Climatological Report (Monthly)
Issued by NWS Caribou, ME
Issued by NWS Caribou, ME
097
CXUS51 KCAR 020347
CLMCAR
CLIMATE REPORT
NATIONAL WEATHER SERVICE CARIBOU ME
1147 PM EDT MON SEP 01 2025
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...THE CARIBOU ME CLIMATE SUMMARY FOR THE MONTH OF AUGUST 2025...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1939 TO 2025
WEATHER OBSERVED NORMAL DEPART LAST YEAR`S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
................................................................
TEMPERATURE (F)
RECORD
HIGH 95 08/02/1975
08/16/1944
08/14/1944
LOW 34 08/25/2003
08/31/2002
08/30/1982
HIGHEST 94 08/11 MM MM 90 08/02
08/12
08/13
LOWEST 38 08/19 MM MM 42 08/30
AVG. MAXIMUM 76.6 75.7 0.9 76.6
AVG. MINIMUM 51.8 54.1 -2.3 56.3
MEAN 64.2 64.9 -0.7 66.5
DAYS MAX >= 90 4 0.5 3.5 1
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 12.09 1981
MINIMUM 0.93 1957
TOTALS 3.25 -0.36
DAILY AVG. 0.10 0.12 -0.02 0.12
DAYS >= .01 6 13.0 -7.0 16
DAYS >= .10 3 7.5 -4.5 10
DAYS >= .50 3 2.5 0.5 2
DAYS >= 1.00 2 0.6 1.4 0
GREATEST
24 HR. TOTAL 1.29 08/30 TO 08/30 0.84 08/09 TO 08/10
SNOWFALL (INCHES)
RECORDS
TOTAL 0.0 MM
TOTALS 0.0 0.0 0.0 0.0
SINCE 7/1 0.0 0.0 0.0 MM
SNOWDEPTH AVG. 0 0
DAYS >= 1.0 0 0.0 0.0 0
GREATEST
SNOW DEPTH 0 0 MM
24 HR TOTAL MM MM
DEGREE DAYS
HEATING TOTAL 94 71 23 45
SINCE 7/1 115 113 2 MM
COOLING TOTAL 77 68 9 98
SINCE 1/1 252 207 45 MM
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WIND (MPH)
AVERAGE WIND SPEED 4.8
HIGHEST WIND SPEED/DIRECTION 21/140 DATE 08/29
HIGHEST GUST SPEED/DIRECTION 32/250 DATE 08/13
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.29
NUMBER OF DAYS FAIR 21
NUMBER OF DAYS PC 7
NUMBER OF DAYS CLOUDY 3
AVERAGE RH (PERCENT) 70
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 1 MIXED PRECIP 0
HEAVY RAIN 3 RAIN 4
LIGHT RAIN 12 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 15 FOG W/VIS <= 1/4 MILE 2
HAZE 4
- INDICATES NEGATIVE NUMBERS.
* INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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...AUGUST 2025 CLIMATE NARRATIVE FOR NORTHERN/EASTERN MAINE...
AUGUST 2025 FEATURED NORMAL TO SLIGHTLY BELOW AVERAGE TEMPERATURES
AND BELOW NORMAL PRECIPITATION FOR NORTHERN AND EASTERN MAINE.
TEMPERATURES ACROSS THE REGION RANGED FROM NORMAL TO 1.0 DEGREES (F)
BELOW THE 1991-2020 AVERAGES. IN CARIBOU, THE AVERAGE TEMPERATURE OF
64.2 DEGREES WAS 0.7 DEGREES BELOW THE 1991-2020 AVERAGE FOR AUGUST.
NO MAJOR CLIMATE SITE FINISHED IN THE TOP 10 COOLEST FOR THE MONTH
OF AUGUST.
DESPITE THE NEGATIVE AVERAGE TEMPERATURE DEPARTURES, ALL FOUR MAJOR
CLIMATE SITES HAD MAXIMUM TEMPERATURES AVERAGE OUT ABOVE NORMAL FOR
AUGUST. MAXIMUM TEMPERATURES AVERAGED 1.0 TO 3.0 DEGREES ABOVE
THE 1991-2020 NORMALS ACROSS THE AREA. THIS WAS MOSTLY DRIVEN BY
A HEATWAVE THAT OCCURRED BETWEEN THE 10TH AND 13TH. IN CARIBOU,
THERE WERE FOUR CONSECUTIVE DAYS WITH A HIGH TEMPERATURE OF 90
DEGREES OR HIGHER. THIS TIED FOR THE LONGEST SUCH STRETCH ON RECORD.
