Sunday, September 14, 2025
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, SEPTEMBER 14, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0523E
SUNSET: 1755E
A MIX OF SUN AND CLOUDS WITH SLIGHTLY MORE HUMID AIR….
Today has featured a mix of sun and clouds. The clouds most of this
morning were at the mid level consisting of altocumulus. However,
but late morning and into early this afternoon, cumulus developed
thanks to the surface heating of the day, and even a few rain
showers can be seen off to the west-southwest.
Temperatures are slightly above normal for this time of year,
reaching the upper 70s early this afternoon. Humidity levels are
a bit higher today as we are ahead of a weak shortwave/cold front.
Dew point values have risen from the upper 50s into the low 60s
today.
Winds are on the light side once again, with an average speed of
only around 7mph. The direction has been rather variable so far.
The peak gust occurred just after 12:30am this morning, with a
speed of 15mph.
Visibility has held steady at 40 miles all day, likely limited by
the moisture in the air.
The maximum temperature so far today is 79F degrees, which is 5
degrees above the normal high of 74F. The minimum temperature
since midnight is 57F degrees, which is 1 degree above the normal
low of 56F.
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Today’s Observations:
7 A.M.
Weather: Scattered altocumulus
Temperature: 61F; Dew Point: 59F; Relative Humidity: 93%
Wind: W @ 7 kts
Sea-level pressure: 1017.5 mb; 30.05 in. Hg: rising unsteadily
Visibility: 40 miles, thin fog
6-hr Max temp: 61F
6-hr Min temp: 57F
24-hr Precip: Trace
BHO SA 1155 100 SCT 40 175/61/59/2807/005/ THN F ALQDS/ 8/050 52006
70000 10061 20057
10 A.M.
Weather: Scattered altocumulus, few cumulus distant W-NW
Temperature: 72F; Dew Point: 60F; Relative Humidity: 66%
Wind: NNW @ 5 kts, wind light
Sea-level pressure: 1017.9 mb; 30.06 in. Hg: rising, then more slowly
Visibility: 40 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 95 SCT 40 179/72/60/3305/006/ FEW CU DSNT W-NW HAZY
WND LGT/ 8/250 51004
1 P.M.
Weather: Broken cumulus, broken altocumulus, virga distant SW-WSW
Temperature: 75F Dew Point: 60F; Relative Humidity: 59%
Wind: NNE @ 2 kts, wind light and variable
Sea-level pressure: 1018.0 mb; 30.06 in. Hg: rising, then steady
Visibility: 40 miles, hazy
6-hr Max temp: 79F
6-hr Min temp: 61F
6-hr Precip: 0.00 inches
BHO SA 1755 E35 BKN 95 BKN 40 180/75/60/0202/006/ VIRGA DSNT SW-WSW
HAZY WND L/V/ 8/250 51001 10079 20061
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SUMMARY FOR SATURDAY, SEPTEMBER 13, 2025
TEMPERATURE (DEGREES F)
MAX…….76 NORMAL…..74
MIN…….55 NORMAL…..57
MEAN……66 NORMAL…..65
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+1
TOTAL DEPARTURE FOR THE MONTH………………………-23 [-2.0 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..0 DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH…………….22 DEPARTURE……..+2
TOTAL HEATING UNITS FOR THE SEASON……………42 DEPARTURE……..+4
TOTAL HEATING UNITS LAST SEASON TO DATE……….21 DEPARTURE…….+21
COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..1 DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH…………….28 DEPARTURE…….-20
TOTAL COOLING UNITS FOR THE SEASON…………..700 DEPARTURE…….+56
TOTAL COOLING UNITS LAST SEASON TO DATE………731 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)………..26 S @ 07:32 P.M.
VECTOR #1 (1-Sec)……….26 S @ 07:32 P.M.
VECTOR #2 (1-Sec)……….26 S @ 07:32 P.M.
DAVIS #1……………….29 S @ 07:00 P.M.
DAVIS #2 ………………31 S @ 07:43 P.M.
RMY #1 (Instantaneous)…..25 S @ 07:32 P.M.
RMY #2 (Instantaneous)…..27 S @ 06:31 P.M.
MERLIN…………………24 S
RICHARDS (C5C) (Inst)……25 S @ 07:32 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………17 S @ 07:36 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19 S @ 07:34 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19 S @ 07:34 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 S @ 07:34 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 S @ 07:34 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 S @ 07:34 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 S @ 07:34 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18 S @ 07:34 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.9 SSW [213 total miles]
VECTOR #1……………….9.4
VECTOR #2……………….9.8
DAVIS #1………………..8.9 SSW
DAVIS #2………………..9.7 SSW
RMY #1………………….9.1 SSW
RMY #2………………….9.9 SSW
RICHARDS (C5C)…………..9.1
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..2.14 DEPARTURE…..+0.57
TOTAL PRECIPITATION FOR THE YEAR (2025)…….33.47 DEPARTURE…..-2.71
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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 The low since midnight is 57F, the daily normal low is 56F.
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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 14
HIGH 90F IN 1931
LOW 34F IN 1911
PRECIP 2.90 INCHES IN 1944 (Great Atlantic Hurricane in 1944)
PEAK GUST 96e MPH E IN 1944 (Great Atlantic Hurricane in 1944)
RECORDS FOR SEPTEMBER 15
HIGH 89F IN 1931
LOW 35F IN 1913
PRECIP 3.93 INCHES IN 1904 (Extra-tropical storm making landfall in New England on 9/15/1904 passing east of BHO and bringing a storm total of 4.11 inches 9/14-15/1904)
PEAK GUST 65e MPH NW IN 1944 (In the wake of Great Atlantic Hurricane)
TODAY’S REPORT PREPARED BY: Matt Douglas
