Thursday, October 07, 2021

September 2021 Climate Summary for Northern and Eastern Maine

...SEPTEMBER 2021 CLIMATE NARRATIVE FOR NORTHERN/EASTERN MAINE...

SEPTEMBER 2021 FOR NORTHERN AND EASTERN MAINE FINISHED WITH ABOVE
NORMAL TEMPERATURES AND MUCH ABOVE NORMAL RAINFALL.

AVERAGE TEMPERATURES FOR THE MONTH MOSTLY RANGED FROM 1.5 TO
2.5 DEGREES F ABOVE THE 1991-2020 MEANS. MOST SEPTEMBER MEAN
TEMPERATURES FOR OUR CLIMATE SITES ARE TIGHTLY CLUSTERED AROUND
THEIR AVERAGES OVER THE LENGTH OF RECORD FOR EACH SITE.
SUBSEQUENTLY, THESE RELATIVELY MODEST TEMPERATURE DEPARTURES
PLACED MOST OF OUR CLIMATE LOCATIONS WITHIN THE TOP 10 WARMEST
SEPTEMBERS. THE FOLLOWING ARE THE RANKINGS THIS MONTH FOR EACH
LOCATION: CARIBOU WITH 58.5 DEGREES...7TH WARMEST, BANGOR WITH
62.3 DEGREES...13TH WARMEST, HOULTON WITH 58.6 DEGREES...5TH
WARMEST, AND MILLINOCKET WITH 60.3 DEGREES...7TH WARMEST. THESE
COMPARE TO THE WARMEST SEPTEMBER AVERAGE TEMPERATURE YEARS AS
FOLLOWS: CARIBOU 61.7 IN 1999, BANGOR 65.6 IN 1934, HOULTON 62.4
IN 1999, AND MILLINOCKET 64.1 IN 2015.

THE MONTH BEGAN WITH THE FIRST FEW AND ENDED WITH THE LAST FEW
DAYS ON A COOL NOTE WITH MOST OF THE REST OF THE MONTH AT TO
ABOVE NORMAL. THE WARMEST DAILY DEPARTURES FROM NORMAL OF +10 TO
+15 DEGREES F OCCURRED BETWEEN THE 22ND AND 25TH. OTHERWISE, NO
VERY WARM DAILY HIGH TEMPERATURES WERE RECORDED THIS SEPTEMBER
WITH THE WARMEST HIGHS RECORDED ON THE 18TH AND 23RD WITH BANGOR
THE ONLY CLIMATE SITE ECLIPSING 80 DEGREES. INCREASED CLOUD COVER
AND RAINFALL RESULTED IN WARMER OVERNIGHT LOWS, WITH ONLY THE
MORNING OF 26TH FEATURING LOWS IN THE 30S ACROSS THE NORTH WITH
PATCHY TO AREAS OF FROST.

RAINFALL MOSTLY RANGED FROM 150 TO 250 PERCENT OF AVERAGE ACROSS
THE REGION. THE FOLLOWING ARE RANKINGS FOR OUR CLIMATE SITES FOR
THIS SEPTEMBER: CARIBOU WITH 6.13 INCHES...7TH WETTEST, BANGOR
WITH 9.42 INCHES...2ND WETTEST, HOULTON WITH 7.57 INCHES...4TH
WETTEST, AND MILLINOCKET WITH 7.28 INCHES...9TH WETTEST. THESE
COMPARE TO THE WETTEST SEPTEMBERS OF RECORD FOR EACH LOCATION AS
FOLLOWS: CARIBOU 8.81 INCHES IN 1999, BANGOR 9,88 INCHES IN 1999,
HOULTON 10.20 INCHES IN 2015, AND MILLINOCKET 10.69 INCHES IN
1932.

SOMEWHAT SIMILAR TO SEPTEMBER 1999 AND LAST SEPTEMBER, PRIOR
SUMMER DROUGHT LIKE CONDITIONS ACROSS THE REGION WERE GREATLY
LESSENED BY SEVERAL HEAVY RAINFALLS ASSOCIATED WITH FRONTAL
SYSTEMS WITH TROPICAL MOISTURE. HEAVY RAIN DAYS THAT AFFECTED ALL
OR PARTS OF THE REGION OCCURRED ON THE 2ND-3RD, 9TH-10TH, AND
24TH-26TH WITH MAXIMUM RAINFALLS IN EXCESS OF 4 INCHES AT MANY
LOCATIONS WITH THE 9TH-10TH AND 24-26TH EVENTS. WITH MUCH MORE IN
THE WAY OF BOTH CLOUD COVER AND RAINFALL IN ADDITION TO COOLER
TEMPERATURES AND SHORTER DAYS, TOTAL MONTHLY EVAPORATION AS
MEASURED AT CARIBOU WAS REDUCED TO 2.25 INCHES, WHICH IS ABOUT
HALF THE TOTAL EVAPORATION OBSERVED LAST MONTH.

THE CLIMATE PREDICTION CENTER`S PREDICTION FOR OCTOBER FOR OUR
REGION IS CALLING FOR INCREASED ODDS OF ABOVE NORMAL TEMPERATURES
OVER NEAR AND ESPECIALLY BELOW NORMAL TEMPERATURE CATEGORIES AND
SIGNIFICANTLY INCREASED ODDS OF BELOW NORMAL PRECIPITATION OVER
NEAR AND ESPECIALLY ABOVE AVERAGE PRECIPITATION CATEGORIES.
AVERAGE TEMPERATURES FOR THE 1991-2020 THIRTY YEAR PERIOD ACROSS
NORTHERN/EASTERN MAINE FOR OCTOBER RANGE FROM LOWS OF LOWER TO MID
30S (UPPER 30S TO AROUND 40) TO HIGHS OF LOWER 50S (UPPER 50S)
FOR NORTHERN (DOWNEAST AREAS). TOTAL AVERAGE PRECIPITATION FOR THE
MONTH GENERALLY RANGES FROM 4.00 TO 4.50 INCHES FOR THE SAME 30
YEAR PERIOD.

$$

VJN/CB

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