Saturday, June 21, 2025

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

SATURDAY, JUNE 21, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0408E
SUNSET:  1925E

AT LONG LAST, A SATURDAY WITH NO RAIN….

In a welcomed departure from the recent trend of rainy Saturdays,
today is dry! Mostly sunny skies with warm temperatures make
it a great day to get outside and enjoy the sunshine.

Temperatures remain a touch on the warm side. We began the morning
in the low 60s, before quickly rising to the mid 80s by the early
afternoon. The dew point remains in the upper 50s.

Winds, which were rather strong yesterday with a peak gust to
52mph, have backed off considerably today. Speeds for the most
part have been light, with an average so far of 8mph. The
peak gust for today is only 18mph, taking place just after
midnight.

The visibility is somewhat limited by haze, remaining at 30 miles
all day.

The maximum temperature for today is 83F degrees, which is 6
degrees above the normal high of 77F. The minimum temperature
since midnight is 61F degrees, which is 1 degree above the
normal low of 60F.

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Today’s Observations:

7 A.M.
Weather: Clear
Temperature: 69F; Dew Point: 59F; Relative Humidity: 71%
Wind: NNW @ 6 kts, wind light
Sea-level pressure: 1019.7 mb; 30.11 in. Hg: rising, then more slowly
Visibility: 30 miles, thin smoke layer aloft all quadrants, hazy
6-hr Max temp: 69F
6-hr Min temp: 61F
24-hr Precip:  0.00 inches
BHO SA 1155 CLR 30 197/69/59/3306/011/ THN K LYR ALF ALQDS HAZY
WND LGT/ 8/000 51022 10069 20061

10 A.M.
Weather: Clear, few small cumulus all quadrants
Temperature: 77F; Dew Point: 59F; Relative Humidity: 54%
Wind: WNW @ 3 kts, wind light and variable
Sea-level pressure: 1019.4 mb; 30.10 in. Hg: rising, then falling
Visibility: 30 miles, thin smoke layer aloft all quadrants, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 30 194/77/59/2903/010/ FEW SML CU ALQDS THN K LYR ALF ALQDS
HAZY WND L/V/ 8/100 58003

1 P.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 83F Dew Point: 59F; Relative Humidity: 44%
Wind: W @ 6 kts, wind light and variable
Sea-level pressure: 1019.4 mb; 30.10 in. Hg: steady
Visibility: 30 miles, hazy
6-hr Max temp: 83F
6-hr Min temp: 69F
6-hr Precip:  0.00 inches
BHO SA 1755 55 SCT 250 SCT 194/83/59/2806/010/ HAZY WND L/V/ 8/201 54000
10083 20069

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SUMMARY FOR FRIDAY, JUNE 20, 2025

TEMPERATURE (DEGREES F)
MAX…….81   NORMAL…..77
MIN…….66   NORMAL…..59
MEAN……74   NORMAL…..68

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+6
TOTAL DEPARTURE FOR THE MONTH………………………+23 [+1.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………….50  DEPARTURE……..-9
TOTAL HEATING UNITS FOR THE SEASON………….5665  DEPARTURE……-538
TOTAL HEATING UNITS LAST SEASON TO DATE……..5390  DEPARTURE……+275

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..9  DEPARTURE……..+5
TOTAL COOLING UNITS FOR THE MONTH…………….70  DEPARTURE…….+13
TOTAL COOLING UNITS FOR THE SEASON……………87  DEPARTURE……..+2
TOTAL COOLING UNITS LAST SEASON TO DATE………121  DEPARTURE…….-34

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)……….E52 WNW  @   10:44 A.M.
VECTOR #1 (1-Sec)……….52 WNW  @   10:44 A.M.
VECTOR #2 (1-Sec)……….52 WNW  @   09:46 A.M.
DAVIS #1……………….53 W    @   10:44 A.M.
DAVIS #2 ………………50 WNW  @   09:46 A.M.
RMY #1 (Instantaneous)…..54 WNW  @   10:43 A.M.
RMY #2 (Instantaneous)…..54 W    @   12:00 P.M.
MERLIN…………………50 W
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………34 WNW  @   10:46 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..35      @   10:45 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..38      @   10:46 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………38 W    @   10:45 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………39 WNW  @   10:46 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..33 WNW  @   10:45 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..37 W    @   10:46 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..20.4 WNW [489 total miles] VECTOR #1………………19.4
VECTOR #2………………20.6
DAVIS #1……………….20.3 W
DAVIS #2……………….20.6 WNW
RMY #1…………………18.4 W
RMY #2…………………20.1 W
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.16
TOTAL PRECIPITATION FOR THE MONTH…………..1.40 DEPARTURE…..-1.84
TOTAL PRECIPITATION FOR THE YEAR (2025)…….23.14 DEPARTURE…..-2.70

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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  90/66/78/+10/0.00/…/..          31 SSW VEC1 31 SSW RMY 31
6/20  81/66/74/+6/0.00/…/..           52 WNW VEC1 52 WNW RMY 54

6/21 The low since midnight is 61F, the daily normal low is 60F.

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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 21
HIGH 94F IN 2012
LOW 42F IN 1940
PRECIP 1.40 INS 1903
PEAK GUST 51 MPH SSW IN 2000

RECORDS FOR JUNE 22
HIGH 93F IN 1921, 2012
LOW 43F IN 1940
PRECIP 1.57 INS IN 1900
PEAK GUST 74 MPH NW IN 1988

TODAY’S REPORT PREPARED BY: Joshua Polen