Climatological Report (Monthly)
Issued by NWS Caribou, ME
Issued by NWS Caribou, ME
038
CXUS51 KCAR 020756
CLMCAR
CLIMATE REPORT
NATIONAL WEATHER SERVICE CARIBOU ME
340 AM EDT THU OCT 02 2025
...................................
...THE CARIBOU ME CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 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 92 09/01/2010
LOW 23 09/29/1980
09/22/1950
HIGHEST 78 09/01 MM MM 86 09/18
09/02
09/18
LOWEST 31 09/21 MM MM 43 09/15
09/21
AVG. MAXIMUM 69.1 67.3 1.8 70.7
AVG. MINIMUM 44.3 45.9 -1.6 49.1
MEAN 56.7 56.6 0.1 59.9
DAYS MAX >= 90 0 0.1 -0.1 0
DAYS MAX <= 32 MM 0.0 MM 0
DAYS MIN <= 32 1 1.7 -0.7 0
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 8.81 1999
MINIMUM 0.86 1968
TOTALS 1.77 -1.67
DAILY AVG. 0.06 0.11 -0.05 0.03
DAYS >= .01 6 11.5 -5.5 5
DAYS >= .10 4 6.9 -2.9 3
DAYS >= .50 2 2.1 -0.1 1
DAYS >= 1.00 0 0.9 -0.9 0
GREATEST
24 HR. TOTAL 0.88 09/25 TO 09/26 0.59 09/26 TO 09/27
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 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 242 269 -27 175
SINCE 7/1 357 381 -24 MM
COOLING TOTAL 0 17 -17 32
SINCE 1/1 252 224 28 MM
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WIND (MPH)
AVERAGE WIND SPEED 4.9
HIGHEST WIND SPEED/DIRECTION 24/240 DATE 09/28
HIGHEST GUST SPEED/DIRECTION 36/240 DATE 09/28
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.31
NUMBER OF DAYS FAIR 18
NUMBER OF DAYS PC 7
NUMBER OF DAYS CLOUDY 5
AVERAGE RH (PERCENT) 72
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 0 MIXED PRECIP 0
HEAVY RAIN 2 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 18 FOG W/VIS <= 1/4 MILE 6
HAZE 1
- INDICATES NEGATIVE NUMBERS.
* INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
................................................................
...SEPTEMBER 2025 CLIMATE NARRATIVE FOR NORTHERN/EASTERN MAINE...
The September 2025 season wrapped up with above average temperatures
throughout northern and eastern Maine. Drought conditions also
continued, and expanded throughout the state, with significantly
below average precipitation deficits at all climate sites.
Temperatures were above normal at all sites, with average mean
temperatures generally 0.5-1 degrees Fahrenheit above normal.
Monthly maximum temperatures were significantly above normal by 2-3
degrees. Houlton was the warmest station, ranging 3.1 degrees above
normal. Millinocket was the next warmest, with max temperatures
being 2.7 degrees above normal. Lastly, Caribou and Bangor both tied
2.1 degrees above climate normals for their daytime highs.
Monthly minimum temperatures were generally 0.5-1.5 degrees below
climate normals. Caribou had the largest deviation, being around 1.5
degrees colder than climate normals. Houlton was next, around 1
degree cooler than normal. Millinocket and Bangor had minor
deviations, only about 0.3 degrees below average.
Precipitation totals are the main highlight of September, as the
drought that began in August worsened throughout the month. All
climate sites underwent continued precipitation deficits. Houlton
had the largest deficit, only receiving 1.67 inches of rain the
entire month, which is 1.73 inches below normal. This is the 13th
driest September for Houlton on record, since 1948. Caribou received
1.77 inches of precipitation, being 1.67 inches below normal for
precipitation normals, making it Caribous 11th driest September
since 1939. NWS Caribou observations reported 3.52 inches of
moisture evaporation throughout the month, further exacerbating the
precipitation deficit. Central Maine did receive some wetting rains
throughout the month, but none of said storms were drought busters.
Millinocket received 2.21 inches of rain, still resulting in a 1.4
inches deficit. Bangor received the most rain of all the sites, with
a sum of 3.06 inches falling throughout the month, resulting in only
a 0.70 inch deficit.
In terms of the drought, at the end of August, the North Woods
region was not under drought. Central and eastern Aroostook,
alongside northern Piscataquis, Somerset, and Penobscot, were
abnormally dry. Central Maine and Downeast were in moderate drought,
and coastal Downeast was in severe drought. By September 2nd, severe
drought expanded up into central Maine, and the interior Downeast.
By the end of September, abnormally dry conditions expanded into the
North Woods and remained in northern Piscataquis, Penobscot,
Somerset and eastern Aroostook. Moderate drought conditions were in
southern Aroostook, central Piscataquis and Penobscot. Severe
drought extended through central Maine in the Penobscot region,
interior Downeast, and Washington countys coastal area. Lastly,
Hancock countys coastline upgraded to extreme drought conditions by
the end of the month.. No significant severe weather events occurred
in September.
Looking ahead, the Climate Prediction Center (CPC) is anticipating
above average temperatures during October. There are no strong
signals for above or below average precipitation in Maine.
Typically, northern and eastern Maine experiences maximum
temperatures in the 50s, and overnight minimum temperatures in the
30s throughout October. Snowfall does typically begin in northern
and eastern Maine in October, with a climatological normal of
roughly 0.5-2 inches falling between Caribou and Bangor by the end
of the month.
$$
ASB