Climatological Report (Monthly)
Issued by NWS Portland, ME

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CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
318 PM EDT MON MAY 1 2017

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

...THE PORTLAND ME CLIMATE SUMMARY FOR THE MONTH OF APRIL 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1941 TO 2017 /FOR TEMPERATURES/
CLIMATE RECORD PERIOD 1871 TO 2017 /FOR PRECIPITATION/
CLIMATE RECORD PERIOD 1882 TO 2017 /FOR SNOWFALL/

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            86   04/16        75      11       68  04/22
                                                          04/21
LOWEST             26   04/03        24       2       17  04/06
                                                          04/04
AVG. MAXIMUM     56.1              53.3     2.8     53.4
AVG. MINIMUM     37.2              34.7     2.5     32.0
MEAN             46.7              44.0     2.7     42.7
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.2    -0.2        1
DAYS MIN <= 32      8              10.4    -2.4       16
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         9.90   1973
 MINIMUM         0.28   1999
TOTALS           6.40              4.32    2.08     1.56
DAILY AVG.       0.21              0.14    0.07     0.05
DAYS >= .01        11              11.2    -0.2       12
DAYS >= .10         9               7.0     2.0        4
DAYS >= .50         5               2.9     2.1        0
DAYS >= 1.00        3               1.0     2.0        0
GREATEST
 24 HR. TOTAL    1.83   04/06

SNOWFALL (INCHES)
RECORDS
 TOTAL           20.5   1906
TOTALS            7.9               2.8     5.1      3.7
SINCE 7/1        95.3              61.9    33.4     51.8
SNOWDEPTH AVG.      1
DAYS >= TRACE       6               1.0     5.0
DAYS >= 1.0         1               0.6     0.4
GREATEST
 SNOW DEPTH         8   04/01
 24 HR TOTAL      7.9   04/01

DEGREE_DAYS
HEATING TOTAL     543               630     -87      665
 SINCE 7/1       6135              6648    -513     5792
COOLING TOTAL       2                 0       2        0
 SINCE 1/1          2                 0       2        0
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              8.2
HIGHEST WIND SPEED/DIRECTION    25/070    DATE  04/06
HIGHEST GUST SPEED/DIRECTION    38/340    DATE  04/29

SKY COVER
AVERAGE SKY COVER           0.60

AVERAGE RH (PERCENT)     72

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     HEAVY RAIN                 2
RAIN                      5     LIGHT RAIN                13
FREEZING RAIN             0     LT FREEZING RAIN           0
HEAVY SNOW                0     SNOW                       2
LIGHT SNOW                4     FOG                       17
FOG W/VIS <= 1/4 MILE     6     HAZE                       0

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

&&

THE COOL WEATHER THAT HAD PERSISTED THROUGH MUCH OF MARCH CONTINUED
INTO THE FIRST PART OF APRIL. IN FACT, A SIGNIFICANT SNOWSTORM
BROUGHT MORE THAN 10 INCHES OF SNOW FROM MARCH 31 INTO APRIL 1.
RATHER THAN BEING A SIGN OF A COLD APRIL TO COME, THIS WAS JUST
NATURE`S IDEA OF A PRANK. AFTER A FEW DAYS OF COOL, WET WEATHER,
INCLUDING NEARLY 2 INCHES OF RAIN ON APRIL 6TH, THE WEATHER PATTERN
BEGAN TO SHIFT AND WARMER TEMPERATURES BEGAN TO ARRIVE AND THE
WINTER SNOW COVER FINALLY MELTED. THE TEMPERATURE PEAKED AT 76 ON
APRIL 11 BEFORE A COLD FRONT COOLED THINGS DOWN A BIT THE NEXT FEW
DAYS. THE WARMTH BUILT UP AGAIN AND CULMINATED IN A RECORD HIGH OF
86 DEGREES ON EASTER SUNDAY, APRIL 16. THIS WAS THE EARLIEST 80
DEGREE TEMPERATURE OBSERVED IN PORTLAND SINCE MARCH 22, 2012.
NORMALLY THE FIRST 80 DEGREE TEMPERATURE IS NOT OBSERVED FOR ANOTHER
4 WEEKS. A COLD FRONT BROUGHT SOME RELIEF FROM THE SUMMER-LIKE HEAT
THE NEXT DAY. A COOL ONSHORE BREEZE FROM THE FRIGID GULF OF MAINE
SOON FOLLOWED AND LASTED FOR SEVERAL DAYS, HOLDING TEMPERATURES
BELOW NORMAL FOR ABOUT A WEEK. THE REST OF THE MONTH WAS A BATTLE
BETWEEN THE BUILDING WARMTH IN THE INTERIOR AND THE COOL INFLUENCE
OF THE GULF OF MAINE. WHEN WINDS TURNED EAST IT STAYED COOL, BUT
PERIODIC WESTERLY BREEZES BROUGHT MUCH WARMER AIR INCLUDING ANOTHER
DAY OF 80 DEGREE TEMPERATURES ON APRIL 29.

