Climatological Report (Seasonal)
Issued by NWS Portland, ME
Issued by NWS Portland, ME
Versions:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
866 CXUS51 KGYX 031546 CLSPWM PWMCLMPWM 000 TTAA00 KGYX 021609 CLIMATE REPORT NATIONAL WEATHER SERVICE GRAY ME 1146 AM EDT TUE SEP 3 2019 ................................... ...THE PORTLAND ME CLIMATE SUMMARY FOR THE SUMMER SEASON, FROM 6/1/2019 TO 8/31/2019... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1941 TO 2019 /FOR TEMPERATURES/ CLIMATE RECORD PERIOD 1871 TO 2019 /FOR PRECIPITATION/ CLIMATE RECORD PERIOD 1882 TO 2019 /FOR SNOWFALL/ WEATHER OBSERVED NORMAL DEPART LAST YEAR`S VALUE DATE(S) VALUE FROM VALUE DATE(S) NORMAL ................................................................ TEMPERATURE (F) RECORD HIGH 103 08/02/1975 LOW 33 08/31/1965 06/04/1944 HIGHEST 94 07/21 93 1 93 08/28 08/06 08/07 LOWEST 47 08/26 42 5 46 06/09 06/09 06/04 06/04 06/05 AVG. MAXIMUM 77.8 76.6 1.2 78.3 AVG. MINIMUM 58.8 57.1 1.7 59.4 MEAN 68.3 66.9 1.4 68.9 DAYS MAX >= 90 4 3.9 0.1 6 DAYS MAX <= 32 0 0.0 0.0 0 DAYS MIN <= 32 0 0.0 0.0 0 DAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 22.31 2009 MINIMUM 4.10 1999 TOTALS 12.85 10.54 2.31 10.72 DAILY AVG. 0.14 0.11 0.03 0.12 DAYS >= .01 32 32.1 -0.1 29 DAYS >= .10 23 18.7 4.3 17 DAYS >= .50 11 6.4 4.6 9 DAYS >= 1.00 2 2.4 -0.4 4 GREATEST 24 HR. TOTAL 1.91 08/21 SNOWFALL (INCHES) RECORDS TOTAL 0.0 TOTALS 0.0 0.0 0.0 0.0 SINCE 7/1 0.0 0.0 0.0 0.0 SNOWDEPTH AVG. 0 DAYS >= TRACE 0 0.0 0.0 0 DAYS >= 1.0 0 0.0 0.0 0 GREATEST SNOW DEPTH 0 24 HR TOTAL 0.0 DEGREE_DAYS HEATING TOTAL 106 151 -45 101 SINCE 7/1 13 45 -32 6 COOLING TOTAL 433 321 112 481 SINCE 1/1 436 328 108 496 ................................................................. WIND (MPH) AVERAGE WIND SPEED 6.2 HIGHEST WIND SPEED/DIRECTION 28/320 DATE 06/22 HIGHEST GUST SPEED/DIRECTION 40/330 DATE 06/22 SKY COVER AVERAGE SKY COVER 0.50 AVERAGE RH (PERCENT) 70 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && AS OFTEN HAPPENS IN NEW ENGLAND, SPRING-LIKE WEATHER CONTINUED WELL INTO JUNE. THE ACTIVE JET STREAM PATTERN THAT BROUGHT FREQUENT STORM SYSTEMS THROUGH THE REGION CONTINUED TO BRING RENEWED RAINFALL EVERY FEW DAYS. THE FREQUENT CLOUDS AND RAIN ALSO KEPT TEMPERATURES COOL. THINGS BEGAN TO TURN AROUND IN LATE JUNE AND EARLY JULY WHEN WARM AND HUMID AIR ARRIVED AND THE FREQUENT STORMINESS ENDED. PORTLAND SAW 10 STRAIGHT DAYS AT 80 DEGREES OR WARMER AT