THE OTHER STRETCHES WERE AUGUST 28TH-SEPTEMBER 1ST, 2010, JULY 25TH-
JULY 28TH 1969, AND JUNE 15TH-JUNE 18TH, 1949. IN ADDITION, THE 10TH
THROUGH THE 13TH WAS THE WARMEST FOUR-DAY STRETCH ON RECORD FOR
CARIBOU WHEN AVERAGING BOTH HIGH AND LOW TEMPERATURES (79.0
DEGREES). THE PREVIOUS RECORD STRETCH WAS JULY 26TH-JULY 29TH, 1963
(78.9 DEGREES). RECORDS IN CARIBOU DATE BACK TO 1939. MULTIPLE DAILY
RECORD HIGH TEMPERATURES WERE SET AT CARIBOU, MILLINOCKET, AND
HOULTON DURING THE HEATWAVE. NO DAILY RECORDS WERE SET IN BANGOR DUE
TO RECORD HIGHS BEING HIGHER THERE FOR THE RESPECTIVE DAYS.
OUTSIDE OF THE AFOREMENTIONED HEAT WAVE, AUGUST 2025 FEATURED
NUMEROUS UNSEASONABLY COOL NIGHTS ACROSS THE REGION. MINIMUM
TEMPERATURES AVERAGED 2.0 TO 3.5 DEGREES BELOW THE 1991-2020 NORMALS
ACROSS NORTHERN AND EASTERN MAINE. IN HOULTON, THE AVERAGE
MINIMUM TEMPERATURE FOR THE MONTH WAS 49.0 DEGREES, 3.1 DEGREES
BELOW NORMAL. THIS WAS THE 9TH COOLEST AVERAGE LOW TEMPERATURE FOR
THE MONTH OF AUGUST ON RECORD IN HOULTON. RECORDS IN HOULTON
DATE BACK TO 1948. IN BANGOR, THE AVERAGE LOW TEMPERATURE FOR AUGUST
WAS 53.5 DEGREES, WHICH WAS 3.5 DEGREES BELOW THE 1991-2020 NORMAL.
THIS WAS THE 14TH COOLEST AVERAGE MINIMUM TEMPERATURE FOR AUGUST ON
RECORD IN BANGOR, AND THE COOLEST SINCE 2006 (53.2 DEGREES). RECORDS
IN BANGOR DATE BACK TO 1925. NEITHER CARIBOU NOR MILLINOCKET
FINISHED IN THE TOP 20 FOR COOLEST AVERAGE LOW TEMPERATURE FOR
AUGUST.
THERE WERE 20 DAYS WITH A LOW TEMPERATURE BELOW 50 DEGREES IN
HOULTON DURING THE MONTH. THIS WAS ONE DAY SHY OF THE RECORD OF 21,
SET IN 1968. IN MILLINOCKET, THERE WERE 14 DAYS WHERE THE LOW
TEMPERATURE DROPPED BELOW 50 DEGREES. THIS WAS THE 6TH MOST ON
RECORD, AND THE LARGEST NUMBER SINCE 1964 (17 DAYS). THE LARGEST
NUMBER OF DAYS WITH LOWS BELOW 50 DEGREES IN MILLINOCKET IN AUGUST
OCCURRED IN 1903 (20 DAYS). RECORDS IN MILLINOCKET DATE BACK TO
1903.
THE COOLEST MORNING OF THE MONTH OCCURRED ON THE 19TH. CARIBOU AND
HOULTON SAW LOW TEMPERATURES OF 38 AND 35 DEGREES, RESPECTIVELY.
THIS TIED WITH 2005 AS THE SECOND EARLIEST LOW TEMPERATURE (AFTER
AUGUST 1ST) OF 38 DEGREES OR LOWER ON RECORD. THE EARLIEST SUCH LOW
TEMPERATURE OCCURRED ON AUGUST 13TH, 1941 (36 DEGREES). IT WAS ALSO
THE SECOND EARLIEST (TIED WITH 2005) LOW OF 35 DEGREES OR LOWER IN
HOULTON ON RECORD. IT WAS JUST TWO DAYS LATER THAN THE RECORD FROM
AUGUST 17TH, 1979 (35 DEGREES). NUMEROUS LOCATIONS IN NORTHERN MAINE
SAW EARLY SEASON FROST ON THE 19TH. A WEATHER STATION IN ESTCOURT
STATION RECORDED A LOW OF 31 DEGREES THAT MORNING.
