Saturday, October 4, 2025

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

SATURDAY OCTOBER 4, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0545E
SUNSET:  1720E

SUNNY SKIES AND WARM TEMPERATURES CONTINUE….

It is a beautiful day to enjoy the outdoors, with abundant
sunshine and warm temperatures! Aside from a few cirrus, skies
remain clear.

The temperature is well above average today, beginning the morning
in the low 50s and quickly rising to the upper 70s, giving a
summer-like feel without the humidity. Speaking of which, the
dew point remains in comfortable territory, holding in the low 50s.

The winds were more active during the early morning, going light
by around 9am. The average speed so far is 8mph, with direction
being highly variable, but currently out of the west. The peak
gust is 17mph, occurring just before 7:30am.

Visibility is decent, holding steady at 50 miles.

The maximum temperature so far today is 79F degrees, which is
13 degrees above the normal high of 66F. The minimum temperature
since midnight is 53F degrees, which is 4 degrees above the
normal low of 49F.

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Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus distant NNW-NE, few cirrus all quadrants
Temperature: 57F; Dew Point: 50F; Relative Humidity: 78%
Wind: NW @ 9 kts
Sea-level pressure: 1022.3 mb; 30.19 in. Hg: rising, then more rapidly
Visibility: 50 miles
6-hr Max temp: 57F
6-hr Min temp: 53F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 50 223/57/50/3109/019/ FEW AC DSNT NNW-NE FEW CI ALQDS/
8/051 53015 10057 20053

10 A.M.
Weather: Clear, few cirrus all quadrants
Temperature: 71F; Dew Point: 53F; Relative Humidity: 52%
Wind: NE @ 2 kts, wind light and variable
Sea-level pressure: 1022.7 mb; 30.20 in. Hg: rising, then falling
Visibility: 50 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 50 227/71/53/0502/020/ FEW CI ALQDS WND L/V/ 8/001 50004

1 P.M.
Weather: Clear, few cirrus all quadrants
Temperature: 79F Dew Point: 52F; Relative Humidity: 40%
Wind: W @ 3 kts, wind light
Sea-level pressure: 1021.1 mb; 30.15 in. Hg: falling unsteadily
Visibility: 50 miles
6-hr Max temp: 79F
6-hr Min temp: 57F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 50 211/79/52/2803/015/ FEW CI ALQDS WND LGT/
8/001 57016 10079 20057

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SUMMARY FOR FRIDAY, OCTOBER 3, 2025

TEMPERATURE (DEGREES F)
MAX…….72   NORMAL…..66
MIN…….46   NORMAL…..49
MEAN……59   NORMAL…..57

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+2
TOTAL DEPARTURE FOR THE MONTH……………………….-7 [-2.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..6  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH…………….29  DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE SEASON……………92  DEPARTURE…….-49
TOTAL HEATING UNITS LAST SEASON TO DATE……….83  DEPARTURE……..+9

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH……………..0  DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE SEASON…………..736  DEPARTURE…….+64
TOTAL COOLING UNITS LAST SEASON TO DATE………757  DEPARTURE…….-21

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 *=Last of multiple occurrences

F420C (Official)………..23 SW   @   01:17 P.M.
VECTOR #1 (1-Sec)……….23 SW   @   01:17 P.M.
VECTOR #2 (1-Sec)……….23 SW   @   01:17 P.M.
DAVIS #1……………….22 SW   @   01:17 P.M.
DAVIS #2 ………………22 WSW  @   01:17 P.M.
RMY #1 (Instantaneous)…..23 SW   @   01:17 P.M.
RMY #2 (Instantaneous)…..24 SW   @   01:17 P.M.
MERLIN…………………21 SW
RICHARDS (C5C) (Inst)……23      @   01:17 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 WSW  @   09:52 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15      @   01:18 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16      @   01:18 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 SW   @   01:18 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 WSW  @   01:18 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 SW   @   01:18 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 WSW  @   01:18 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15      @   01:18 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.2 WSW [244 total miles] VECTOR #1………………10.9
VECTOR #2………………11.4
DAVIS #1……………….10.9 WSW
DAVIS #2……………….11.4 WSW
RMY #1…………………10.8 WSW
RMY #2…………………11.3 SW
RICHARDS (C5C)………….10.7

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.16
TOTAL PRECIPITATION FOR THE MONTH…………..0.00 DEPARTURE…..-0.50
TOTAL PRECIPITATION FOR THE YEAR (2025)…….35.82 DEPARTURE…..-3.35

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PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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

10/1  61/49/55/-3/0.00/668/97            30 NE  VEC1 30 NE  RMY 30
10/2  60/43/52/-6/0.00/…/..            28 NE  VEC1 28 NE  RMY 28
10/3  72/46/59/+2/0.00/…/..            23 SW  VEC1 23 SW  RMY 23

10/4 The low since midnight is 53F, the daily normal low is 49F.

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OCTOBER 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 OCTOBER 4
HIGH 84F IN 2007
LOW 28F IN 1888
PRECIP 1.87 INCHES IN 2011
PEAK GUST 59 MPH SSW IN 1990

RECORDS FOR OCTOBER 5
HIGH 86F IN 2007
LOW 29F IN 1965
PRECIP 3.17 INCHES IN 1962
PEAK GUST 64e MPH S IN 1979

TODAY’S REPORT PREPARED BY: Joshua Polen