Climatological Report (Monthly)
Issued by NWS Portland, ME

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CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
519 AM EDT SUN JUN 7 2015

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

...THE PORTLAND ME CLIMATE SUMMARY FOR THE MONTH OF MAY 2015...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1941 TO 2015 /FOR TEMPERATURES/
CLIMATE RECORD PERIOD 1871 TO 2015 /FOR PRECIPITATION/
CLIMATE RECORD PERIOD 1882 TO 2015 /FOR SNOWFALL/

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              94   05/31/1987
 LOW               23   05/09/1956
HIGHEST            91   05/26        84       7       81  05/12
LOWEST             38   05/02        32       6       37  05/07
AVG. MAXIMUM     71.4              63.5     7.9     64.0
AVG. MINIMUM     47.6              44.2     3.4     45.4
MEAN             59.5              53.9     5.6     54.7
DAYS MAX >= 90      1               0.2     0.8        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.8    -0.8        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        12.34   2006
 MINIMUM         0.49   1965
TOTALS           2.31              4.01   -1.70     3.87
DAILY AVG.       0.07              0.13   -0.06     0.12
DAYS >= .01         9              12.6    -3.6       16
DAYS >= .10         4               7.2    -3.2        9
DAYS >= .50         2               2.6    -0.6        2
DAYS >= 1.00        0               0.8    -0.8        1
GREATEST
 24 HR. TOTAL    0.95   05/31

SNOWFALL (INCHES)
RECORDS
 TOTAL            7.0   1945
TOTALS            0.0               0.0     0.0        T
SINCE 7/1        94.5              61.9    32.6
SNOWDEPTH AVG.      0
DAYS >= TRACE       0               0.0     0.0
DAYS >= 1.0         0               0.0     0.0
GREATEST
 SNOW DEPTH         0
 24 HR TOTAL      0.0

DEGREE_DAYS
HEATING TOTAL     206               353    -147      310
 SINCE 7/1       6932              7001     -69     7361
COOLING TOTAL      40                 7      33        0
 SINCE 1/1         40                 7      33        0
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              8.0
HIGHEST WIND SPEED/DIRECTION    30/270    DATE  05/12
HIGHEST GUST SPEED/DIRECTION    43/260    DATE  05/12

SKY COVER
AVERAGE SKY COVER           0.50

AVERAGE RH (PERCENT)     64

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     HEAVY RAIN                 1
RAIN                      7     LIGHT RAIN                 9
FREEZING RAIN             0     LT FREEZING RAIN           0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     FOG                       15
FOG W/VIS <= 1/4 MILE     4     HAZE                       3

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

&&

AFTER THE COLD WINTER AND EARLY PART OF SPRING PORTLAND FINALLY SAW
MUCH WARMER WEATHER ARRIVE IN MAY. MUCH OF THE FIRST HALF OF THE
MONTH SAW WARM AND DRY WEATHER PERIODICALLY REPELLED BY AN ONSHORE
WIND AND COOLER TEMPERATURES. THE FIRST 80 DEGREE DAY OF THE YEAR
ARRIVED ON MAY 7 WHEN THE TEMPERATURE REACHED 84 DEGREES.
TEMPERATURES FELL BACK TOWARD NORMAL LEVELS DURING THE MIDDLE OF THE
MONTH BUT MUCH WARMER AIR ARRIVED FOR THE FINAL WEEK OF THE MONTH.
THE FIRST 90 DEGREE READING OF THE YEAR CAME ON MAY 26 WHEN THE
TEMPERATURE REACHED 91 DEGREES. THIS RESULTED IN THE WARMEST MAY ON
RECORD AT PORTLAND.

THE AVERAGE TEMPERATURE FOR THE MONTH WAS 59.5 DEGREES WHICH WAS 5.6
DEGREES ABOVE NORMAL AND THE WARMEST MAY ON RECORD AT THE PORTLAND
JETPORT. THE PREVIOUS WARMEST MAY WAS 1991 WHEN THE AVERAGE
TEMPERATURE WAS 58.1 DEGREES. THE COOLEST WAS 1967 AT 47.3 DEGREES.
THE FOLLOWING TABLE LISTS THE WARMEST MAYS ON RECORD AT PORTLAND.

WARMEST AVERAGE TEMPERATURE FOR MAY /SINCE 1941/
RANK  TEMP  YEAR
1     59.5  2015 <===
2     58.1  1991
3     57.9  2010
4     56.8  1998
5     56.6  2012
6     56.2  1959
7     56.0  2007
      56.0  1955
9     55.7  1970
      55.7  1944

THE FIRST 90 DEGREE TEMPERATURE OCCURRED ON MAY 26, ABOUT 3 WEEKS
EARLIER THAN NORMAL. THIS WAS THE EARLIEST 90 DEGREE READING SINCE
2009 WHEN THE TEMPERATURE REACHED 90 ON APRIL 28, THE EARLIEST ON
RECORD. IN 2014 PORTLAND DID NOT REACH 90 THE ENTIRE YEAR.

THERE WERE 8 DAYS IN MAY THAT REACHED 80 DEGREES. THIS WAS THE
SECOND MOST ON RECORD. THE FOLLOWING TABLE LISTS THE MOST 80 DEGREE
DAYS IN THE MONTH OF MAY AT THE PORTLAND JETPORT.

DAYS 80 DEGREES OR HIGHER IN MAY /SINCE 1941/
RANK  DAYS  YEAR
1     9     1991
2     8     2015 <===
3     7     1959
4     6     1957
      6     1955
6     5     1987
      5     1977

A TOTAL OF 2.31 INCHES OF RAIN FELL WHICH WAS 1.70 INCHES BELOW
NORMAL. THE HEAVIEST RAIN FELL ON THE 31ST WHEN 0.95 INCHES WAS
MEASURED. THIS WAS THE DRIEST MAY SINCE 2010. THE WETTEST MAY ON
RECORD WAS 2006 WHEN 12.34 INCHES FELL. THE DRIEST WAS 1965 WITH
ONLY 0.49 INCHES.

NO SNOW FELL IN MAY. SNOW IS EXTREMELY RARE IN MAY AT PORTLAND.
SINCE SNOWFALL RECORDS BEGAN IN 1882 ONLY 3 YEARS RECORDED
MEASURABLE SNOW IN THE MONTH OF MAY. THE MOST RECENT WAS IN 1967
WHEN 0.1 INCHES FELL. THE HEAVIEST SNOW IN MAY WAS 1945 WHEN 7.0
INCHES FELL.

THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN MAY 2015...
DATE  RECORD                              PREVIOUS
5     51   - WARMEST LOW TEMPERATURE      51 IN 2000 /TIED/
7     84   - WARMEST HIGH TEMPERATURE     81 IN 1957
7     65   - WARMEST AVERAGE TEMPERATURE  62 IN 2000
26    91   - WARMEST HIGH TEMPERATURE     91 IN 2010 /TIED/
26    75   - WARMEST AVERAGE TEMPERATURE  73 IN 2010 AND 1981
27    63   - WARMEST LOW TEMPERATURE      58 IN 1981
27    71   - WARMEST AVERAGE TEMPERATURE  70 IN 1981, 1959, AND 1944
28    64   - WARMEST LOW TEMPERATURE      58 IN 1944
28    72   - WARMEST AVERAGE TEMPERATURE  72 IN 1959 AND 1944

$$

KIMBLE


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