THE BEGINNING OF JULY. THE HOTTEST TEMPERATURE IN THIS STRETCH WAS 91 DEGREES ON JULY 6. A RAINY DAY ON JULY 11 BROUGHT A BREAK FROM THE HEAT AS THE TEMPERATURE DIDN`T GET OUT OF THE 60S. EVENTUALLY, THOUGH, THE HOT AND HUMID WEATHER DID RETURN. THE HOTTEST TEMPERATURE OF THIS WARM STRETCH WAS 94 DEGREES ON JULY 21. A COLD FRONT BROUGHT SOME RAIN AND COOLER TEMPERATURES FOR ABOUT A WEEK, BUT THE HEAT ARRIVED AGAIN WITH ANOTHER 90 DEGREE DAY ON JULY 31. THE THREE PERIODS OF WARM WEATHER ENDED UP COMBINING TO MAKE JULY 2019 THE WARMEST MONTH ON RECORD AT PORTLAND. ALTHOUGH WARM WEATHER CONTINUED INTO AUGUST, MOST OF THE AIR MASSES AFFECTING THE REGION CAME OUT OF CANADA WHICH BROUGHT LESS HUMIDITY. JUST AS WARM AND HUMID WEATHER WOULD ARRIVE ANOTHER COLD FRONT WOULD BRING A FEW SHOWERS AND A RETURN TO COOLER AND DRIER CONDITIONS. THE MOST SIGNIFICANT RAINFALL OF THE SUMMER CAME ON AUGUST 21 WHEN A STALLED FRONTAL BOUNDARY LED TO NEARLY 2 INCHES OF RAIN FALLING. AFTER ABOUT A WEEK OF COOL WEATHER, A WARM FRONT WITH TROPICAL MOISTURE FROM OFFSHORE TROPICAL STORM ERIN BROUGHT ANOTHER ROUND OF HEAVIER RAINFALL ON THE NIGHT OF AUGUST 28 INTO THE MORNING OF THE MORNING OF AUGUST 29. THE AVERAGE TEMPERATURE FOR THE SUMMER WAS 68.3 DEGREES WHICH WAS 1.4 DEGREES ABOVE NORMAL AND TIED FOR THE 9TH WARMEST SUMMER ON RECORD. THE WARMEST SUMMER WAS 68.9 DEGREES IN 2018 AND 2016. THE COOLEST WAS 63.7 DEGREES IN 1964. THE FOLLOWING TABLE LISTS THE WARMEST SUMMERS AT PORTLAND. WARMEST AVERAGE TEMPERATURE IN SUMMER (SINCE 1941)... RANK TEMP YEAR 1 68.9 2018 68.9 2016 3 68.7 2010 68.7 1988 5 68.6 1999 6 68.5 2012 68.5 1991 68.5 1973 9 68.3 2019 <=== 68.3 1994 A TOTAL OF 12.85 INCHES OF RAIN FELL WHICH WAS 2.31 INCHES ABOVE NORMAL AND THE WETTEST SUMMER SINCE 2014. THE MOST FREQUENT RAINFALL FELL IN JUNE, BUT THE HEAVIEST RAIN FELL IN AUGUST WITH AUGUST 21 RECORDING THE MOST AT 1.91 INCHES. THE WETTEST SUMMER WAS IN 2009 WHEN 22.31 INCHES OF RAIN FELL. THE DRIEST WAS IN 1999 WHEN ONLY 4.10 INCHES WAS RECORDED. THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN SUMMER 2019... DATE RECORD PREVIOUS JUN 3 3 - SMALLEST TEMPERATURE RANGE 4 IN 1990, 1944 JUL 20 71 - WARMEST LOW TEMPERATURE 70 IN 2013, 1991, 1949 JUL 21 76 - WARMEST LOW TEMPERATURE 72 IN 2011 JUL 21 85 - WARMEST AVERAGE TEMPERATURE 85 IN 2011, 1977 (TIED) AUG 17 6 - SMALLEST TEMPERATURE RANGE 7 IN 1965, 1951 AUG 21 1.91 - GREATEST PRECIPITATION 1.81 IN 1904 $$ KIMBLE