RAINFALL WAS GENERALLY 40 TO 60 PERCENT OF NORMAL FROM SOUTHEASTERN
AROOSTOOK COUNTY SOUTHWARD TO DOWNEAST MAINE AND NEAR BANGOR. THIS
LED TO THE DEVELOPMENT OF SEVERE DROUGHT (D2) CONDITIONS FOR COASTAL
DOWNEAST DURING AUGUST. MODERATE (D1) DROUGHT CONDITIONS DEVELOPED
IN THE PISCATAQUIS AND PENOBSCOT VALLEYS EASTWARD INTO INTERIOR
DOWNEAST AND FAR SOUTHEASTERN AROOSTOOK COUNTY. MOST PLACES SAW
LITTLE OR NO RAIN DURING THE FIRST HALF OF AUGUST. MODEST RAINFALL
LATER IN THE MONTH WAS NOT ENOUGH TO MAKE UP FOR THE EARLIER DRY
SPELL. AREAS FROM THE KATAHDIN REGION NORTHWARD SAW MORE RAINFALL
DURING AUGUST, GENERALLY 80 TO 90 PERCENT OF NORMAL. RAINFALL
EVENTS ON THE 23RD-25TH AND 29TH-30TH DROPPED OVER 1.00 INCH OF
RAINFALL IN PARTS OF THESE AREAS. HOWEVER, ABNORMALLY DRY
(D0) CONDITIONS STILL DEVELOPED FOR MOST PLACES FROM KATAHDIN
NORTHWARD. THE EXCEPTIONS WERE THE SAINT JOHN VALLEY AND THE NORTH
WOODS TOWARD THE QUEBEC BORDER. EVAPORATION IN CARIBOU Totaled 5.08
INCHES FOR THE MONTH. BY THE END OF THE MONTH, SOIL MOISTURE
Anomalies WERE BELOW THE 10TH PERCENTILE IN THE BANGOR REGION AND
DOWNEAST. NORTHERN MAINE HAD SOIL MOISTURE BETWEEN THE 10TH AND 30TH
PERCENTILE AT THE END OF AUGUST.
FOUR SEVERE THUNDERSTORM WARNINGS WERE ISSUED IN THE MONTH OF
AUGUST. THREE OF THOSE WERE ISSUED ON THE 14TH IN DOWNEAST MAINE.
TREE DAMAGE WAS REPORTED ALONG THE ROUTE 1 CORRIDOR NEAR PRINCETON
AND CALAIS. THE OTHER WARNING WAS ISSUED ON THE 13TH IN THE SAINT
JOHN VALLEY, WHERE TREE DAMAGE WAS REPORTED.
THE CLIMATE PREDICTION CENTER (CPC) OUTLOOK FOR SEPTEMBER 2025
INDICATES THAT THERE ARE NO STRONG CLIMATE SIGNALS FAVORING ABOVE
OR BELOW NORMAL TEMPERATURES IN NORTHERN AND EASTERN MAINE. THE
CPC OUTLOOK ALSO DOES NOT SHOW ANY STRONG CLIMATE SIGNALS FAVORING
ABOVE OR BELOW NORMAL PRECIPITATION. AVERAGE HIGH TEMPERATURES ARE
IN THE LOW TO MID 70S AT THE START OF THE MONTH, DROPPING TO THE
LOWER TO MID 60S BY THE END OF THE MONTH. AVERAGE LOWS DROP FROM THE
LOWER 50S EARLY IN THE MONTH TO THE LOWER 40S BY THE END OF THE
MONTH. FROST INCREASINGLY BECOMES A THREAT IN SEPTEMBER, ESPECIALLY
IN NORTHERN VALLEYS DURING THE SECOND HALF OF THE MONTH. ALTHOUGH
VERY RARE, SNOW HAS BEEN OBSERVED ACROSS FAR NORTHERN PORTIONS OF
THE REGION LATE IN THE MONTH. ON SEPTEMBER 29TH, 1991, CARIBOU
RECORDED 2.9 INCHES OF SNOW, WHICH IS THE EARLIEST MEASURABLE
SNOWFALL ON RECORD THERE. SEPTEMBER IS THE MONTH WHERE A TROPICAL
SYSTEM OR THE REMNANTS OF A TROPICAL SYSTEM IS MOST LIKELY TO AFFECT
THE AREA.
$$