Climatological Report (Monthly)
Issued by NWS Portland, ME

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000 CXUS51 KGYX 021951 CLMPWM PWMCLMPWM 000 TTAA00 KGYX 021757 CLIMATE REPORT NATIONAL WEATHER SERVICE GRAY ME 157 PM EDT FRI JUN 2 2017 ................................... ...THE PORTLAND ME CLIMATE SUMMARY FOR THE MONTH OF MAY 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 94 05/31/1987 LOW 23 05/09/1956 HIGHEST 93 05/18 84 9 87 05/31 05/28 LOWEST 32 05/09 32 0 35 05/10 AVG. MAXIMUM 60.9 63.5 -2.6 63.8 AVG. MINIMUM 44.8 44.2 0.6 45.6 MEAN 52.9 53.9 -1.0 54.7 DAYS MAX >= 90 1 0.2 0.8 0 DAYS MAX <= 32 0 0.0 0.0 0 DAYS MIN <= 32 1 0.8 0.2 0 DAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 12.34 2006 MINIMUM 0.49 1965 TOTALS 5.94 4.01 1.93 2.04 DAILY AVG. 0.19 0.13 0.06 0.07 DAYS >= .01 14 12.6 1.4 13 DAYS >= .10 9 7.2 1.8 5 DAYS >= .50 6 2.6 3.4 1 DAYS >= 1.00 2 0.8 1.2 0 GREATEST 24 HR. TOTAL 2.77 05/25 TO 05/26 SNOWFALL (INCHES) RECORDS TOTAL 7.0 1945 TOTALS 0.0 0.0 0.0 0.0 SINCE 7/1 95.3 61.9 33.4 51.8 SNOWDEPTH AVG. 0 DAYS >= TRACE 0 0.0 0.0 DAYS >= 1.0 0 0.0 0.0 GREATEST SNOW DEPTH 0 05/31 24 HR TOTAL 0.0 05/31 DEGREE_DAYS HEATING TOTAL 384 353 31 327 SINCE 7/1 6520 7001 -481 6119 COOLING TOTAL 15 7 8 16 SINCE 1/1 17 7 10 16 ................................................................. WIND (MPH) AVERAGE WIND SPEED 8.4 HIGHEST WIND SPEED/DIRECTION 32/100 DATE 05/05 HIGHEST GUST SPEED/DIRECTION 41/060 DATE 05/26 SKY COVER AVERAGE SKY COVER 0.70 AVERAGE RH (PERCENT) 74 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 1 HEAVY RAIN 5 RAIN 7 LIGHT RAIN 20 FREEZING RAIN 0 LT FREEZING RAIN 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 FOG 20 FOG W/VIS <= 1/4 MILE 2 HAZE 4 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && A PERSISTENT AREA OF LOW PRESSURE DOMINATED THE WEATHER PATTERN IN NEW ENGLAND THROUGH THE FIRST HALF OF MAY. THIS BROUGHT MOSTLY COOL TEMPERATURES AND FREQUENT AFTERNOON SHOWERS ALONG WITH OCCASIONAL PERIODS OF STEADIER RAINFALL. THE FIRST DAY OF THE MONTH ONLY SAW THE TEMPERATURE REACH 44 DEGREES, THE COLDEST MAY DAY SINCE 1975. RAIN WAS OBSERVED ON 13 OF THE FIRST 15 DAYS OF THE MONTH AT PORTLAND. THE LAST FREEZE OF THE SEASON OCCURRED ON MAY 9, ABOUT A WEEK LATER THAN NORMAL. THE PESKY LOW PRESSURE AREA FINALLY MOVED OUT OF THE REGION ON THE 16TH, WITH A RIDGE OF HIGH PRESSURE BUILDING IN BEHIND IT. THIS BROUGHT A PERIOD OF MUCH WARMER WEATHER, INCLUDING THE FIRST 90 DEGREE DAY OF THE SEASON ON THE 18TH. THIS MINI-HEAT WAVE WAS BROUGHT TO AN END WHEN A COLD FRONT DROPPED DOWN FROM CANADA ON THE 19TH, BRINGING COOLER WEATHER FOR THE NEXT FEW DAYS. A NOR`EASTER MOVED UP THE COAST ON THE NIGHT OF THE 25TH, BRINGING 2.77 INCHES OF RAIN TO THE CITY IN A 24 HOUR PERIOD. THE HOLIDAY WEEKEND CLEARED OUT WITH WARM SUNNY DAYS BEFORE COLD, CLOUDY MEMORIAL DAY ON THE 29TH WITH HIGH TEMPERATURE ONLY REACHING 49 DEGREES. THE AVERAGE TEMPERATURE FOR THE MONTH WAS 52.9 DEGREES WHICH WAS 1.0 DEGREES BELOW NORMAL. THE WARMEST MAY ON RECORD WAS IN 2015 WHEN THE AVERAGE TEMPERATURE WAS 59.5 DEGREES. THE COLDEST WAS IN 1967 WHEN IT WAS ONLY 47.2 DEGREES. A TOTAL OF 5.94 INCHES OF PRECIPITATION FELL, WHICH WAS 1.93 INCHES ABOVE NORMAL. THE HEAVIEST PRECIPITATION WAS ON THE 26TH WHEN 1.74 INCHES FELL. THE WETTEST MAY ON RECORD WAS IN 2006 WHEN 12.34 INCHES WAS MEASURED. THE DRIEST WAS IN 1965 WHEN ONLY 0.49 INCHES FELL. NO SNOW FELL DURING THE MONTH. SNOWFALL IN MAY IS QUITE RARE, WITH MEASURABLE SNOW ONLY BEING OBSERVED IN 3 TIMES IN THE 136-YEAR HISTORY OF SNOWFALL OBSERVATIONS AT PORTLAND. THE MOST SNOWFALL WAS IN 1945 WHEN 7.0 INCHES FELL. THE MOST RECENT MEASURABLE SNOWFALL WAS IN 1967. THERE HAVE BEEN AN ADDITIONAL 20 YEARS WITH A TRACE OF SNOWFALL OR HAIL BEING OBSERVED, MOST RECENTLY IN 2014. THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN MAY 2017... DATE RECORD PREVIOUS 2 2 - SMALLEST TEMPERATURE RANGE 4 IN 2012 14 3 - SMALLEST TEMPERATURE RANGE 3 IN 1964 18 93 - WARMEST HIGH TEMPERATURE 82 IN 1949 18 76 - WARMEST AVERAGE TEMPERATURE 65 IN 1943 26 1.74- GREATEST PRECIPITATION 1.74 IN 1943, TIED 29 49 - COLDEST HIGH TEMPERATURE 50 IN 1984 $$ BECKER

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