Climatological Report (Monthly)
Issued by NWS Boise, ID

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CXUS55 KBOI 011734
CLMBOI

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
1030 AM MST THU FEB 1 2018

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

...THE BOISE ID CLIMATE SUMMARY FOR THE MONTH OF JANUARY 2018...

JANUARY 2018 WAS THE FOURTH WARMEST ON RECORD AT THE BOISE AIRPORT.
FOR ALL BOISE LOCATIONS IT TIED JANUARY 1914 FOR SIXTH PLACE. THE
MONTHLY AVERAGE OF 37.8 DEGREES WAS 6.5 DEGREES ABOVE NORMAL, AND IT
EVEN EXCEEDED FEBRUARY`S NORMAL OF 36.5 DEGREES. ONLY THE FIRST FOUR
DAYS OF THE MONTH WERE BELOW NORMAL.

IT IS NOTEWORTHY THAT, PRIOR TO THIS YEAR, THE TOP FIVE WARMEST
JANUARYS AT THE AIRPORT OCCURRED DURING EL NINO WINTERS, AND THREE
OF THOSE WERE STRONG EL NINOS. JANUARY 2018 DIDN`T FIT THE PATTERN,
AS A WEAK LA NINA WAS IN EFFECT.

THERE WERE TWO RECORD HIGHS, EACH OCCURRING AHEAD OF STRONG COLD
FRONTS. THE 58 ON THE 18TH AND THE 59 ON THE 30TH BROKE THE PREVIOUS
DAILY RECORDS OF 57 IN 1998 AND 56 IN 1992.

THE UNUSUALLY MILD TEMPERATURES RESULTED FROM A COMBINATION OF A
PROGRESSIVE PATTERN AND A PERSISTENT WARM UPPER LEVEL HIGH PRESSURE
RIDGE OVER THE WESTERN U.S.

WESTERLY FLOW ALOFT BROUGHT MILD MOIST PACIFIC WEATHER SYSTEMS
INLAND ACROSS THE NORTHERN INTERMOUNTAIN REGION, TEMPORARILY
DISPLACING THE RIDGE, WHICH ALWAYS MANAGED TO REBUILD. THE ACTIVE
PATTERN HINDERED THE FORMATION OF TEMPERATURES INVERSIONS AND
BLOCKED INVASIONS OF COLD AIR FROM WESTERN CANADA.

PRECIPITATION TOTALED 1.36 INCHES, CLOSE TO THE JANUARY NORMAL OF
1.39 INCHES. MOST OF IT FELL DURING TWO EPISODES.

ON THE 9TH A COLD FRONT PRODUCED NEARLY HALF AN INCH OF RAIN AT THE
AIRPORT.

DURING THE AFTERNOON OF THE 19TH ANOTHER COLD FRONT GENERATED NEARLY
A QUARTER INCH OF RAIN. THE UPPER LEVEL LOW PRESSURE TROUGH WHICH
FOLLOWED THE FRONT BROUGHT AN ADDITIONAL TWO TENTHS OF AN INCH OF
RAIN.

ON THE 30TH THE LAST COLD FRONT OF THE MONTH PASSED THE AIRPORT AT
1:40 PM MST, WITH A WIND GUST OF 34 MPH FROM THE NORTHWEST, BUT NO
PRECIPITATION.

THE ONLY MEASURABLE SNOWFALL WAS 0.1 INCH ON THE 25TH. THE TOTAL FOR
JANUARY 2017 WAS 21.5 INCHES. NORMAL IS 5.1 INCHES.

THERE HAVE BEEN JANUARYS WITH LESS SNOW. ONLY TRACES FELL IN 1934,
1961, AND 2003.

DENSE FOG WAS OBSERVED ON FIVE DAYS.

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1875 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
HIGHEST            59   01/30
LOWEST             18   01/02
AVG. MAXIMUM     45.4              37.8     7.6
AVG. MINIMUM     30.2              24.7     5.5
MEAN             37.8              31.3     6.5
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32     19
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.29   1875
TOTALS           1.36              1.24    0.12
DAYS >= .01        13
DAYS >= .10         3
DAYS >= .50         0
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.46   01/09 TO 01/09

SNOWFALL (INCHES)
TOTALS            0.1
SINCE 7/1         9.9
GREATEST
 SNOW DEPTH         2   01/01
 24 HR TOTAL      0.1   01/25 TO 01/25

DEGREE_DAYS
HEATING TOTAL     835              1046    -211     1345
 SINCE 7/1       3179              3361    -182
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.7
RESULTANT WIND SPEED/DIRECTION   3/141
HIGHEST WIND SPEED/DIRECTION    28/320    DATE  01/30
HIGHEST GUST SPEED/DIRECTION    39/310    DATE  01/11

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

AVERAGE RH (PERCENT)     73


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

$$


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