Thursday, July 6, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, JULY 6, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0414E
SUNSET: 1924E
HAZY, HOT, AND HUMID UNDER A MIX OF SUN AND CLOUDS….
Dense fog was observed early this morning, but it quickly burned
off prior to the 7am observation. Triple H (not the wrestler)
weather has arrived here on the Hill today under a mix of sun
and clouds.
Temperatures jumped up rapidly this morning after an overnight
low of only 69F degrees. It was already 75F by 7am, 86F by 10am,
and 92F by 1pm. Today marks only the 2nd time so far this year
that the mercury has reached the 90F degree mark. With a dew-
point in the low 70s, it’s rather oppressive out there today as
the heat index approaches 100F!
The wind has been light for most of the day with an average speed
of only about 7mph. The highest gust so far has only been around
17mph.
Visibility has been limited today due to fog early, and then just
general haziness the remainder of the day. Views of 10-15 miles
has been the theme all day after the fog burned off.
The maximum temperature so far today is 92F, this is 11 degrees
above the normal high of 81F. The minimum since midnight is 69F,
which is 6 degrees above the normal low of 63F.
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Today’s Observations:
7 A.M.
Weather: Clear
Temperature: 75F; Dew Point: 72F; Relative Humidity: 91%
Wind: W @ 2 kts, wind light and variable
Sea-level pressure: 1015.2 mb; 29.98 in. Hg: falling, then steady
Visibility: 10 miles, thin fog
6-hr Max temp: 75F
6-hr Min temp: 69F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 10 152/75/72/2602/998/ THN F ALQDS WND L/V/
8/000 56001 10075 20069
10 A.M.
Weather: Clear, few cumulus all quadrants
Temperature: 86F; Dew Point: 71F; Relative Humidity: 61%
Wind: S @ 5 kts, wind light
Sea-level pressure: 1014.8 mb; 29.97 in. Hg: falling, then more rapidly
Visibility: 15 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 15 148/86/71/1905/997/ FEW CU ALQDS HAZY WND LGT/
8/200 58004
1 P.M.
Weather: Broken cumulus, cumulonimbus distant WSW moving NNE,
towering cumulus all quadrants
Temperature: 92F; Dew Point: 72F; Relative Humidity: 53%
Heat Index: 100F
Wind: SW @ 5 kts, wind light
Sea-level pressure: 1013.8mb; 29.94 in. Hg: falling, then more rapidly
Visibility: 15 miles, hazy
6-hr Max temp: 92F
6-hr Min temp: 75F
6-hr Precip: 0.00 inches
BHO SA 1755 E45 BKN 15 138/92/72/2205/994/ CB DSNT WSW MOV NNE
TCU ALQDS HAZY WND LGT HEAT INDEX 100/ 8/300 58010 10092 20075
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SUMMARY FOR WEDNESDAY, JULY 5, 2023
TEMPERATURE (DEGREES F)
MAX…….88 NORMAL…..81
MIN…….66 NORMAL…..63
MEAN……77 NORMAL…..72
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+5
TOTAL DEPARTURE FOR THE MONTH…………………-2 [-0.6 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……..-2
TOTAL HEATING UNITS FOR THE SEASON……………0 DEPARTURE……..-2
TOTAL HEATING UNITS LAST SEASON TO DATE……….0 DEPARTURE………0
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY……………12 DEPARTURE……..+5
TOTAL COOLING UNITS FOR THE MONTH……………31 DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE SEASON………….159 DEPARTURE…….-15
TOTAL COOLING UNITS LAST SEASON TO DATE……..197 DEPARTURE…….-38
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 S @ 08:48 P.M.
VECTOR #1 (1-Sec)……….16 SE @ 07:45 P.M.
VECTOR #2 (1-Sec)……….17 S @ 08:55 P.M.
DAVIS #1……………….16 S @ 09:53 P.M.
DAVIS #2 ………………19 S @ 08:48 P.M.
RMY #1 (Instantaneous)…..15 S @ 09:14 P.M.
RMY #2 (Instantaneous)…..17 S @ 08:55 P.M.
MERLIN…………………15 W
RICHARDS (C5C) (Inst)……15 @ 08:48 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………12 SSE @ 07:59 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..12 @ 07:45 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..12 @ 07:45 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………11 SE @ 07:46 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 S @ 09:49 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..12 S @ 08:49 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..12 S @ 09:49 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………11 @ 07:46 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……….. 5.5 WNW [132 total miles]
VECTOR #1………………… 6.2
VECTOR #2………………… 6.3
DAVIS #1…………………. 5.7 W
DAVIS #2…………………. 5.9 W
RMY #1…………………… 6.0 WNW
RMY #2…………………… 6.2 WNW
RICHARDS (C5C)……………. 6.7
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..1.55 DEPARTURE…..+0.99
TOTAL PRECIPITATION FOR THE YEAR…………..26.73 DEPARTURE…..-1.06
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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 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/…/.. 17 S VEC1 16 SE RMY 15
7/6 The low since midnight is 69, the daily normal low is 63F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JULY 6
HIGH 99F IN 2010
LOW 47F IN 1979
PRECIP 1.43 INS IN 2005
PEAK GUST 56e MPH NNW IN 1942, 56 MPH WNW IN 1999
RECORDS FOR JULY 7
HIGH 97F IN 1908,1993
LOW 48F IN 1902
PRECIP 2.11 INS IN 1966
PEAK GUST 63 MPH NW IN 2021
TODAY’S REPORT PREPARED BY: Matt Douglas
