Saturday, July 19, 2025

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

SATURDAY, JULY 19, 2025
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0425E
SUNSET:  1916E

ANOTHER BEAUTIFUL DAY ON BLUE HILL WITH SEASONABLE TEMPERATURES
AND EXCELLENT VISIBILITY….

It has been another beautiful summer day on Blue Hill. Skies
were mostly clear this morning with the exception of some distant
mid level altocumulus clouds. Due to daytime heating we did get an
increase in clouds, but conditions remained stable and fair. This
afternoon we had scattered cumulus and cirrus clouds with light
wind conditions.

Temperatures have still remained more seasonable today and the
dew points have also remained on the lower side, staying in the
mid 50s for much of the day.

The wind has been very light today, with some calm conditions
during the overnight and early morning hours. Winds were generally
out of the north-northeast during the morning and shifted to the
south-southwest by the afternoon. The average speed for the day
so far is around 5mph. The peak gust so far of only 21mph occurred
around 1:40pm this afternoon.

Visibility has been spectacular today, thanks to another day of lower
dew points. We started at around 60 miles this morning
and enjoyed around 70 miles for the rest of the morning and early
afternoon.

The maximum temperature so far today is 83F degrees, which is 2
degrees above the normal high of 82F. The minimum temperature
since midnight is 62F degrees, which is 2 degrees below the
normal low of 64F.

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Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus distant NW-NE and ESE-S-SSW
Temperature: 71F; Dew Point: 54F; Relative Humidity: 55%
Wind: Calm
Sea-level pressure: 1020.5 mb; 30.14 in. Hg: rising, then steady
Visibility: 60 miles
6-hr Max temp: 71F
6-hr Min temp: 62F
24-hr Precip:  0.00 inches
BHO SA 1155 CLR 60 205/71/54/0000/014/ FEW AC DSNT NW-NE AND
ESE-S-SSW WND CALM/ 8/050 51004 10071 20062

10 A.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 79F; Dew Point: 58F; Relative Humidity: 48%
Wind: SSW @ 3 kts, wind light
Sea-level pressure: 1019.6 mb; 30.11 in. Hg: falling, then more
rapidly
Visibility: 70 miles
3-hr Precip: 0.00 inches
BHO SA 1455 50 SCT 250 SCT 70 196/79/58/2003/011/ WND LGT/
8/201 58009

1 P.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 82F Dew Point: 55F; Relative Humidity: 38%
Wind: SSW @ 6 kts, wind light
Sea-level pressure: 1018.3 mb; 30.07 in. Hg: falling, then more
slowly
Visibility: 70 miles
6-hr Max temp: 83F
6-hr Min temp: 71F
6-hr Precip:  0.00 inches
BHO SA 1755 50 SCT 250 SCT 70 183/82/55/2006/007/ WND LGT/
8/204 56013 10083 20071

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SUMMARY FOR FRIDAY, JULY 18, 2025

TEMPERATURE (DEGREES F)
MAX…….81   NORMAL…..82
MIN…….67   NORMAL…..64
MEAN……74   NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+1
TOTAL DEPARTURE FOR THE MONTH………………………+54 [+2.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026)
TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH……………..1  DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE SEASON…………….1  DEPARTURE……..-4
TOTAL HEATING UNITS LAST SEASON TO DATE………..0  DEPARTURE……..+1

COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025)
TOTAL COOLING UNITS FOR YESTERDAY……………..9  DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE MONTH……………189  DEPARTURE…….+50
TOTAL COOLING UNITS FOR THE SEASON…………..389  DEPARTURE……+111
TOTAL COOLING UNITS LAST SEASON TO DATE………397  DEPARTURE……..-8

