Climatological Report (Monthly)
Issued by NWS Portland, ME

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000 CXUS51 KGYX 151716 CCA CLMPWM PWMCLMPWM 000 TTAA00 KGYX 011704 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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