Friday, June 13, 2025

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

FRIDAY, JUNE 13, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0407E
SUNSET:  1922E

FILTERED SUNSHINE WITH MORE SEASONABLE TEMPS TODAY…

This morning we were under mostly cloudy skies, which began to
clear during the mid morning. More upper level clouds moved in
during the early afternoon and a few cumulus clouds were observed,
thanks to some daytime heating.

Temperatures have been more seasonable today, and with dew points
in the lower 50’s, it’s been overall very comfortable outside.

Winds have been mostly out of the northwest today, and have been
significantly lighter than yesterday. Our average wind speed so far
today is only around 7mph. Our peak gust of 19mph occurred just
before 7:30am this morning.

Visibility has been once again limited due to the Canadian wildfire
smoke. Because of this, we have had hazy conditions all day. However,
because of the lower dew points we have managed to about 30 miles for
much of the day, whereas earlier in the week we were in the 10-20 mile
range.

The maximum temperature for today is 76F degrees, which is 1 degree
above the normal high of 75F. The minimum temperature since midnight
is 59F degrees, which is 2 degrees above the normal low of 57F.

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Today’s Observations:

7 A.M.
Weather: Broken altocumulus/altostratus, broken cirrocumulus,
thin smoke layer aloft all quadrants, sun dimly visible
Temperature: 63F; Dew Point: 50F; Relative Humidity: 62%
Wind: NNW @ 5 kts, wind light
Sea-level pressure: 1021.3 mb; 30.16 in. Hg: rising, then more
slowly
Visibility: 30 miles, hazy
6-hr Max temp: 64F
6-hr Min temp: 59F
24-hr Precip:  0.00 inches
BHO SA 1155 E150 BKN 220 BKN 30 213/63/50/3305/016/ THN K LYR ALF
ALQDS SUN DMLY VSBL HAZY WND LGT/ 8/079 51020 10064 20059

10 A.M.
Weather: Broken cirrocumulus, few altocumulus all quadrants, thin
smoke layer aloft all quadrants
Temperature: 69F; Dew Point: 52F; Relative Humidity: 56%
Wind: NW @ 6 kts, wind light
Sea-level pressure: 1022.0 mb; 30.18 in. Hg: rising, then steady
Visibility: 30 miles, hazy
3-hr Precip:  0.00 inches
BHO SA 1455 E220 BKN 30 220/69/52/3006/018/ FEW AC ALQDS THN K LYR
ALF ALQDS HAZY WND LGT/ 8/059 51007

1 P.M.
Weather: Broken cirrocumulus, few cumulus all quadrants, thin smoke
layer aloft all quadrants
Temperature: 76F Dew Point: 52F; Relative Humidity: 44%
Wind: SW @ 4 kts, wind light
Sea-level pressure: 1021.2 mb; 30.16 in. Hg: falling, then more
rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 76F
6-hr Min temp: 63F
6-hr Precip:  0.00 inches
BHO SA 1755 E220 BKN 30 212/76/52/2404/016/ FEW SC ALQDS THN K LYR ALF
ALQDS HAZY WND LGT/ 8/209 58008 10076 20063

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SUMMARY FOR THURSDAY, JUNE 12, 2025

TEMPERATURE (DEGREES F)
MAX…….85   NORMAL…..74
MIN…….64   NORMAL…..57
MEAN……75   NORMAL…..65

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………+10
TOTAL DEPARTURE FOR THE MONTH………………………+25 [+1.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH…………….34  DEPARTURE…….-10
TOTAL HEATING UNITS FOR THE SEASON………….5649  DEPARTURE……-540
TOTAL HEATING UNITS LAST SEASON TO DATE……..5387  DEPARTURE……+262

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY…………….10  DEPARTURE……..+7
TOTAL COOLING UNITS FOR THE MONTH…………….41  DEPARTURE…….+14
TOTAL COOLING UNITS FOR THE SEASON……………58  DEPARTURE……..+3
TOTAL COOLING UNITS LAST SEASON TO DATE……….59  DEPARTURE……..-1

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)……….E47 WNW  @   03:37 P.M.
VECTOR #1 (1-Sec)……….47 WNW  @   03:37 P.M.
VECTOR #2 (1-Sec)……….47 W    @   01:49 P.M.
DAVIS #1……………….47 W    @   03:43 P.M.
DAVIS #2 ………………45 W    @   01:49 P.M.
RMY #1 (Instantaneous)…..49 WNW  @   03:43 P.M.
RMY #2 (Instantaneous)…..47 W    @   04:32 P.M.
MERLIN…………………44 NW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………31 WNW  @   03:44 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..31      @   03:44 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..32      @   02:51 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………33 W    @   01:49 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………33 W    @   01:50 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..29 WNW  @   05:04 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..31 W    @   02:51 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..16.6 WNW [399 total miles] VECTOR #1………………16.0
VECTOR #2………………17.1
DAVIS #1……………….16.6 W
DAVIS #2……………….17.1 W
RMY #1…………………15.3 W
RMY #2…………………16.8 W
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH…………..1.17 DEPARTURE…..-0.77
TOTAL PRECIPITATION FOR THE YEAR (2025)…….22.91 DEPARTURE…..-1.63

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PRELIMINARY CLIMATE SUMMARY FOR JUNE 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

6/1   63/47/55/-7/0.01/588/65           40 W   VEC1 40 W   RMY 42
6/2   70/48/59/-3/T/780/86              25 WNW VEC1 25 WSW RMY 26
6/3   79/50/65/+3/0.00/853/94           23 SSW VEC1 23 SSW RMY 21
6/4   84/58/71/+8/0.00/708/78           26 SW  VEC1 27 SW  RMY 28
6/5   93/61/77/+14/0.00/819/90          18 WSW VEC1 18 SW  RMY 19
6/6   81/63/72/+9/0.00/382/42           26 ENE VEC1 27 NE  RMY 27
6/7   71/60/66/+2/0.95/000/00           26 NE  VEC1 26 NE  RMY 25 TSTM
6/8   67/55/61/-3/0.00/347/38           22 ENE VEC1 21 ENE RMY 22
6/9   61/55/58/-6/0.01/000/00           20 E   VEC1 21 E   RMY 20
6/10  62/54/58/-7/0.20/000/00           21 W   VEC1 20 W   RMY 20
6/11  81/58/70/+5/0.00/850/93           32 WSW VEC1 32 WSW RMY 33
6/12  85/64/75/+10/0.00/…/..          47 WNW VEC1 47 WNW RMY 49

6/13 The low since midnight is 59F, the daily normal low is 57F.

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JUNE 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 JUNE 13
HIGH 93F IN 1988
LOW 43F IN 1982
PRECIP 6.07 INS 1998 [Record for month] PEAK GUST 69 MPH N IN 1956

RECORDS FOR JUNE 14
HIGH 93F IN 1956
LOW 41F IN 1912
PRECIP 1.49 INS 1896
PEAK GUST 55 MPH WNW IN 1958

TODAY’S REPORT PREPARED BY: Amanda Joly