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)……….E36 WNW  @   12:25 A.M.
VECTOR #1 (1-Sec)……….36 WNW  @   12:25 A.M.
VECTOR #2 (1-Sec)……….42 NW   @   12:02 A.M.
DAVIS #1……………….38 WNW  @   12:00 A.M.
DAVIS #2 ………………37 WNW  @   12:00 A.M.
RMY #1 (Instantaneous)…..37 WNW  @   12:25 A.M.
RMY #2 (Instantaneous)…..43 NW   @   12:02 A.M.
MERLIN…………………29 NW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………27 WNW  @   12:01 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..28      @   12:01 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..30      @   12:01 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………30 W    @   12:01 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………31 WNW  @   12:01 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..27 WNW  @   12:01 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..30 NW   @   12:01 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.2 NW [245 total miles] VECTOR #1………………10.4
VECTOR #2………………11.0
DAVIS #1……………….10.5 NW
DAVIS #2……………….10.6 NW
RMY #1…………………10.0 NW
RMY #2…………………10.7 NW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.10
TOTAL PRECIPITATION FOR THE MONTH…………..5.20 DEPARTURE…..+3.20
TOTAL PRECIPITATION FOR THE YEAR (2025)…….28.43 DEPARTURE…..-0.80

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PRELIMINARY CLIMATE SUMMARY FOR JULY 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

7/1   90/68/79/+8/0.14/411/45           38 W   VEC1 38 W   RMY 41 TSTM
7/2   85/69/77/+6/0.02/247/27           23 WSW VEC1 24 WSW RMY 24
7/3   88/63/76/+4/0.03/748/82           39 SW  VEC1 39 SW  RMY 40 TSTM
7/4   80/60/70/-2/0.00/875/96           28 NNW VEC1 27 NNW RMY 29
7/5   83/61/72/0/0.00/664/73            23 W   VEC1 23 W   RMY 24
7/6   92/65/79/+7/0.00/818/90           29 SW  VEC1 29 SW  RMY 29
7/7   88/69/79/+7/0.01/490/54           28 SSW VEC1 28 SSW RMY 29 TSTM
7/8   94/67/81/+9/0.36/562/62           24 WSW VEC1 24 WSW RMY 27 TSTM
7/9   74/65/70/-3/0.73/172/19           26 SW  VEC1 27 SW  RMY 28 TSTM
7/10  66/61/64/-9/3.85/000/00           24 ENE VEC1 24 ENE RMY 24 TSTM
7/11  80/62/71/-2/0.00/190/21           18 SSW VEC1 18 SSW RMY 18
7/12  84/65/75/+2/0.00/505/56           20 S   VEC1 20 S   RMY 19
7/13  85/63/74/+1/0.00/505/56           21 SSW VEC1 21 SSW RMY 21
7/14  81/65/73/0/T/216/24               23 SW  VEC1 23 SW  RMY 25
7/15  90/71/81/+8/0.06/665/74           24 SSW VEC1 24 SSW RMY 24
7/16  93/71/82/+9/0.00/690/77           24 SSW VEC1 24 SSW RMY 23
7/17  89/73/81/+8/0.00/…/..           41 WNW VEC1 41 WNW RMY 42
7/18  81/67/74/+1/0.00/…/..           36 WNW VEC1 36 WNW RMY 37

7/19 The low since midnight is 62F, the daily normal low is 64F.

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JULY DAILY RECORDS TO DATE

7/10 RECORD HIGHEST PRECIPITATION OF 3.85 INCHES;
BEATING OLD RECORD OF 1.95 INCHES SET IN 2015

7/16 TIED RECORD HIGH MINIMUM TEMPERATURE OF 71F;
ALSO SET IN 1901, 1958, 1968, 2013, AND 2023

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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR JULY 19
HIGH 96F IN 1977, 1991
LOW 50F IN 1890
PRECIP 1.10 INS IN 1951
WIND 63 MPH SSW IN 1982

RECORDS FOR JULY 20
HIGH 99F IN 1991
LOW 47F IN 1890
PRECIP 1.64 INS IN 1938
WIND 56e MPH SSW IN 1943

TODAY’S REPORT PREPARED BY: Amanda Joly