000 CXUS55 KBOI 011226 AAA CLMBOI CLIMATE REPORT...UPDATE NATIONAL WEATHER SERVICE BOISE ID 625 AM MDT WED OCT 1 2008 ................................... ...THE BOISE CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2008... ...A SUNNY WARM SEPTEMBER WITH ONE GOOD DAY OF STORMS AND RAIN... SEPTEMBER 2008 WILL GO DOWN AS BEING WARM AND SUNNY. THE MONTHLY TEMPERATURE AVERAGED ABOUT TWO DEGREES ABOVE NORMAL WITH THE WARM DAYTIME HIGHS MAKING THE DIFFERENCE. A RECORD HIGH TEMPERATURE OF 94 DEGREES WAS TIED ON THE 20TH. THE OLD RECORD WAS IN 1917. SEPTEMBER HAD LONG STRETCHES OF CLOUDLESS BLUE SKIES WITHOUT THE VISIBILITY OR AIR QUALITY ISSUES EXPERIENCED EARLIER IN THE SUMMER FROM FIRES OVER CALIFORNIA. RAINFALL WAS ABOVE NORMAL AND CAME IN AT .94 INCHES. THIS WAS ALMOST TWO TENTHS OF AN INCH ABOVE NORMAL AND IT ALL CAME IN ONE 24 HOUR PERIOD AROUND THE 20TH. A DAY AFTER THE 94F DEGREE RECORD HIGH WAS TIED...A POTENT UPPER LEVEL DISTURBANCE CAME OVER THE AREA DUMPING MODERATE TO HEAVY AMOUNTS OF RAIN ACROSS THE TREASURE VALLEY IN TWO DIFFERENT EPISODES. THUNDERSTORMS CAME DURING THE EARLY MORNING FROM THE SOUTH AND A SECOND WAVE OF STORMS CAME IN THE EARLY EVENING FROM THE WEST. DURING THE MIDDLE PART OF THE DAY IT WAS MILD AND SUNNY AND OVERALL PLEASANT. BOTH STORM EVENTS PRODUCED HEAVY LOCALIZED DOWNPOURS AND ISOLATED POOR DRAINAGE FLOODING. THE STORMS WERE NOT SEVERE WITH WINDS OF 25 TO 35 MPH AND SMALL HAIL...BUT THE HEAVY RAIN WAS THE BIG STORY WITH THESE STORMS. WHILE THE AIRPORT GOT JUST UNDER AN INCH THAT DAY...AREAS TO THE WEST NEAR NAMPA AND CALDWELL RECEIVED CLOSE TO AN INCH AND A HALF. THERE WERE NO FREEZING TEMPERATURES DURING SEPTEMBER AND LOCAL VEGETABLE GARDENS WERE STILL GOING STRONG AS OCTOBER ARRIVED. ..................................................................... CLIMATE NORMAL PERIOD 1971 TO 2000 CLIMATE RECORD PERIOD 1872 TO 2008 WEATHER OBSERVED NORMAL DEPART VALUE DATE(S) VALUE FROM NORMAL ................................................ TEMPERATURE (F) HIGHEST 94 09/19 LOWEST 40 09/23 AVG. MAXIMUM 80.2 77.2 3.0 AVG. MINIMUM 51.9 51.2 0.7 MEAN 66.1 64.2 1.9 DAYS MAX >= 90 3 DAYS MAX <= 32 0 DAYS MIN <= 32 0 DAYS MIN <= 0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 2.93 1986 TOTALS 0.94 0.76 0.18 DAYS >= .01 3 DAYS >= .10 1 DAYS >= .50 1 DAYS >= 1.00 0 GREATEST 24 HR. TOTAL 0.90 09/20 TO 09/20 DEGREE_DAYS HEATING TOTAL 49 110 -61 SINCE 7/1 56 137 -81 COOLING TOTAL 85 74 11 SINCE 1/1 1054 802 252 ................................................. WIND (MPH) AVERAGE WIND SPEED 5.9 RESULTANT WIND SPEED/DIRECTION 0/246 HIGHEST WIND SPEED/DIRECTION 35/190 DATE 09/19 HIGHEST GUST SPEED/DIRECTION 43/190 DATE 09/19 SKY COVER POSSIBLE SUNSHINE (PERCENT) 88 AVERAGE RH (PERCENT) 38 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. $$