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 41 42 43 44 45 46 47 48 49 50
746
CXUS55 KBOI 012352
CLMBOI

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOISE ID
1225 PM MDT SUN APR 1 2018

THE CHANGEABLE WEATHER OF MARCH 2018 WAS TYPICAL OF LATE WINTER AND
EARLY SPRING. THE PROGRESSION OF LOW PRESSURE TROUGHS AND HIGH
PRESSURE RIDGES BROUGHT ALTERNATING PERIODS OF WARM AND COLD
TEMPERATURES, YIELDING A CLOSE-TO-NORMAL AVERAGE. THERE WERE NO
RECORD HIGHS OR LOWS.

EPISODES OF ACTIVE WEATHER AND MODERATE PRECIPITATION OCCURRED AS
EACH TROUGH AND ITS ACCOMPANYING COLD FRONT ENTERED OUR AREA.

THE .54 INCH RAINFALL ON THE 14TH TIED THE RECORD FOR THE DATE SET
IN 1927. THE 1.89 INCHES FOR THE MONTH WAS .50 INCH ABOVE NORMAL AND
RANKS IN THE WETTEST 20 PERCENT OF MARCHES AT THE AIRPORT, AND THE
WETTEST 25 PERCENT AT ALL BOISE LOCATIONS.

SNOWFALL FOR THE MONTH WAS 2.6 INCHES, MOSTLY FALLING ON THE MORNING
OF THE 25TH. THE MONTHLY NORMAL IS 1.3 INCHES.

THE FIRST FOUR DAYS OF MARCH WERE DOMINATED BY AN UPPER LEVEL TROUGH
WHICH BROUGHT COLD TEMPERATURES BUT LITTLE PRECIPITATION. THE 23
DEGREES ON THE 4TH WAS THE LOW FOR THE MONTH.

TEMPERATURES ROSE ABOVE NORMAL ON THE 8TH AS AN UPPER LEVEL RIDGE
BEGAN TO BUILD OVER THE REGION.

THE RIDGE REACHED ITS MAXIMUM AMPLITUDE ON THE 12TH, ALLOWING
TEMPERATURES TO RISE INTO THE LOW 60S. AS THE RIDGE BEGAN TO EXIT,
SOUTHERLY FLOW AHEAD OF THE NEXT UPSTREAM TROUGH PUSHED THE
TEMPERATURE TO 69 ON THE 13TH, THE HIGH FOR THE MONTH.

THE TROUGH SENT A STRONG COLD FRONT INLAND, AND CONVECTIVE SHOWERS
AHEAD OF THE FRONT WERE PRECEDED BY NORTHWEST WINDS GUSTING OVER 30
MPH. WHEN THE SHOWERS REACHED THE BOISE AIRPORT JUST AFTER 4 AM,
MODERATE RAIN BEGAN AND PERSISTED FOR ABOUT AN HOUR BEFORE TAPERING
OFF AND ENDING. THE TROUGH DRIFTED SLOWLY INLAND ON THE 16TH AND
17TH, PREVENTING TEMPERATURES FROM RISING ABOVE THE UPPER 40S ON
THOSE DAYS.

THE LAST WEATHER MAKER OF THE MONTH WAS ANOTHER STRONG UPPER LEVEL
TROUGH WHICH STALLED OFF THE COAST OF BRITISH COLUMBIA ON THE 22ND.
THIS TROUGH EXTENDED FAR ENOUGH SOUTH TO TAP SUBTROPICAL MOISTURE.
LIKE ITS PREDECESSOR, MODERATE RAIN PRECEDED THE COLD FRONT ON THE
AFTERNOON OF THE 22ND. THE FRONT PASSED THE AIRPORT AT ABOUT 7:30
PM, ACCOMPANIED BY THE FIRST THUNDERSTORM OF THE SPRING SEASON. THE
STRONGEST CONVECTION AND HEAVIEST RAIN STAYED WEST AND NORTH OF
BOISE.

AS THE TROUGH MOVED INLAND AND WEAKENED ON THE 25TH, IT PRODUCED THE
LAST MEASURABLE PRECIPITATION OF THE MONTH, FALLING AS 2.1 INCHES OF
SNOW. THE COLD NORTH PACIFIC AIR WAS RESPONSIBLE FOR A HIGH OF ONLY
45 THAT DAY, THE CHILLIEST MAXIMUM SINCE THE START OF SPRING.

FOLLOWING THIS SYSTEM, WEST-NORTHWEST FLOW ALOFT RETURNED
TEMPERATURES TO NEAR NORMAL FROM THE 28TH THROUGH THE 31ST.

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

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

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            69   03/13
LOWEST             23   03/04
AVG. MAXIMUM     53.8              54.6    -0.8
AVG. MINIMUM     34.4              34.4     0.0
MEAN             44.1              44.5    -0.4
DAYS MAX >= 90      0
DAYS MAX <= 32      0
DAYS MIN <= 32     11
DAYS MIN <= 0       0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         7.66   1871
TOTALS           1.89              1.39    0.50
DAYS >= .01        13
DAYS >= .10         6
DAYS >= .50         1
DAYS >= 1.00        0
GREATEST
 24 HR. TOTAL    0.54   03/14 TO 03/14

SNOWFALL (INCHES)
TOTALS            2.6
SINCE 7/1        19.9
GREATEST
 SNOW DEPTH         1   03/01
 24 HR TOTAL      2.1   03/25 TO 03/25

DEGREE_DAYS
HEATING TOTAL     640               636       4      492
 SINCE 7/1       4641              4795    -154
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              8.8
RESULTANT WIND SPEED/DIRECTION   4/126
HIGHEST WIND SPEED/DIRECTION    32/140    DATE  03/02
HIGHEST GUST SPEED/DIRECTION    41/140    DATE  03/21

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM

AVERAGE RH (PERCENT)     58


-  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.