THE AVERAGE TEMPERATURE FOR THE MONTH WAS 46.7 DEGREES WHICH WAS 2.7
DEGREES ABOVE NORMAL AND TIED FOR THE 4TH WARMEST APRIL ON RECORD.
THE WARMEST APRIL WAS IN 2010 WHEN THE AVERAGE TEMPERATURE WAS 48.8
DEGREES. THE COLDEST WAS IN 1943 WHEN IT WAS ONLY 38.4 DEGREES. THE
FOLLOWING TABLE LISTS THE WARMEST APRILS ON RECORD AT PORTLAND.

WARMEST AVERAGE TEMPERATURE IN APRIL AT PORTLAND (SINCE 1940)...
RANK  TEMP  YEAR
1     48.8  2010
2     47.1  1945
3     47.0  2012
4     46.7  2017 <===
      46.7  2009
6     46.5  1986
      46.5  1941
8     45.9  1991
9     45.8  1998
10    45.7  2006

THERE WERE 13 DAYS THIS APRIL, NEARLY HALF THE MONTH, WHICH SAW THE
TEMPERATURE RISE INTO THE 60S OR HIGHER. ON AVERAGE THERE ARE ONLY 7
SUCH DAYS IN APRIL. THE FOLLOWING TABLE LISTS THE APRILS WITH THE
MOST DAYS REACHING 60 DEGREES OR HIGHER.

DAYS TEMPERATURE EXCEEDED 60 DEGREES IN APRIL (SINCE 1940)...
RANK  DAYS  YEAR
1      18   2010
2      13   2017 <===
       13   1981
4      12   1991
       12   1968
6      11   1986
7      10   2015 AND 6 OTHER YEARS

A TOTAL OF 6.40 INCHES OF PRECIPITATION FELL WHICH WAS 2.08 INCHES
ABOVE NORMAL AND THE WETTEST APRIL SINCE 2007.  THE HEAVIEST
PRECIPITATION FELL ON APRIL 6 WHEN 1.83 INCHES WAS RECORDED. THE
WETTEST APRIL ON RECORD WAS IN 1973 WHEN 9.90 INCHES WAS MEASURED.
THE DRIEST WAS IN 1999 WHEN ONLY 0.28 INCHES FELL.

THERE WAS 7.9 INCHES OF SNOWFALL WHICH IS 5.1 INCHES ABOVE NORMAL
AND THE SNOWIEST APRIL SINCE 2007. ALL OF THIS SNOW FELL ON APRIL 1
AS PART OF A SNOWSTORM WHICH DROPPED 10.9 INCHES FROM MARCH 31 INTO
APRIL 1. SNOWFALL IS TYPICALLY RATHER INCONSISTENT IN APRIL. THE
SNOWIEST APRIL ON RECORD WAS IN 1906 WHEN 20.5 INCHES WAS MEASURED.
MEASURABLE SNOW HAS BEEN OBSERVED IN 71 PERCENT OF ALL APRILS, WHILE
AN ADDITIONAL 21 PERCENT OBSERVED ONLY A TRACE OF SNOWFALL, MOST
RECENTLY IN 2012. THERE HAVE ONLY BEEN 10 YEARS, OR 7 PERCENT OF ALL
APRILS WHICH OBSERVED NO SNOWFALL, INCLUDING MOST RECENTLY IN 2009.

THE SNOWSTORM ON MARCH 31 INTO APRIL 1 WAS THE 9TH LARGEST APRIL
SNOWSTORM ON RECORD. THE FOLLOWING TABLE LISTS THE LARGEST
SNOWSTORMS IN APRIL.

LARGEST SNOWSTORMS IN APRIL (SINCE 1881)...
RANK  SNOW  DATES
1     16.2  3/31-4/2/1922
2     15.9  4/6-7/1982
      15.9  4/6-7/1882
4     15.0  4/10/1906
5     13.7  4/8-10/1907
6     12.5  4/2/1887
7     11.7  4/4-5/2007
8     11.6  4/12-13/1933
9     10.9  3/31-4/1/2017 <===
10    10.7  4/19-20/1925

THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN APRIL 2017...
DATE  RECORD                                 PREVIOUS
1     34 - COLDEST HIGH TEMPERATURE          34 IN 2001 /TIED/
1     2 - SMALLEST TEMPERATURE RANGE         3 IN 2011 AND 2001
11    35 - GREATEST TEMPERATURE RANGE        35 IN 1947 AND 1945 /TIED/
16    86 - WARMEST HIGH TEMPERATURE          78 IN 1976
16    67 - WARMEST AVERAGE TEMPERATURE       62 IN 2012 AND 1976
21    3 - SMALLEST TEMPERATURE RANGE         4 IN 1943

$$

KIMBLE



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