Sunday, September 28, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

SUNDAY SEPTEMBER 28, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0538E
SUNSET:  1730E

EARLY MORNING RAIN DRYING OUT TO ANOTHER MILD DAY….

During the early morning hours we had a brief period of rain
which totaled 0.05″. The rain made for a soggy ground with
overcast skies and thin fog throughout the area. By the mid
morning the skies cleared and we had mostly sunny skies and
another warm, summer-like afternoon.

As mentioned, temperatures have been on the above average side
once again, with us reaching 80F for a third day in a row. Dew
points have also remained in the 60’s which has really made it
feel like we are in the throws of summer. The slight breeze
from the southwest has only amplified the summer feel, bringing
in warm, moist air to the region.

The wind has been mostly out of the west-southwest throughout
the day, with an average of about 9 mph. The peak gust for the
day so far is around 20mph, which occurred just before noon.

Visibility has remained at around 40 miles throughout the day
today. Visibility was impacted by morning fog and then later
by rising dew points.

The maximum temperature so far today is 80F degrees, which is
12 degrees above the normal high of 68F. The minimum temperature
since midnight is 63F degrees, which is 12 degrees above the
normal low of 51F.

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Today’s Observations:

7 A.M.
Weather: Overcast altocumulus, few breaks in overcast all
quadrants, clearing line SSW-NNW
Temperature: 63F; Dew Point: 63F; Relative Humidity: 100%
Wind: SW @ 5 kts, wind light
Sea-level pressure: 1017.6 mb; 30.05 in. Hg: falling, then
rising
Visibility: 40 miles, thin fog all quadrants
6-hr Max temp: 63F
6-hr Min temp: 63F
24-hr Precip: 0.05 inches
BHO SA 1155 E120 OVC 40 176/63/63/2305/005/ FEW BINOVC ALQDS
CLRG LINE SSW-NNW THN F ALQDS WND LGT/ 8/07/ 53005 6005/
70005 10063 20063

10 A.M.
Weather: Thin scattered cirrus, few cumulus distant E-SSE
Temperature: 72F; Dew Point: 63F; Relative Humidity: 72%
Wind: WSW @ 8 kts
Sea-level pressure: 1018.1 mb; 30.06 in. Hg: rising steadily
Visibility: 40 miles
3-hr Precip: 0.00 inches
BHO SA 1455 250 -SCT 40 181/72/63/2408/006/ FEW CU DSNT E-SSE/
8/201 52005

1 P.M.
Weather: Thin scattered cirrus, few cumulus all quadrants
Temperature: 80F Dew Point: 64F; Relative Humidity: 57%
Wind: S @ 8G15 kts
Sea-level pressure: 1017.3 mb; 30.04 in. Hg: falling, then
more rapidly
Visibility: 40 miles
6-hr Max temp: 80F
6-hr Min temp: 63F
6-hr Precip: 0.00 inches
BHO SA 1755 250 -SCT 40 173/80/64/08G15/004/ FEW CU ALQDS/
8/201 58008 10080 20063

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SUMMARY FOR SATURDAY, SEPTEMBER 27, 2025

TEMPERATURE (DEGREES F)
MAX…….80   NORMAL…..68
MIN…….59   NORMAL…..51
MEAN……70   NORMAL…..60

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………+10
TOTAL DEPARTURE FOR THE MONTH………………………+19 [+0.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-6
TOTAL HEATING UNITS FOR THE MONTH…………….41  DEPARTURE…….-38
TOTAL HEATING UNITS FOR THE SEASON……………61  DEPARTURE…….-36
TOTAL HEATING UNITS LAST SEASON TO DATE……….63  DEPARTURE……..-2

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..5  DEPARTURE……..+4
TOTAL COOLING UNITS FOR THE MONTH…………….54  DEPARTURE…….-18
TOTAL COOLING UNITS FOR THE SEASON…………..726  DEPARTURE…….+58
TOTAL COOLING UNITS LAST SEASON TO DATE………757  DEPARTURE…….-31

