Climatological Report (Monthly)
Issued by NWS Portland, ME

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000 CXUS51 KGYX 021725 CCA CLMPWM PWMCLMPWM 000 TTAA00 KGYX 020001 CLIMATE REPORT NATIONAL WEATHER SERVICE GRAY ME 912 PM EDT TUE AUG 1 2017 ................................... ...THE PORTLAND ME CLIMATE SUMMARY FOR THE MONTH OF JULY 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 100 07/22/2011 LOW 40 07/07/1965 07/03/1962 HIGHEST 88 07/20 91 -3 95 07/22 LOWEST 50 07/30 50 0 54 07/03 AVG. MAXIMUM 78.5 78.8 -0.3 81.3 AVG. MINIMUM 59.5 59.4 0.1 61.2 MEAN 69.0 69.1 -0.1 71.2 DAYS MAX >= 90 0 1.5 -1.5 3 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 10.84 1915 MINIMUM 0.61 1965 TOTALS 1.05 3.61 -2.56 1.70 DAILY AVG. 0.03 0.12 -0.09 0.05 DAYS >= .01 6 11.0 -5.0 9 DAYS >= .10 3 6.8 -3.8 5 DAYS >= .50 1 2.6 -1.6 0 DAYS >= 1.00 0 0.8 -0.8 0 GREATEST 24 HR. TOTAL 0.57 07/18 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 DAYS >= 1.0 0 0.0 0.0 GREATEST SNOW DEPTH 0 24 HR TOTAL 0.0 DEGREE_DAYS HEATING TOTAL 13 17 -4 13 SINCE 7/1 13 17 -4 13 COOLING TOTAL 144 144 0 216 SINCE 1/1 253 208 45 264 ................................................................. WIND (MPH) AVERAGE WIND SPEED 6.4 HIGHEST WIND SPEED/DIRECTION 23/180 DATE 07/01 HIGHEST GUST SPEED/DIRECTION 33/180 DATE 07/01 SKY COVER AVERAGE SKY COVER 0.50 AVERAGE RH (PERCENT) 70 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 2 HEAVY RAIN 2 RAIN 0 LIGHT RAIN 10 FREEZING RAIN 0 LT FREEZING RAIN 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 FOG 12 FOG W/VIS <= 1/4 MILE 3 HAZE 3 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && PORTLAND STARTED THE MONTH OF JULY OFF WITH SUMMER-LIKE TEMPERATURES AND 4 STRAIGHT DAYS WITH HIGHS IN THE 80S, INCLUDING INDEPENDENCE DAY. SOME COOLER AIR ARRIVED FOR THE 6TH THRU 8TH, ALONG WITH LOWER HUMIDITY. THE WARMTH AND HUMIDITY BRIEFLY RETURNED, BEFORE COOLER AIR ARRIVED AGAIN. THERE WERE TWO STRAIGHT DAYS THAT THE TEMPERATURE DID NOT RISE OUT OF THE 60S IN MID JULY, BUT THE WARMTH AND HUMIDITY GRADUALLY RETURNED BRINGING ABOUT A WEEK OF SUSTAINED WARMTH. A COLD FRONT BROUGHT A MUCH COOLER AIR MASS INTO THE AREA ON JULY 23, WITH THE COOL, DRY CONDITIONS LASTING THROUGH THE REST OF THE MONTH. OVERALL THE MONTH OF JULY WAS NOTABLY DRY, WITH SLIGHTLY MORE THAN 1 INCH OF RAIN FALLING DURING THE MONTH. ALTHOUGH THERE WERE PERIODS OF WARMTH, THERE WERE NO PERIODS OF TRULY HOT WEATHER, WITH NO DAYS REACHING 90 DEGREES. THE AVERAGE TEMPERATURE FOR THE MONTH WAS 69.0 DEGREES WHICH WAS 0.1 DEGREES BELOW NORMAL AND THE COOLEST JULY SINCE 2009. IN FACT, THERE WERE 17 DAYS THAT THE TEMPERATURE DROPPED INTO THE 50S, THE MOST SUCH DAYS SINCE 2001. THE COOLEST JULY ON RECORD WAS IN 1962 WHEN THE AVERAGE TEMPERATURE WAS 64.0 DEGREES. THE WARMEST WAS IN 2011 WHEN THE AVERAGE TEMPERATURE WAS 72.7 DEGREES. A TOTAL OF 1.05 INCHES OF RAIN FELL, WHICH WAS 2.56 INCHES BELOW NORMAL AND THE 10TH DRIEST ON RECORD. THE HEAVIEST RAIN WAS ON JULY 18 WHEN 0.57 INCHES FELL. THE DRIEST JULY ON RECORD WAS IN 1965 WHEN ONLY 0.61 INCHES WAS MEASURED FOR THE MONTH. THE WETTEST WAS IN 1915 WHEN 10.84 INCHES FELL. THE FOLLOWING TABLE LISTS THE DRIEST JULYS ON RECORD AT PORTLAND. LEAST PRECIPITATION IN JULY (SINCE 1871)... RANK PRECIP YEAR 1 0.61 1965 2 0.65 1968 3 0.75 1972 4 0.76 1936 5 0.80 1950 6 0.95 1970 0.95 1937 8 0.96 1966 0.96 1893 10 1.05 2017 <=== THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN JULY 2017... DATE RECORD PREVIOUS 24 63 - COOLEST HIGH TEMPERATURE 65 IN 2009 24 59 - COOLEST AVERAGE TEMPERATURE 59 IN 1957 /TIED/ $$ KIMBLE

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