Climatological Report (Monthly)
Issued by NWS Caribou, ME

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CXUS51 KCAR 021924 CCA
CLMCAR

CLIMATE REPORT
NATIONAL WEATHER SERVICE CARIBOU, ME
214 AM EDT MON OCT 2 2017

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

...THE CARIBOU ME CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1939 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              92   09/01/2010
 LOW               23   09/29/1980
                        09/22/1950
HIGHEST            88   09/26        MM      MM       82  09/07
                        09/25
LOWEST             31   09/30        MM      MM       31  09/30
AVG. MAXIMUM     72.3              65.4     6.9     68.9
AVG. MINIMUM     49.8              44.5     5.3     48.3
MEAN             61.0              55.0     6.0     58.6
DAYS MAX >= 90      0               0.1    -0.1        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      1               1.6    -0.6        1
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         8.81   1999
 MINIMUM         0.86   1968
TOTALS           3.13                     -0.19
DAILY AVG.       0.10              0.11   -0.01     0.08
DAYS >= .01         9              11.8    -2.8       13
DAYS >= .10         6               6.9    -0.9        8
DAYS >= .50         2               2.1    -0.1        0
DAYS >= 1.00        0               0.7    -0.7        0
GREATEST
 24 HR. TOTAL    0.96   09/07 TO 09/07           09/19 TO 09/20
                                                          09/30 TO 09/30
                                                          09/30 TO 09/30

SNOWFALL (INCHES)
RECORDS
 TOTAL            2.5   1991
TOTALS            0.0               0.1    -0.1      0.0
SINCE 7/1         0.0               0.1    -0.1      0.0
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0               0.0     0.0        0
GREATEST
 SNOW DEPTH         0   MM                             0  MM
 24 HR TOTAL      0.0   09/30 TO 09/30           09/30 TO 09/30
                                                          09/30 TO 09/30
                                                          09/30 TO 09/30

DEGREE_DAYS
HEATING TOTAL     146               313    -167      205
 SINCE 7/1        270               467    -197      285
COOLING TOTAL      34                11      23       22
 SINCE 1/1        221               180      41      275
.................................................

WIND (MPH)
AVERAGE WIND SPEED              5.8
HIGHEST WIND SPEED/DIRECTION    22/310    DATE  09/28
HIGHEST GUST SPEED/DIRECTION    39/300    DATE  09/27

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.40
NUMBER OF DAYS FAIR           13
NUMBER OF DAYS PC             12
NUMBER OF DAYS CLOUDY          5

AVERAGE RH (PERCENT)     72

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                6     RAIN                       6
LIGHT RAIN               11     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      13     FOG W/VIS <= 1/4 MILE      5
HAZE                      0

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

&&

...NORTHERN AND EASTERN MAINE SEPTEMBER 2017 MONTHLY NARRATIVE...

SEPTEMBER 2017 FINISHED WELL ABOVE AVERAGE IN TEMPERATURE AND MOSTLY
DRIER THAN NORMAL FOR RAINFALL.

AT MOST OF THE CLIMATE SITES ACROSS THE REGION, SEPTEMBER AVERAGED
BETWEEN 5 AND 6 DEGREES F ABOVE AVERAGE. INTERESTINGLY, THE RANKING
AT ALL OF OUR CLIMATE SITES WHICH INCLUDE CARIBOU...HOULTON...
MILLINOCKET AND BANGOR, WAS 3RD WARMEST, WITH SEPTEMBER 1999, 2015,
1961, AND 1934 COMPETITIVE OR A LITTLE WARMER DEPENDING ON WHAT
STATION THE COMPARISON IS MADE.

