Climatological Report (Monthly)
Issued by NWS Portland, ME

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CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAY ME
1231 PM EDT WED OCT 4 2017

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

...THE CONCORD NH CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1868 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              98   09/02/1953
 LOW               20   09/30/1941
HIGHEST            91   09/24        88       3       94  09/09
LOWEST             35   09/02        32       3       32  09/26
AVG. MAXIMUM     77.2              72.6     4.6     78.0
AVG. MINIMUM     53.6              47.4     6.2     50.8
MEAN             65.4              60.0     5.4     64.4
DAYS MAX >= 90      4               0.6     3.4        1
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               1.5    -1.5        1
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        10.97   1888
 MINIMUM         0.21   1914
TOTALS           3.06              3.38   -0.32     2.94
DAILY AVG.       0.10              0.11   -0.01     0.10
DAYS >= .01         7               9.3    -2.3        9
DAYS >= .10         4               6.1    -2.1        4
DAYS >= .50         2               2.2    -0.2        1
DAYS >= 1.00        2               0.8     1.2        1
GREATEST
 24 HR. TOTAL    1.26   09/03

SNOWFALL (INCHES)
RECORDS
 TOTAL              T   1992
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      88               187     -99      102
 SINCE 7/1        141               235     -94      114
COOLING TOTAL     105                37      68       91
 SINCE 1/1        550               450     100      715
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              4.6
HIGHEST WIND SPEED/DIRECTION    24/320    DATE  09/28
HIGHEST GUST SPEED/DIRECTION    35/300    DATE  09/01

SKY COVER
AVERAGE SKY COVER           0.40

AVERAGE RH (PERCENT)     72

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     HEAVY RAIN                 4
RAIN                      4     LIGHT RAIN                 8
FREEZING RAIN             0     LT FREEZING RAIN           0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     FOG                       19
FOG W/VIS <= 1/4 MILE     6     HAZE                       1

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

&&

SEPTEMBER BEGAN THE SAME WAY AUGUST ENDED, WITH COOL, FALL-LIKE
WEATHER. THE TEMPERATURE FELL ALL THE WAY TO 35 DEGREES ON SEPTEMBER
2! THE NEXT FEW DAYS BROUGHT A FEW ROUNDS OF RAINFALL INCLUDING MORE
THAN AN INCH OF RAIN ON THE 3RD AND THE 6TH. BY THE MIDDLE OF THE
MONTH A WARM AND HUMID WEATHER PATTERN HAD BEGUN, WITH A RIDGE OF
HIGH PRESSURE OVER THE WESTERN ATLANTIC AND EAST COAST PUMPING WARM,
HUMID AIR INTO NEW ENGLAND. THE TEMPERATURE TOPPED 80 DEGREES FOR 7
CONSECUTIVE DAYS FROM THE 11TH THROUGH THE 17TH. ALTHOUGH OCCASIONAL
COLD FRONTS KNOCKED TEMPERATURES BACK A FEW DEGREES, THE WARMTH AND
HUMIDITY KEPT RETURNING. THE HOTTEST STRETCH WAS FROM THE 24TH
THROUGH THE 27TH WHEN THE TEMPERATURE HIT 90 DEGREES FOR 4
CONSECUTIVE DAYS. THIS WAS THE LONGEST STRETCH OF 90 DEGREE WEATHER
TO BE OBSERVED SO LATE IN THE SEASON AT CONCORD. A STRONG COLD FRONT
BROUGHT COOLER WEATHER FOR THE LAST TWO DAYS OF THE MONTH, MORE
TYPICAL OF WHAT WOULD BE EXPECTED IN FALL.

THE AVERAGE TEMPERATURE FOR THE MONTH WAS 65.4 DEGREES WHICH WAS 5.4
DEGREES ABOVE NORMAL AND THE 3RD WARMEST SEPTEMBER ON RECORD. THE
WARMEST SEPTEMBER WAS IN 1961 WHEN THE AVERAGE TEMPERATURE WAS 67.1
DEGREES. THE COOLEST WAS IN 1893 WHEN THE AVERAGE WAS ONLY 53.6
DEGREES. 4 OF THE LAST 7 SEPTEMBERS AT CONCORD HAVE FINISHED IN THE
TOP 10 WARMEST ON RECORD. THE FOLLOWING TABLE LISTS THE WARMEST
SEPTEMBERS ON RECORD.

WARMEST AVERAGE TEMPERATURE IN SEPTEMBER (SINCE 1868)...
RANK  TEMP  YEAR
1     67.1  1961
2     65.5  1881
3     65.4  2017 <===
4     65.2  2015
5     64.6  1877
6     64.4  2016
7     64.3  1872
8     63.9  2011
9     63.7  1880
10    63.6  1891

THE HEAT WAVE FROM SEPTEMBER 24 THROUGH 27 FEATURED 4 CONSECUTIVE
DAYS OF 90 DEGREE HEAT. THIS WAS THE LATEST IN THE SEASON THAT
CONCORD HAS EVER OBSERVED 3 OR MORE CONSECUTIVE DAYS OF 90 DEGREE
HEAT. IT ALSO TIES AS THE LONGEST CONSECUTIVE STRETCH OF 90 DEGREE
HEAT TO OCCUR IN SEPTEMBER. THE FOLLOWING TABLE LISTS THE ONLY TIMES
IN CONCORD`S HISTORY THAT 3 OR MORE CONSECUTIVE DAYS OF 90 DEGREE
HEAT HAVE BEEN OBSERVED IN SEPTEMBER.

MOST CONSECUTIVE DAYS OF 90 DEGREE HEAT (SINCE 1868)...
RANK  DAYS  DATES
1      4    SEP 24 THRU SEP 27, 2017 <===
2      4    AUG 31 THRU SEP 3, 1937
3      4    SEP 3 THRU 6, 1880
4      3    SEP 8 THRU 10, 2002
5      3    SEP 2 THRU 4, 1973
6      3    SEP 10 THRU 12, 1961
7      3    SEP 21 THRU 23, 1895

A TOTAL OF 3.06 INCHES OF RAIN FELL WHICH WAS 0.32 INCHES BELOW
NORMAL. NEARLY ALL OF THIS RAIN FELL IN THE FIRST WEEK OF THE MONTH,
WITH THE HEAVIEST FALLING ON THE 3RD WHEN 1.26 INCHES WAS RECORDED.
THE DRIEST SEPTEMBER WAS IN 1914 WHEN ONLY 0.21 INCHES FELL. THE
WETTEST WAS IN 1888 WHEN 10.97 INCHES WAS MEASURED.

THE FOLLOWING DAILY RECORDS WERE SET OR TIED IN SEPTEMBER 2017...
DATE  RECORD                                PREVIOUS
24    91 - WARMEST HIGH TEMPERATURE         90 IN 2010
25    90 - WARMEST HIGH TEMPERATURE         89 IN 1970
26    90 - WARMEST HIGH TEMPERATURE         90 IN 2007 /TIED/
27    90 - WARMEST HIGH TEMPERATURE         88 IN 1933

$$

KIMBLE



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