Thursday, June 19, 2025

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

THURSDAY, JUNE 19, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0407E
SUNSET:  1924E

HAZY, HOT, AND HUMID CONDITIONS ARRIVE AT BLUE HILL….

We started the day in the clouds with very dense fog and very
limited visibility, however the fog burned off fairly quickly
with sunshine taking over. This of course set the stage for what
is a hot and humid day. A heat advisory is in effect until 8pm
this evening.

Temperatures have made it to the upper 80s so far, destined for
the low 90s. With the dew point in the low 70s, the heat index
is already up to 96F as of the 1pm observation. Use extreme
caution if outdoors today.

Winds were on the lighter side through the morning, but have
become a bit gusty early this afternoon as the convective
temperature has been reached and some mixing starts to take place
from aloft. The average speed for the day so far is around 9mph
out of a southwesterly direction. The peak gust so far occurred
after the 1pm observation and is 24mph.

As mentioned, the visibility was very limited early this morning
with the view only 1/16th to 1/8th of a mile. As the fog lifted,
the view improved markedly to around 40 miles by the mid morning
hours, and has remained there into this afternoon.

The maximum temperature for today is 89F degrees, which is 12
degrees above the normal high of 77F. The minimum temperature
since midnight is 66F degrees, which is 7 degrees above the
normal low of 59F.

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Today’s Observations:

7 A.M.
Weather: Overcast stratus, sun dimly visible
Temperature: 70F; Dew Point: 69F; Relative Humidity: 97%
Wind: WSW @ 6 kts, wind light
Sea-level pressure: 1011.4 mb; 29.87 in. Hg: rising, then more slowly
Visibility: 12 miles, 6 miles SSW-WNW, 20 miles NE-SE, thin fog
6-hr Max temp: 70F
6-hr Min temp: 66F
24-hr Precip:  0.01 inches
BHO SA 1155 E2 OVC 12 114/70/69/2406/987/ THN F ALQDS SUN DMLY VSBL
VSBY 6 SSW-WNW 20 NE-SE WND LGT/ 8/6// 51004 70001 10070 20066

10 A.M.
Weather: Broken stratocumulus
Temperature: 79F; Dew Point: 73F; Relative Humidity: 81%
Wind: WSW @ 9 kts
Sea-level pressure: 1010.0 mb; 29.83 in. Hg: falling, then more rapidly
Visibility: 40 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E15 BKN 40 100/79/73/2409/983/ HAZY/ 8/500 58014

1 P.M.
Weather: Clear, few cumulonimbus distant W-WNW, few cumulus all quadrants,
few dense cirrus distant W-WNW, heat index 96F
Temperature: 89F Dew Point: 72F; Relative Humidity: 58%
Wind: SW @ 9G18 kts
Sea-level pressure: 1008.5 mb; 29.78 in. Hg: falling, then more rapidly
Visibility: 40 miles, hazy
6-hr Max temp: 89F
6-hr Min temp: 70F
6-hr Precip:  0.00 inches
BHO SA 1755 CLR 40 085/89/72/2309G18/978/ FEW CB DSNT W-WNW
FEW CU ALQDS FEW DENSE CI W-WNW HAZY HX 96/ 8/903 58015 10089 20070

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SUMMARY FOR WEDNESDAY, JUNE 18, 2025

TEMPERATURE (DEGREES F)
MAX…….75   NORMAL…..76
MIN…….63   NORMAL…..59
MEAN……69   NORMAL…..67

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+2
TOTAL DEPARTURE FOR THE MONTH……………………….+7 [+0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH…………….50  DEPARTURE……..-6
TOTAL HEATING UNITS FOR THE SEASON………….5665  DEPARTURE……-535
TOTAL HEATING UNITS LAST SEASON TO DATE……..5390  DEPARTURE……+275

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..4  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………….48  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE SEASON……………65  DEPARTURE…….-11
TOTAL COOLING UNITS LAST SEASON TO DATE……….90  DEPARTURE…….-25

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)……….E22 SSW  @   12:31 A.M.
VECTOR #1 (1-Sec)……….23 SSW  @   12:31 A.M.
VECTOR #2 (1-Sec)……….22 S    @   12:31 A.M.
DAVIS #1……………….23 S    @   12:31 A.M.
DAVIS #2 ………………26 S    @   12:04 A.M.
RMY #1 (Instantaneous)…..23 S    @   12:13 A.M.
RMY #2 (Instantaneous)…..23 S    @   12:31 A.M.
MERLIN…………………21 S
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 S    @   12:07 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16      @   12:05 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17      @   12:06 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 S    @   12:05 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 S    @   12:05 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 S    @   12:05 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 S    @   12:06 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.3 SSW [200 total miles] VECTOR #1……………….8.8
VECTOR #2……………….9.3
DAVIS #1………………..8.3 SSW
DAVIS #2………………..9.5 SSW
RMY #1………………….8.6 SSW
RMY #2………………….9.4 SSW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.01 DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH…………..1.40 DEPARTURE…..-1.52
TOTAL PRECIPITATION FOR THE YEAR (2025)…….23.14 DEPARTURE…..-2.38

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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/+10/0.00/814/89          47 WNW VEC1 47 WNW RMY 49
6/13  76/57/67/+1/T/631/69              20 E   VEC1 20 E   RMY 20
6/14  58/54/56/-10/0.09/000/00          24 NE  VEC1 24 NE  RMY 24
6/15  67/53/60/-6/0.00/449/49           18 E   VEC1 18 E   RMY 17
6/16  73/52/63/-4/0.00/641/70           20 SE  VEC1 20 ESE RMY 20
6/17  74/57/66/-1/0.12/028/03           22 S   VEC1 22 S   RMY 23
6/18  75/63/69/+2/0.02/018/02           22 SSW VEC1 23 SSW RMY 23

6/19 The low since midnight is 66F, the daily normal low is 59F.

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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 19
HIGH 93F IN 2024
LOW 40F IN 1920
PRECIP 3.92 INS 1922
PEAK GUST 66e MPH NW IN 1940

RECORDS FOR JUNE 20
HIGH 94F IN 1953, 2024
LOW 41F IN 1918
PRECIP 2.61 INS 1945
PEAK GUST 63 MPH NE IN 1967, SSW IN 2010

TODAY’S REPORT PREPARED BY: MFD