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Friday, July 21, 2023

July 21, 2023

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, JULY 21, 2023 ALL TIMES ARE…

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

FRIDAY, JULY 21, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0426E
SUNSET:  1915E

LOWER THAN AVERAGE TEMPERATURES BUT HIGHER DEW POINTS AND
HAZY SKIES MAKE A RETURN TO BLUE HILL…

Overcast skies have been prevalent on the hill today, with
hazy conditions mostly due in part to the return of dew points
in the upper 60’s to low 70’s. Thankfully, the temperatures
have been below normal and with the overcast skies the overall
feel hasn’t been too unbearable. Still, an easy day to get
overheated so it’s important to stay hydrated out there!

The wind has been light as it typically has been this summer.
The average speed for the day so far is just under 8mph. The
peak gust recorded so far today is about 15mph, occurring just
after 7:30am.

Although the smoke has left the area for now, visibility has
remained limited due to the hazy conditions as a result of the
higher dew points as earlier mentioned. Visibility has only been
around 10-12 miles throughout the early afternoon hours.

The maximum temperature so far today is 77F, this is 5 degrees
below the normal high of 82F. The minimum temperature today is
66F, this is 2 degrees above the normal low of 64F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Few breaks in overcast, few cumulus SSW-NW
Temperature: 72F; Dew Point: 71F; Relative Humidity: 96%
Wind: SSE @ 5 kts, wind light
Sea-level pressure: 1011.7 mb; 29.88 in. Hg: falling, then
rising
Visibility: 10 miles
6-hr Max temp: 72F
6-hr Min temp: 66F
24-hr Precip: 0.00 inches
BHO SA 1155 E250 OVC 10 117/72/71/1605/988/ FEW BINOVC ALQDS FEW
CU SSW-NW HAZY WND LGT/ 8/209 55005 10072 20066

10 A.M.
Weather: Overcast, few stratocumulus all quadrants
Temperature: 74F; Dew Point: 66F; Relative Humidity: 76%
Wind: SSE @ 6 kts, wind light
Sea-level pressure: 1009.6 mb; 29.81 in. Hg: falling, then more
slowly
Visibility: 12 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E150 BKN 200 OVC 12 096/74/76/1506/981/ FEW SC ALQDS
HAZY WND LGT/ 8/585 56011

1 P.M.
Weather: Few breaks in overcast, few stratocumulus all quadrants
Temperature: 77F; Dew Point: 67F; Relative Humidity: 78%
Wind: SSE @ 6 kts, wind light
Sea-level pressure: 1008.9mb; 29.79 in. Hg: falling, then more
rapidly
Visibility: 10 miles, hazy
6-hr Max temp: 77F
6-hr Min temp: 72F
6-hr Precip: 0.00 inches
BHO SA 1755 E110 BKN 200 OVC 10 089/77/67/1606/979/ FEW BINOVC
ALQDS FEW SC ALQDS HAZY WND LGT/ 8/559 58007 10077 20072

————————————————————–

SUMMARY FOR THURSDAY, JULY 20, 2023

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

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………..0
TOTAL DEPARTURE FOR THE MONTH…………………+48 [+2.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………….0  DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE SEASON……………0  DEPARTURE……..-5
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE………0

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….8  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………..198  DEPARTURE…….+42
TOTAL COOLING UNITS FOR THE SEASON………….326  DEPARTURE…….+31
TOTAL COOLING UNITS LAST SEASON TO DATE……..344  DEPARTURE…….-18

