Climatological Report (Monthly)
Issued by NWS Boise, ID

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 41 42 43 44 45
000
CXUS55 KBOI 110420 CCA
CLMBOI

CLIMATE REPORT...CORRECTED
NATIONAL WEATHER SERVICE BOISE ID
323 PM MST THU JAN 1 2015

...................................

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

...2ND WARMEST AND 3RD WETTEST DECEMBER AT THE BOISE AIR TERMINAL...

ONLY DECEMBER 1973 WAS WARMER. TOTAL PRECIPITATION TIED WITH 2005...
EXCEEDED ONLY BY 1996 AND 1983. A DEEP COLD UPPER LEVEL LOW OVER THE
ALEUTIANS AND GULF OF ALASKA COMBINED WITH A WARM UPPER LEVEL RIDGE
OVER THE SUBTROPICAL EASTERN PACIFIC POWERED THE STRONG WESTERLY
FLOW OF MILD BUT VERY MOIST PACIFIC AIR. THIS PROGRESSIVE PATTERN
BROUGHT WEATHER SYSTEMS INLAND ACROSS OUR AREA OFTEN ENOUGH TO
INHIBIT FORMATION OF THE TEMPERATURE INVERSIONS WHICH OFTEN KEEP
BOISE COLD DURING LATE FALL AND WINTER. BUT IT ALSO BROUGHT PERIODS
OF MODERATE TO HEAVY PRECIPITATION...MAINLY FALLING DURING THE FIRST
FOUR DAYS OF THE MONTH AND FROM THE 19TH THROUGH THE 24TH. THE
PATTERN CHANGED DRASTICALLY ON CHRISTMAS DAY AS A LARGE UPPER LEVEL
RIDGE OFF THE COAST BUILT NORTH TO ALASKA...PUTTING OUR AREA UNDER
NORTHERLY FLOW ALOFT...MAKING BOISE VULNERABLE TO COLD AIR FROM
WESTERN CANADA. BY THE 29TH MODIFIED ARCTIC AIR HAD ARRIVED...
INITIATING A PERIOD OF SUB-FREEZING TEMPERATURES.


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            63   12/11
LOWEST              9   12/31
AVG. MAXIMUM     43.8              37.5     6.3
AVG. MINIMUM     30.9              24.0     6.9
MEAN             37.4              30.7     6.7
DAYS MAX >= 90      0
DAYS MAX <= 32      3
DAYS MIN <= 32     15
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.96   1871
TOTALS           3.34              1.55    1.79
DAYS >= .01        16
DAYS >= .10         9
DAYS >= .50         2
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    1.10   12/20 TO 12/21

SNOWFALL (INCHES)
TOTALS            4.4
SINCE 7/1        12.0
GREATEST
 SNOW DEPTH         3   12/31
                        12/30
                        12/28
 24 HR TOTAL      1.7   12/27-12/28

DEGREE_DAYS
HEATING TOTAL     850              1061    -211     1264
 SINCE 7/1       1989              2315    -326
COOLING TOTAL       0                 0       0        0
 SINCE 1/1       1129               942     187
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.9
RESULTANT WIND SPEED/DIRECTION   2/142
HIGHEST WIND SPEED/DIRECTION    32/140    DATE  12/12
HIGHEST GUST SPEED/DIRECTION    44/140    DATE  12/12

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

AVERAGE RH (PERCENT)     77


-  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.