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated

F420C (Official)………..20 S    @   07:29 P.M.
VECTOR #1 (1-Sec)……….20 S    @   07:29 P.M.
VECTOR #2 (1-Sec)……….19 S    @   07:29 P.M.
DAVIS #1……………….21 S    @   07:23 P.M.
DAVIS #2 ………………24 S    @   07:29 P.M.
RMY #1 (Instantaneous)…..18 S    @   07:29 P.M.
RMY #2 (Instantaneous)…..20 S    @   07:29 P.M.
MERLIN…………………17 S
RICHARDS (C5C) (Inst)……18 S    @   07:29 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 S    @   07:34 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14 S    @   07:34 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 S    @   07:34 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 S    @   07:44 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 S    @   07:34 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 S    @   07:34 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 S    @   07:34 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14 S    @   07:34 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.6 S [182 total miles] VECTOR #1……………….8.1
VECTOR #2……………….8.6
DAVIS #1………………..7.9 SW
DAVIS #2………………..7.9 SW
RMY #1………………….7.9 SW
RMY #2………………….8.5 SW
RICHARDS (C5C)…………..8.4

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.05 DEPARTURE…..-0.10
TOTAL PRECIPITATION FOR THE MONTH…………..4.49 DEPARTURE…..+0.89
TOTAL PRECIPITATION FOR THE YEAR (2025)…….35.82 DEPARTURE…..-2.39

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PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY:  R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

9/1   73/55/64/-5/0.00/221/28            23 NE  VEC1 23 ENE RMY 23
9/2   77/58/68/-1/0.00/714/91            18 ESE VEC1 19 ESE RMY 18
9/3   78/57/68/0/0.00/719/92             21 SSW VEC1 21 SSW RMY 21
9/4   81/56/69/+1/0.00/694/89            26 SSW VEC1 27 SSW RMY 28
9/5   82/63/73/+5/0.12/404/52            30 SSW VEC1 31 SSW RMY 33
9/6   84/64/74/+6/1.05/457/59            55 W   VEC1 55 W   RMY 57 TSTM
9/7   64/56/60/-7/0.97/000/00            16 WNW VEC1 16 NNE RMY 15
9/8   68/49/59/-8/0.00/508/66            21 NW  VEC1 21 NW  RMY 24
9/9   70/53/62/-5/0.00/697/91            22 ENE VEC1 23 E   RMY 23
9/10  65/54/60/-6/0.00/183/24            24 NE  VEC1 25 NE  RMY 25
9/11  77/51/64/-2/0.00/714/94            21 N   VEC1 17 N   RMY 18
9/12  71/56/64/-2/0.00/735/97            24 ENE VEC1 24 NNE RMY 23
9/13  76/55/66/+1/T/634/84               26 S   VEC1 26 S   RMY 25
9/14  79/57/68/+3/0.00/572/76            15 NE  VEC1 15 SW  RMY 15
9/15  72/57/65/0/0.00/689/92             20 N   VEC1 19 N   RMY 18
9/16  71/55/63/-1/0.00/403/54            20 E   VEC1 19 ESE RMY 19
9/17  71/55/63/-1/T/424/57               22 E   VEC1 22 E   RMY 21
9/18  75/61/68/+5/0.44/252/34            20 S   VEC1 20 S   RMY 20 TSTM
9/19  80/57/69/+6/0.00/715/97            24 N   VEC1 24 N   RMY 23
9/20  67/51/59/-4/0.00/705/96            20 SE  VEC1 19 SE  RMY 18
9/21  68/52/60/-2/0.00/593/81            18 ESE VEC1 19 SE  RMY 19
9/22  73/53/63/+1/0.00/620/85            20 SSW VEC1 20 SW  RMY 21
9/23  78/57/68/+6/0.00/305/42            25 SW  VEC1 25 SW  RMY 26
9/24  64/61/63/+2/0.19/000/00            21 E   VEC1 21 E   RMY 22
9/25  70/62/66/+5/1.67/000/00            35 SSW VEC1 35 SSW RMY 35 TSTM
9/26  80/63/72/+12/0.00/…/..           24 NW  VEC1 23 WNW RMY 27
9/27  80/59/70/+10/0.00/…/..           20 S   VEC1 20 S   RMY 18

9/28 The low since midnight is 63F, the daily normal low is 51F.

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SEPTEMBER DAILY RECORDS TO DATE

NONE.

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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR SEPTEMBER 28
HIGH 86F IN 2014
LOW 33F IN 1897,1947
PRECIP 2.46 INCHES IN 2004
PEAK GUST 69 MPH NE IN 1962

RECORDS FOR SEPTEMBER 29
HIGH 85F IN 1952
LOW 28F IN 1914 (SEPTEMBER MINIMUM RECORD)
PRECIP 2.61 INCHES IN 1907
PEAK GUST 62 MPH S IN 2005

TODAY’S REPORT PREPARED BY: Amanda Joly