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
E=Estimated

F420C (Official)……….E17 NNE   @  07:34 A.M.
VECTOR #1 (1-Sec)……….17 SE    @  07:31 P.M.
VECTOR #2 (1-Sec)……….18 NE    @  05:23 A.M.
DAVIS #1……………….16 NE    @  05:18 A.M.
DAVIS #2 ………………17 S     @  11:16 P.M.
RMY #1 (Instantaneous)…..18 NE    @  05:26 A.M.
RMY #2 (Instantaneous)…..18 NE    @  05:23 A.M.
MERLIN…………………14 ENE
RICHARDS (C5C) (Inst)……16       @  05:26 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………13 NE  @  05:28 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..12     @  07:27 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..13     @  08:20 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………13 NE  @  05:28 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………13 SE  @  08:20 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..12 NNE @  05:54 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..14 SSE @  08:20 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………13     @  05:28 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………..8.1 E [195 total miles] VECTOR #1…………………8.4
VECTOR #2…………………8.9
DAVIS #1………………….8.4 E
DAVIS #2………………….8.5 E
RMY #1……………………8.2 ENE
RMY #2……………………8.8 E
RICHARDS (C5C)…………….8.8

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..5.10 DEPARTURE…..+2.88
TOTAL PRECIPITATION FOR THE YEAR…………..30.28 DEPARTURE…..+0.83

————————————————————–

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   80/61/71/0/0.00/567/62              17 SSE  VEC1 16 SSE RMY 17
7/2   74/63/69/-2/0.34/027/03             35 S    VEC1 35 S   RMY 35
7/3   79/63/72/-1/0.40/265/29             18 NNW  VEC1 18 NNW RMY 17 TSTM
7/4   71/65/68/-4/0.81/000/00             17 NE   VEC1 18 NE  RMY 17 TSTM
7/5   88/66/77/+5/0.00/720/79             17 S    VEC1 16 SE  RMY 15
7/6   92/69/81/+9/0.00/683/75             23 SSW  VEC1 22 SSW RMY 23
7/7   87/70/78/+6/0.00/763/84             23 SW   VEC1 22 SW  RMY 23
7/8   84/70/77/+5/0.00/463/51             20 W    VEC1 20 W   RMY 19
7/9   81/69/75/+2/T/200/22                17 ESE  VEC1 18 E   RMY 17
7/10  71/66/69/-4/0.68/000/00             22 ESE  VEC1 21 ESE RMY 22
7/11  85/62/74/+1/0.00/796/88             24 WNW  VEC1 25 WNW RMY 25
7/12  91/70/81/+8/0.00/713/79             21 WSW  VEC1 22 SSW RMY 20
7/13  88/67/78/+5/0.13/695/77             35 SSW  VEC1 35 SSW RMY 38 TSTM
7/14  78/65/72/-1/0.18/342/38             29 SSW  VEC1 32 SSW RMY 32 TSTM
7/15  86/70/78/+5/T/548/61                28 SSW  VEC1 30 SSW RMY 29 TSTM
7/16  76/71/74/+1/2.56/000/00             40 S    VEC1 41 SSW RMY 48 TSTM
7/17  86/71/79/+6/0.00/699/78             21 WSW  VEC1 21 W   RMY 23
7/18  84/70/77/+4/0.00/402/45             28 SSW  VEC1 28 SSW RMY 27
7/19  83/68/76/+3/0.00/…/..             23 W    VEC1 23 W   RMY 22
7/20  82/64/73/0/0.00/…/..              17 NNE  VEC1 17 SE  RMY 18

7/21 The low since midnight is 66F, which is 2 degrees below the daily
normal low of 64F.

DAILY RECORDS

07/16/2023: NEW RECORD DAILY PRECIPITATION OF 2.56 INCHES;
SURPASSES THE PREVIOUS RECORD OF 0.98 INCHES IN 2014

07/16/2023: RECORD HIGH DAILY MINIMUM TEMPERATURE OF 71F;
TIES THE RECORD OF 71F SET IN 1901, 1958, 1968, AND 2013

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

RECORDS FOR JULY 21
HIGH 100F IN 1977 [RECORD FOR MONTH] LOW 48F IN 1890
PRECIP 2.09 INS IN 1938
PEAK GUST 60e MPH WNW IN 1977

RECORDS FOR JULY 22
HIGH 99F IN 1926, 2011
LOW 52F IN 1890
PRECIP 1.73 INS IN 1887
PEAK GUST 55 MPH IN 1983

TODAY’S REPORT PREPARED BY: Amanda Joly

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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