Climatological Report (Monthly)
Issued by NWS Portland, ME

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CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
530 PM EDT TUE MAY 1 2018

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

...THE PORTLAND ME CLIMATE SUMMARY FOR THE MONTH OF APRIL 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1941 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              92   04/28/2009
 LOW                8   04/04/1954
HIGHEST            67   04/26        75      -8       86  04/16
LOWEST             23   04/06        24      -1       26  04/03
AVG. MAXIMUM     50.2              53.3    -3.1     56.1
AVG. MINIMUM     33.4              34.7    -1.3     37.3
MEAN             41.8              44.0    -2.2     46.7
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.2    -0.2        0
DAYS MIN <= 32     16              10.4     5.6        8
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         9.90   1973
 MINIMUM         0.28   1999
TOTALS           5.83              4.32    1.51     6.40
DAILY AVG.       0.19              0.14    0.05     0.21
DAYS >= .01        14              11.2     2.8       11
DAYS >= .10         9               7.0     2.0        9
DAYS >= .50         3               2.9     0.1        5
DAYS >= 1.00        2               1.0     1.0        3
GREATEST
 24 HR. TOTAL    2.40   04/16 TO 04/16

SNOWFALL (INCHES)
RECORDS
 TOTAL           20.5   1906
TOTALS            0.7               2.8    -2.1      7.9
SINCE 7/1        91.9              61.9    30.0     95.3
SNOWDEPTH AVG.      0
DAYS >= TRACE       8               1.0     7.0
DAYS >= 1.0         0               0.6    -0.6
GREATEST
 SNOW DEPTH         0
 24 HR TOTAL      0.5   04/06

DEGREE_DAYS
HEATING TOTAL     690               630      60      543
 SINCE 7/1       6350              6648    -298     6135
COOLING TOTAL       0                 0       0        2
 SINCE 1/1          0                 0       0        2
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              9.4
HIGHEST WIND SPEED/DIRECTION    37/090    DATE  04/16
HIGHEST GUST SPEED/DIRECTION    52/060    DATE  04/16

SKY COVER
AVERAGE SKY COVER           0.60

AVERAGE RH (PERCENT)     66


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

&&

THE SPRING-LIKE WARMTH THAT FINALLY ARRIVED AT THE END OF MARCH MADE
A SWIFT DEPARTURE ONCE APRIL CAME AROUND. SEVERAL BACK TO BACK
TROUGHS OF LOW PRESSURE BROUGHT COLD AIR IN FROM CANADA, WITH THE
APRIL SUN TRIGGERING AFTERNOON SHOWERS. THE FIRST WEEK OF APRIL SAW
FREQUENT SNOW SHOWERS, THOUGH THE SNOW RARELY ACCUMULATED OR STUCK
AROUND. THE HEAVIEST SNOW FELL ON APRIL 6 WHEN 0.5 INCHES WAS
MEASURED. AFTER A BRIEF WARM UP BROUGHT 60 DEGREE WARMTH, MORE COLD
AIR POURED IN FOR THE MIDDLE OF THE MONTH. THE COLDEST DAY WAS APRIL
15 WHEN THE TEMPERATURE WAS BELOW FREEZING ALL DAY, ONLY SNEAKING UP
TO 33 DEGREES JUST BEFORE MIDNIGHT. SLEET AND FREEZING RAIN FELL
MOST OF THE DAY, LEAVING AN ICY COATING THAT IS QUITE UNCOMMON FOR
THIS LATE IN THE SEASON. THE HIGH TEMPERATURE OF 33 ON APRIL 15 WAS
THE COLDEST HIGH TEMPERATURE ON RECORD FOR SO LATE IN THE SEASON.
HEAVY RAIN MOVED IN ON THE 16TH WHEN MORE THAN 2 INCHES OF RAIN FELL
WITH TEMPERATURES WARMING UP JUST A BIT, BUT STAYING BELOW NORMAL.
WARMER, SPRING-LIKE WEATHER FINALLY ARRIVED AGAIN BY THE END OF
APRIL, WITH 6 OUT OF 7 DAYS TOPPING 60 DEGREES FROM THE 22ND THRU
28TH.

THE AVERAGE TEMPERATURE FOR THE MONTH WAS 41.8 DEGREES WHICH WAS 2.2
DEGREES BELOW NORMAL AND THE COLDEST APRIL SINCE 2003. THE COLDEST
APRIL ON RECORD WAS IN 1943 WHEN THE AVERAGE TEMPERATURE WAS 38.4
DEGREES. THE WARMEST WAS IN 2010 AT 48.8 DEGREES.

A TOTAL OF 5.83 INCHES OF PRECIPITATION FELL WHICH WAS 1.51 INCHES
ABOVE NORMAL. THE HEAVIEST FELL ON APRIL 16 WHEN 2.40 INCHES WAS
RECORDED. THE WETTEST APRIL ON RECORD WAS IN 1973 WHEN 9.90 INCHES
WAS RECORDED. THE DRIEST WAS IN 1999 WHEN ONLY 0.28 INCHES FELL.

ALTHOUGH SNOW WAS OBSERVED ON 8 DAYS IN APRIL, ONLY 0.7 INCHES WAS
MEASURED WHICH WAS 2.1 INCHES BELOW NORMAL. IN FACT, IT WAS THE
LEAST SNOWY APRIL SINCE 2013. SNOWFALL IN APRIL IS OFTEN VARIABLE.
THE SNOWIEST APRIL WAS IN 1906 WHEN 20.5 INCHES FELL. THERE HAVE
BEEN 10 YEARS THAT HAD NO SNOW IN APRIL, INCLUDING MOST RECENTLY IN
2009. AN ADDITIONAL 28 YEARS OBSERVED ONLY A TRACE OF SNOW IN APRIL,
MOST RECENTLY IN 2012. THUS, ACCUMULATING SNOW FALLS IN APRIL IN 72
PERCENT OF YEARS.

THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN APRIL 2018...
DATE  RECORD                                PREVIOUS
15    33   - COLDEST HIGH TEMPERATURE       37 IN 1979
15    30   - COLDEST AVERAGE TEMPERATURE    30 IN 1943
25    1.31 - GREATEST PRECIPITATION         0.84 IN 1968

$$

KIMBLE



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