Climatological Report (Monthly)
Issued by NWS Boise, ID

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CXUS55 KBOI 011740
CLMBOI

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
1030 AM MST MON FEB 1 2016

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

THE FIRST TWO DAYS OF JANUARY MARKED THE END OF A COLD SPELL WHICH
BEGAN THE DAY BEFORE CHRISTMAS. TEMPERATURES BOTH DAYS AVERAGED
NEARLY 20 DEGREES BELOW NORMAL. THE LOW OF 4 ABOVE ON THE 2ND COULD
VERY WELL BE THE LOW FOR THE WINTER. A 1-INCH SNOW COVER ENHANCED
OVERNIGHT COOLING UNDER CLEAR SKIES. A WARM RIDGE OF HIGH PRESSURE
ALOFT TRAPPED THE COLD AIR...FORMING A DEEP INVERSION. TEMPERATURES
WERE AROUND 15 DEGREES WARMER 5000 FEET ABOVE THE VALLEY FLOOR.

TEMPERATURES BEGAN TO MODERATE ON THE 3RD AS THE HIGH PRESSURE
WEAKENED AND THE INVERSION ERODED AWAY. FROM THE 4TH THROUGH THE END
OF THE MONTH TEMPERATURES AVERAGED ABOVE NORMAL ON ALL BUT THREE
DAYS.

FROM THE 7TH THROUGH THE 12TH WESTERLY FLOW ALOFT SPLIT OVER THE
COAST...CAUSING WEATHER SYSTEMS TO MOVE INLAND NORTH AND SOUTH OF
OUR AREA. THERE WAS NO RAIN OR SNOW AT BOISE DURING THAT PERIOD.

BY THE 13TH THE FLOW HAD RECONSOLIDATED...ENABLING PRECIPITATION TO
AGAIN REACH BOISE. A SERIES OF WEATHER SYSTEMS BROUGHT A WEEK OF WET
WEATHER...INCLUDING 2 INCHES OF SNOW ON THE 14TH AND 15TH.

FROM THE 19TH THROUGH THE 27TH AN UPPER LEVEL HIGH PRESSURE RIDGE
DOMINATED THE WESTERN U.S. THE ONLY MEASURABLE PRECIPITATION AT
BOISE WAS A HUNDREDTH OF AN INCH ON THE 23RD FROM A WEATHER SYSTEM
WHICH WAS WEAKENED BY THE RIDGE.

STARTING ON THE 28TH VERY MOIST WESTERLY FLOW REPLACED THE RIDGE...
BRINGING WIDESPREAD PRECIPITATION TO SOUTHWEST IDAHO. RAIN ON THE
28TH AND 29TH TOTALED A THIRD OF AN INCH AT THE AIRPORT.

THE RAIN ENDED LATE ON THE 29TH AFTER A COLD FRONT CROSSED THE AREA.
COLD MOIST AND UNSTABLE AIR FOLLOWED THE FRONT...AND ON THE 30TH A
COMBINATION OF AFTERNOON HEATING AT THE SURFACE AND COLD AIR ALOFT
TRIGGERED CONVECTIVE SNOW SHOWERS.

BY EARLY MORNING ON THE 31ST COLD AIR HAD SETTLED INTO THE VALLEY...
AND AREAS OF DENSE FOG FORMED FROM MOISTURE LEFT OVER FROM THE
SHOWERS OF THE PREVIOUS THREE DAYS. THE FOG LIFTED DURING THE
AFTERNOON FORMING A LOW CLOUD COVER WHICH PREVENTED TEMPERATURES
FROM RISING ABOVE 34. THE AVERAGE TEMPERATURE THAT DAY WAS BELOW
NORMAL FOR THE FIRST TIME SINCE THE 11TH.

...THE BOISE ID CLIMATE SUMMARY FOR THE MONTH OF JANUARY 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1878 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
HIGHEST            50   01/23
LOWEST              4   01/02
AVG. MAXIMUM     40.2              37.8     2.4
AVG. MINIMUM     26.9              24.7     2.2
MEAN             33.6              31.3     2.3
DAYS MAX >= 90      0
DAYS MAX <= 32      2
DAYS MIN <= 32     24
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.29   1875
TOTALS           0.83              1.24   -0.41
DAYS >= .01        11
DAYS >= .10         4
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.22   01/28 TO 01/29
                        01/29 TO 01/29
                        01/29 TO 01/30

SNOWFALL (INCHES)
TOTALS            2.2
SINCE 7/1        10.2
GREATEST
 SNOW DEPTH         2   01/15
 24 HR TOTAL      1.6   01/14 TO 01/14

DEGREE_DAYS
HEATING TOTAL     966              1046     -80     1024
 SINCE 7/1       3061              3361    -300
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.1
RESULTANT WIND SPEED/DIRECTION   3/137
HIGHEST WIND SPEED/DIRECTION    28/120    DATE  01/22
HIGHEST GUST SPEED/DIRECTION    39/140    DATE  01/19

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.

$$



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