
 
THE AVERAGE TEMPERATURE FOR THE MONTH WAS VERY CLOSE TO NORMAL.  
 
JUNE BEGAN WITH ABOVE NORMAL TEMPERATURES, WITH HIGHS IN THE 80S  
UNDER AN UPPER LEVEL HIGH PRESSURE RIDGE.  
 
ON THE 7TH A PACIFIC COLD FRONT, FOLLOWED BY AN UPPER LEVEL LOW  
PRESSURE TROUGH, BROUGHT A BRIEF BREAK IN THE WARM WEATHER. HIGHS  
WERE ONLY IN THE LOWER 60S ON THE 7TH AND 8TH.  
 
BY THE 10TH TEMPERATURES HAD RISEN ABOVE NORMAL AGAIN AS ANOTHER  
HIGH PRESSURE RIDGE BEGAN TO BUILD OVER THE WEST COAST. HIGHS WERE  
IN THE 80S FROM THE 10TH THROUGH THE 19TH, WITH THE EXCEPTION OF THE  
91 ON THE 12TH. THAT WAS THE FIRST 90 DEGREE READING SINCE SEPTEMBER  
7.  
 
FOLLOWING THE 80 DEGREES ON THE 19TH, MUCH COOLER AIR SPREAD SOUTH  
FOLLOWING A COLD FRONT AS AN UPPER LEVEL TROUGH DEEPENED OVER  
SOUTHWEST CANADA AND THE NORTHWEST U.S. HIGHS WERE ONLY IN THE MID  
60S ON THE 20TH AND 21ST.  
 
AFTER A CHILLY 42 DEGREE LOW ON THE 22ND, TEMPERATURES BEGAN A SLOW  
RECOVERY AS THE TROUGH EXITED TO THE EAST. BY THE 25TH MILDER WEST-  
SOUTHWEST FLOW ALOFT HAD RETURNED TEMPERATURES TO NEAR NORMAL.  
 
ON THE 26TH AN UPPER LEVEL TROUGH FROM THE GULF OF ALASKA HAD  
ARRIVED OFF THE WASHINGTON-OREGON COAST. COMING FROM THE COLD WATERS  
OF THE NORTHEAST PACIFIC, IT CONTAINED LITTLE MOISTURE.  
 
AHEAD OF THE TROUGH, SOUTHWEST FLOW ALOFT HELPED THE TEMPERATURE  
WARM TO 89 ON THE 26TH.  
 
AS THE TROUGH EDGED FURTHER EAST THAT DAY, THUNDERSTORMS DEVELOPED  
IN NORTHEAST OREGON ALONG A WEAK COLD FRONT. BUT THEY NEVER GOT AS  
FAR AS BOISE, AND THAT NIGHT THE FRONT PRODUCED NO PRECIPITATION AS  
IT CROSSED SOUTHWEST IDAHO.  
 
THE TROUGH GRADUALLY WEAKENED AND MOVED OFFSHORE. IT CONTINUED TO  
HAVE LITTLE EFFECT ON OUR AREA, ALTHOUGH ON THE 28TH A STATIONARY  
BAND OF DENSE HIGH CLOUDS PREVENTED TEMPERATURES FROM RISING ABOVE  
THE LOWER 70S.  
   
..THE BOISE ID CLIMATE SUMMARY FOR THE MONTH OF JUNE 2019
 
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1875 TO 2019  
 
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S  
VALUE DATE(S) VALUE FROM VALUE  
NORMAL    
.........................................................
 
 
TEMPERATURE (F)  
HIGHEST 91 06/12  
LOWEST 40 06/08  
AVG. MAXIMUM 81.1 81.3 -0.2  
AVG. MINIMUM 53.8 53.7 0.1  
MEAN 67.5 67.5 0.0  
DAYS MAX >= 90 1  
DAYS MAX <= 32 0  
DAYS MIN <= 32 0  
DAYS MIN <= 0 0  
 
PRECIPITATION (INCHES)  
RECORD  
MAXIMUM 3.41 1941  
TOTALS 0.04 0.69 -0.65  
DAYS >= .01 2  
DAYS >= .10 0  
DAYS >= .50 0  
DAYS >= 1.00 0  
GREATEST  
24 HR. TOTAL 0.03 06/12 TO 06/12  
 
DEGREE_DAYS  
HEATING TOTAL 54 64 -10 29  
SINCE 7/1 5222 5514 -292  
COOLING TOTAL 135 139 -4 137  
SINCE 1/1 159 183 -24    
..........................................................
 
 
WIND (MPH)  
AVERAGE WIND SPEED 7.7  
RESULTANT WIND SPEED/DIRECTION 3/308  
HIGHEST WIND SPEED/DIRECTION 35/300 DATE 06/06  
HIGHEST GUST SPEED/DIRECTION 45/300 DATE 06/06  
 
SKY COVER  
POSSIBLE SUNSHINE (PERCENT) MM  
 
AVERAGE RH (PERCENT) 44  
 
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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