697  
CXUS55 KBOI 011818  
CLMBOI  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BOISE ID  
1211 PM MDT SAT JUN 1 2019  
   
...............................
 
 
   
..THE BOISE ID CLIMATE SUMMARY FOR THE MONTH OF MAY 2019
 
 
IT WAS THE WETTEST MAY SINCE 2005, AND THE 6TH WETTEST ON RECORD,  
WITH A TOTAL OF 3.98 INCHES. IN ADDITION, THE PERIOD FROM JANUARY 1  
THROUGH MAY 31 IS THE WETTEST ON RECORD AT THE BOISE AIRPORT, AT  
12.07 INCHES. IT RANKS IN SECOND PLACE FOR THE ENTIRE PERIOD OF  
RECORD IN THE BOISE AREA (BEHIND 1896 AT 14.27 INCHES), AND EVEN  
EXCEEDS BOISE'S AVERAGE ANNUAL PRECIPITATION OF 11.73 INCHES.  
 
NO RAIN FELL DURING THE FIRST TWO WEEKS OF THE MONTH. DURING THE  
REST OF THE MONTH MOST DAYS HAD MEASURABLE RAIN.  
 
NORTHWEST FLOW ALOFT KEPT TEMPERATURES BELOW NORMAL FOR THE FIRST  
TWO DAYS OF THE MONTH. A WARMING TREND BEGAN ON THE 3RD AS A WARM  
UPPER LEVEL HIGH PRESSURE RIDGE CENTERED OFFSHORE BEGAN TO EXTEND  
ITS INFLUENCE INLAND. THE RIDGE KEPT OUR AREA WARM AND DRY AS IT  
MOVED INLAND OVER THE NEXT SEVERAL DAYS. BY THE 15TH IT WAS EAST OF  
THE ROCKIES, AND A PACIFIC COLD FRONT WAS APPROACHING.  
 
UNSEASONABLY COOL AND WET WEATHER FOLLOWED THE FRONT ON THE 16TH AS  
AN UPPER LEVEL TROUGH SETTLED OVER THE INTERMOUNTAIN REGION, WHERE  
IT REMAINED FOR THE REST OF THE MONTH. THE MOIST AND UNSTABLE AIR  
PROVIDED FAVORABLE CONDITIONS FOR DAILY ROUNDS OF SHOWERS AND  
THUNDERSTORMS, SOME OF WHICH PRODUCED LOCALLY HEAVY SHOWERS.  
 
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 87 05/13  
LOWEST 31 05/01  
AVG. MAXIMUM 71.2 71.6 -0.4  
AVG. MINIMUM 48.5 46.5 2.0  
MEAN 59.8 59.1 0.7  
DAYS MAX >= 90 0  
DAYS MAX <= 32 0  
DAYS MIN <= 32 1  
DAYS MIN <= 0 0  
 
PRECIPITATION (INCHES)  
RECORD  
MAXIMUM 4.90 1890  
TOTALS 3.98 1.39 2.59  
DAYS >= .01 13  
DAYS >= .10 9  
DAYS >= .50 3  
DAYS >= 1.00 0  
GREATEST  
24 HR. TOTAL 0.84 05/28 TO 05/29  
 
SNOWFALL (INCHES)  
TOTALS T  
SINCE 7/1 18.0  
GREATEST  
SNOW DEPTH 0  
24 HR TOTAL T 04/24, 04/28-04/30  
 
DEGREE_DAYS  
HEATING TOTAL 173 226 -53 82  
SINCE 7/1 5167 5450 -283  
COOLING TOTAL 22 41 -19 55  
SINCE 1/1 24 44 -20    
..........................................................
 
 
WIND (MPH)  
AVERAGE WIND SPEED 7.5  
RESULTANT WIND SPEED/DIRECTION 2/301  
HIGHEST WIND SPEED/DIRECTION 33/180 DATE 05/26  
HIGHEST GUST SPEED/DIRECTION 46/300 DATE 05/07  
 
SKY COVER  
POSSIBLE SUNSHINE (PERCENT) MM  
 
AVERAGE RH (PERCENT) 54  
 
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab ID Page
The Nexlab OR Page Main Text Page