Sunday, July 30, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, JULY 30, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0435E
SUNSET: 1906E
HEAVY RAIN LAST EVENING LEADS TO A REFRESHING AIR MASS TODAY…
Thunderstorms last evening brought yet another heavy rainfall
event here to the hill with 1.04″ of rain being recorded. 1″
of this all fell in a 2 hour period between 7pm-9pm. This
marked the 5th event of 1″ or more this month, and the 4th
to do so within a 24 hour period. The monthly total is now
9.58″ and is now ranked the 5th wettest for the month of July.
See the rankings list below.
Today is a whole different world as we’ve seen a mix of sun
and clouds with temperatures only reaching the low 70s through
1pm. The dew point, which is the more important metric this
time of year, is in the very refreshing and pleasant mid 50s
range. After almost a month of high dew points, it really
does feel wonderful outside. Perfect hiking weather!
The wind has been generally on the light side out of mainly a
northerly direction. The average speed for the day so far has
been around 9mph.
Visibility has been excellent today, improving from 50 miles
early this morning to 70 miles this afternoon, indicative of
the much drier air mass in place.
The maximum temperature so far today is 75F, this is 7 degrees
below the normal high of 82F. The minimum temperature today is
56F, which is 8 degrees below the normal low of 64F.
As mentioned above, the monthly rainfall total of 9.58″ is
now ranked 5th most for the month of July. Here is the list
of rankings per our Chief Scientist Mike Iacono.
BHO Highest July Precipitation, inches (1886-2023):
1) 11.67 in 1938
2) 11.59 in 2021
3) 10.66 in 1988
4) 10.43 in 1921
5) 9.58 in 2023 (through 7/29)
6) 9.52 in 1915
7) 8.47 in 1889
8) 7.62 in 2009
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Today’s Observations:
7 A.M.
Weather: Scattered cirrus, few stratocumulus all quadrants
Temperature: 60F; Dew Point: 54F; Relative Humidity: 82%
Wind: NNW @ 8 kts
Sea-level pressure: 1011.5 mb; 29.87 in. Hg: rising, then more slowly
Visibility: 50 miles
6-hr Max temp: 61F
6-hr Min temp: 56F
24-hr Precip: 1.04 inches
BHO SA 1155 220 SCT 50 115/60/54/3308/987/ FEW SC ALQDS/
8/502 51015 70104 10061 20056
10 A.M.
Weather: Broken cumulus, broken cirrus
Temperature: 68F; Dew Point: 56F; Relative Humidity: 65%
Wind: NNW @ 8 kts
Sea-level pressure: 1013.2 mb; 29.92 in. Hg: rising steadily
Visibility: 60 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E30 BKN 220 BKN 60 132/68/56/3408/992/ 8/202 52017
1 P.M.
Weather: Broken cumulus, broken cirrus
Temperature: 72F; Dew Point: 56F; Relative Humidity: 57%
Wind: WNW @ 6 kts, wind light
Sea-level pressure: 1013.1mb; 29.92 in. Hg: rising, then falling
Visibility: 70 miles
6-hr Max temp: 73F
6-hr Min temp: 60F
6-hr Precip: 0.00 inches
BHO SA 1755 E40 BKN 220 BKN 70 131/72/56/2906/992/ WND LGT/
8/202 58001 10073 20060
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SUMMARY FOR SATURDAY, JULY 29, 2023
TEMPERATURE (DEGREES F)
MAX…….88 NORMAL…..82
MIN…….62 NORMAL…..64
MEAN……75 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+2
TOTAL DEPARTURE FOR THE MONTH…………………+66 [+2.1 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……..-7
TOTAL HEATING UNITS FOR THE SEASON……………0 DEPARTURE……..-7
TOTAL HEATING UNITS LAST SEASON TO DATE……….0 DEPARTURE………0
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY……………10 DEPARTURE……..+2
TOTAL COOLING UNITS FOR THE MONTH…………..288 DEPARTURE…….+57
TOTAL COOLING UNITS FOR THE SEASON………….416 DEPARTURE…….+46
TOTAL COOLING UNITS LAST SEASON TO DATE……..482 DEPARTURE…….-66
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)……….E35 NNE @ 08:56 P.M.
VECTOR #1 (1-Sec)……….37 NNE @ 08:56 P.M.
VECTOR #2 (1-Sec)……….35 NE @ 09:01 P.M.
DAVIS #1……………….34 NE @ 08:59 P.M.
DAVIS #2 ………………33 NNE @ 08:56 P.M.
RMY #1 (Instantaneous)…..36 NNE @ 08:56 P.M.
RMY #2 (Instantaneous)…..36 NE @ 09:13 P.M.
MERLIN…………………34 NNE
RICHARDS (C5C) (Inst)……34 @ 08:56 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 NE @ 09:00 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22 @ 09:01 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..24 @ 09:01 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 NE @ 09:01 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 NE @ 09:01 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 NE @ 09:01 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 NE @ 09:01 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………22 @ 09:01 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…………8.3 SW [200 total miles]
VECTOR #1………………….9.0
VECTOR #2………………….9.2
DAVIS #1…………………..8.8 S
DAVIS #2…………………..9.1 SSW
RMY #1…………………….8.8 SW
RMY #2…………………….9.2 SW
RICHARDS (C5C)……………..9.0
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..1.04 DEPARTURE…..+0.92
TOTAL PRECIPITATION FOR THE MONTH…………..9.58 DEPARTURE…..+6.35
TOTAL PRECIPITATION FOR THE YEAR…………..34.76 DEPARTURE…..+4.30
————————————————————–
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/+3/0.00/554/62 23 W VEC1 23 W RMY 22
7/20 82/64/73/+0/0.00/838/94 17 NNE VEC1 17 SE RMY 18
7/21 79/62/71/-2/1.99/178/20 30 NW VEC1 31 NW RMY 32 TSTM
7/22 81/64/73/0/0.00/656/74 15 W VEC1 14 W RMY 16
7/23 85/65/75/+2/0.00/805/91 21 NW VEC1 20 W RMY 21
7/24 85/67/76/+3/0.00/706/80 23 S VEC1 24 S RMY 24
7/25 85/64/75/+2/1.02/441/50 29 NNE VEC1 30 NNW RMY 29 TSTM
7/26 85/63/74/+1/0.00/817/93 23 W VEC1 23 W RMY 23
7/27 88/68/78/+5/0.43/368/42 61 WNW VEC1 63 WNW RMY 66 TSTM
7/28 88/68/78/+5/0.00/…/.. 23 SW VEC1 23 SW RMY 23
7/29 88/62/75/+2/1.04/…/.. 35 NNE VEC1 37 NNE RMY 36 TSTM
7/30 The low since midnight is 56F, the daily normal low is 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: NEW RECORD HIGH DAILY MINIMUM TEMPERATURE OF 71F;
TIES THE RECORD OF 71F SET IN 1901, 1958, 1968, AND 2013
07/27/2023: NEW RECORD PEAK WIND GUST OF 61 MPH WNW;
BEATS THE OLD RECORD OF 47 MPH ENE SET IN 1984
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JULY 30
HIGH 99F IN 1949
LOW 51F IN 1956
PRECIP 1.84 INS IN 1976
PEAK GUST 70e MPH SW 1944
RECORDS FOR JULY 31
HIGH 95F IN 1917
LOW 50F IN 1895
PRECIP 1.34 INS IN 1892
PEAK GUST 43e MPH WNW SW IN 1953, 43 SW IN 1971
TODAY’S REPORT PREPARED BY: Matt Douglas
