Climatological Report (Monthly)
Issued by NWS Boise, ID

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
000
CXUS55 KBOI 021121
CLMBOI

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
521 AM MDT THU OCT 2 2014

...SEPTEMBER 2014...COOL AND WARM...DRY AND WET...

SEPTEMBER HAD MORE PRONOUNCED WARMING AND COOLING TRENDS THAN JULY
AND AUGUST...REFLECTING SEASONAL CHANGES IN UPPER AIR PATTERNS. THE
FIRST SIGNIFICANT RAIN SINCE EARLY MAY FELL DURING THE LAST WEEK OF
THE MONTH...FOLLOWING THREE WEEKS OF PREDOMINATELY DRY WEATHER. THE
FIRST HALF OF SEPTEMBER WAS DOMINATED BY COOL UPPER LEVEL TROUGHS...
AS AN UPPER LEVEL RIDGE REMAINED ANCHORED OFFSHORE. A PATTERN SHIFT
WHICH BEGAN ON THE 15TH RELOCATED THE RIDGE OVER THE INTERMOUNTAIN
REGION. AS A RESULT THE LAST HALF OF THE MONTH WAS WARMER THAN THE
FIRST HALF. THE MONTHLY HIGH OF 95 DEGREES OCCURRED ON THE 24TH...
THE SECOND FULL DAY OF FALL...UNDER VERY WARM SOUTHWEST FLOW ALOFT
AND SOUTHEAST SURFACE WINDS. THE 95 ON THE 24TH AND THE 93 ON THE
16TH TIED RECORDS FOR THOSE DATES. ON THE 25TH AND 26TH A DEEPENING
UPPER LEVEL TROUGH OFFSHORE...WHICH WOULD EVENTUALLY DRENCH BOISE...
CONTINUED TO DEEPEN SOUTHWARD OFF THE CALIFORNIA COAST...FAR ENOUGH
SOUTH TO PICK UP ABUNDANT TROPICAL MOISTURE. IT ENTRAINED EVEN MORE
VERY MOIST AIR AS IT MOVED INLAND OVER CALIFORNIA ON THE 27TH AND
SETTLED IN OVER NEVADA ON THE 28TH. HERE AT BOISE MOST OF THE
PRECIPITATION... NEARLY THREE QUARTERS OF AN INCH...FELL ON THE 28TH
AND 29TH AS RAIN BANDS CIRCULATING AROUND THE LOW CROSSED SOUTHERN
IDAHO AND SOUTHEAST OREGON FROM THE EAST. DURING THE ENTIRE EPISODE
FROM THE 25TH THROUGH THE END OF THE MONTH NINE TENTHS OF AN INCH OF
RAIN FELL AT THE NATIONAL WEATHER SERVICE OFFICE. THE LOW FINALLY
EXITED THE INTERMOUNTAIN REGION ON THE 30TH...KICKED OUT BY A DRIER
AND MUCH COOLER TROUGH ENTERING WESTERN CANADA FROM THE GULF OF
ALASKA.
...................................

...THE BOISE ID CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2014...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1878 TO 2014

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
HIGHEST            95   09/24
LOWEST             44   09/04
AVG. MAXIMUM     80.5              78.8     1.7
AVG. MINIMUM     54.8              51.0     3.8
MEAN             67.6              64.9     2.7
DAYS MAX >= 90      5
DAYS MAX <= 32      0
DAYS MIN <= 32      0
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         2.93   1986
TOTALS           0.92              0.58    0.34
DAYS >= .01         8
DAYS >= .10         3
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.67   09/28 TO 09/29

DEGREE_DAYS
HEATING TOTAL      52               103     -51       91
 SINCE 7/1         56               121     -65
COOLING TOTAL     136               100      36      148
 SINCE 1/1       1119               934     185
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.4
RESULTANT WIND SPEED/DIRECTION   1/288
HIGHEST WIND SPEED/DIRECTION    32/310    DATE  09/25
HIGHEST GUST SPEED/DIRECTION    39/300    DATE  09/25

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

AVERAGE RH (PERCENT)     40


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

$$


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.