THE MONTH BEGAN ON A VERY COOL START, THEN TURNED PROGRESSIVELY MORE
ABOVE AVERAGE FURTHER INTO THE MONTH, THEN FINALLY ENDED ON A COOL
MORE FALL LIKE NOTE. WARM SPELLS INCLUDED THE 11TH THROUGH 17TH AND
THE 19TH THROUGH 27TH. THE 23RD THROUGH 26TH IN PARTICULAR DEFIED
NORMAL CLIMATOLOGY OF SHARPLY DECLINING AVERAGE TEMPERATURES WITH 4
STRAIGHT DAYS OF HIGH TEMPS WELL INTO THE 80S AND EVEN LOW 90S ON
THE 26TH AT SOME SITES INCLUDING MILLINOCKET AND AS FAR NORTH AS
HOULTON. MANY LOCATIONS EXPERIENCED THEIR WARMEST HIGH TEMPERATURES
SO LATE IN THE SEASON ON THE 25TH AND 26TH. INDEED, MONTHLY MAXIMUM
TEMPERATURES THIS MONTH WERE WARMER THAN LAST MONTHS MAXIMUM
TEMPERATURES WITH A GREATER NUMBER OF 80+ DEGREE HIGH TEMPS, BOTH
UNUSUAL FOR SEPTEMBER. A FEW LOCATIONS, SUCH AS CARIBOU, ALSO TIED
THE RECORD FOR THE GREATEST NUMBER OF 80+ DEGREE HIGH TEMPERATURE
DAYS FOR THE MONTH OF SEPTEMBER.

RAINFALL ACROSS THE REGION RANGED FROM 65 TO 100 PERCENT OF NORMAL,
WITH NORTHERN LOCATIONS GENERALLY RECEIVING MORE THAN DOWNEAST
AREAS. RAINFALL, HOWEVER, WAS VERY UNEVENLY DISTRIBUTED THROUGH THE
MONTH, WITH MOST RAIN FALLING BETWEEN THE 3RD AND 6TH WITH VERY
SCANTY AMOUNTS AFTERWARDS UNTIL THE 27TH ACROSS THE NORTH AND
THROUGH THE VERY END OF THE MONTH ELSEWHERE. CARIBOU WENT 17
STRAIGHT DAYS WITHOUT MEASURABLE RAINFALL BETWEEN THE 10TH AND
26TH, ENDING ON THE 27TH WHEN A LINE OF STRONG EVENING THUNDERSTORMS
ENDED THE RECORD SHATTERING LATE SEASON HEAT WAVE.

THE OFFICIAL OUTLOOK FOR THE MONTH OF OCTOBER FROM THE CLIMATE
PREDICTION CENTER FOR THE REGION IS TILTED TOWARD AN INCREASE
LIKELIHOOD OF ABOVE AVERAGE TEMPERATURES.  THERE ARE NO STRONG
CLIMATE SIGNALS THAT WOULD POINT TOWARD AN UNUSUALLY WET OR DRY
OCTOBER.

AVERAGE HIGHS AT CARIBOU DROP FROM 59 DEGREES ON THE 1ST TO 46F BY
THE END OF THE MONTH.  AVERAGE LOWS DROP FROM 40F ON THE 1ST TO 30
BY THE END OF THE MONTH.  AT BANGOR, AVERAGE HIGHS FALL FROM 64F TO
52F, WHILE THE AVERAGE LOWS DROP FROM 42F TO 33F.

TROPICAL OR EX-TROPICAL SYSTEMS CAN OCCASIONALLY AFFECT THE REGION
WITH HEAVY RAINFALL DURING THE MONTH OF OCTOBER.  THUNDERSTORMS ARE
NOT UNHEARD OF IN OCTOBER, BUT ARE NOT A FREQUENT OCCURRENCE.  SNOW
IS POSSIBLE DURING THE MONTH, BUT IS VERY RARE THE FIRST HALF OF THE
MONTH. SNOW BECOMES MUCH MORE LIKELY LATE IN THE MONTH, ESPECIALLY
SO ACROSS FAR NORTHERN AREAS.  OVER 1 1/2 HOURS OF AVAILABLE
DAYLIGHT IS LOST DURING THE MONTH OF OCTOBER.

$$

VJN/CB



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