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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, SEPTEMBER 29, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0539E
SUNSET: 1730E
RAINY, OVERCAST, AND BELOW AVERAGE TEMPERATURES TODAY AT BLUE HILL…
Today has been rather raw and chilly overall. Rain moved into the
area early this morning and was mostly light with times of moderate
precipitation throughout the late morning and afternoon hours. It’s
definitely been the kind of day to stay indoors, read a book, or
perhaps read over the climate reports on bluehillobservatory.org.
Temperatures have remained on the cooler side for most of the day,
mostly due to the rain and cloud cover. Our temperatures overnight
were slightly above average, but our high temperature has remained
well below average for the day.
The wind has been mostly out of the northeast today with an average
of about 9 mph. Our peak gust so far has been about 23 mph which
occurred just after 1pm when the wind began to shift in the ENE
direction.
Visibility has been poor for most of the day. We started with about
12 miles early this morning and with the rain came foggy conditions
by late morning. This caused visibility to further deteriorate, leaving
us with only about 5 miles of ‘viewing ability’ by the last observation.
The maximum temperature so far today has been 57F, which is
11 degrees below the normal high of 68F. The minimum temperature
since midnight is 53F, which is 2 degrees above the normal low
of 51F.
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Today’s Observations:
7 A.M.
Weather: Broken stratocumulus, overcast stratus, few lower stratus
fractus ESE-S-SSW
Temperature: 55F; Dew Point: 55F; Relative Humidity: 100%
Wind: NE @ 8 kts
Sea-level pressure: 1025.7 mb; 30.29 in. Hg: steady, then rising
Visibility: 12 miles, thin fog, thin smoke layer along horizon
SW-W-N
6-hr Max temp: 55F
6-hr Min temp: 53F
24-hr Precip: 0.00 inches
BHO SA 1155 E30 BKN 95 OVC 12 257/55/55/0408/029/ FEW LWR STFRA
ESE-S-SSW THN F ALQDS THN K LYR ALG HRZN SW-W-N/ 8/62/ 53004
10055 20053
10 A.M.
Weather: Overcast stratus, light rain
Temperature: 56F; Dew Point: 56F; Relative Humidity: 100%
Wind: NE @ 6 kts, wind light
Sea-level pressure: 1026.3 mb; 30.31 in. Hg: rising, then falling
Visibility: 8 miles, thin fog
3-hr Precip: 0.04 inches
BHO SA 1455 E8 OVC 8R- 263/56/56/0306/031/ THN F ALQDS WND LGT/ 8/7//
50006 6004/
1 P.M.
Weather: Overcast stratus, rain
Temperature: 56F; Dew Point: 56F; Relative Humidity: 100%
Wind: ENE @ 8G19 kts
Sea-level pressure: 1027.6 mb; 30.35 in. Hg: falling steady
Visibility: 5 miles, fog
6-hr Max temp: 65F
6-hr Min temp: 53F
6-hr Precip: 0.12 inches
BHO SA 1755 E6 OVC 5RF 246/56/56/0608G19/026/ 8/7// 57017 6012/
10057 20053
————————————————————–
SUMMARY FOR THURSDAY, SEPTEMBER 28, 2023
TEMPERATURE (DEGREES F)
MAX…….65 NORMAL…..68
MIN…….50 NORMAL…..51
MEAN……58 NORMAL…..59
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-1
TOTAL DEPARTURE FOR THE MONTH…………………+53 [+1.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….7 DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH……………78 DEPARTURE……..-8
TOTAL HEATING UNITS FOR THE SEASON…………..79 DEPARTURE…….-25
TOTAL HEATING UNITS LAST SEASON TO DATE………77 DEPARTURE……..+2
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH…………..119 DEPARTURE…….+46
TOTAL COOLING UNITS FOR THE SEASON………….689 DEPARTURE…….+20
TOTAL COOLING UNITS LAST SEASON TO DATE……..884 DEPARTURE……-195
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)……….E18 E @ 06:52 P.M.
VECTOR #1 (1-Sec)……….19 E @ 06:54 P.M.
VECTOR #2 (1-Sec)……….20 E @ 06:50 P.M.
DAVIS #1……………….19 E @ 06:51 P.M.
DAVIS #2 ………………19 E @ 07:19 P.M.
RMY #1 (Instantaneous)…..19 E @ 06:52 P.M.
RMY #2 (Instantaneous)…..19 E @ 06:52 P.M.
MERLIN…………………17 E
RICHARDS (C5C) (Inst)……17 @ 06:50 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 E @ 06:51 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..13 @ 06:43 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 @ 06:51 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 E @ 06:47 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 E @ 06:51 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 E @ 06:43 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 E @ 06:50 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14 @ 06:44 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………8.9 ENE [214 total miles]
VECTOR #1……………….8.8
VECTOR #2……………….9.7
DAVIS #1………………..9.6 E
DAVIS #2………………..9.6 E
RMY #1………………….9.1 ENE
RMY #2………………….9.5 ENE
RICHARDS (C5C)…………..9.4
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH…………..6.17 DEPARTURE…..+2.42
TOTAL PRECIPITATION FOR THE YEAR…………..46.62 DEPARTURE…..+8.26
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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
9/1 73/52/63/-6/0.00/774/98 23 SSW VEC1 22 SSW RMY 21
9/2 79/56/68/-1/0.00/708/90 25 SW VEC1 24 SW RMY 26
9/3 85/61/73/+5/T/674/86 21 SW VEC1 21 SW RMY 21
9/4 85/68/77/+9/0.00/719/92 17 NW VEC1 16 NW RMY 16
9/5 86/68/77/+9/0.00/647/83 16 NNE VEC1 16 ENE RMY 16
9/6 89/70/80/+12/0.00/722/93 17 WSW VEC1 17 SSW RMY 18
9/7 92/72/82/+15/0.00/726/94 20 SSW VEC1 21 SSW RMY 21
9/8 86/70/78/+11/0.00/293/38 30 SSW VEC1 31 SSW RMY 32 TSTM
9/9 86/68/77/+10/0.49/291/38 30 S VEC1 31 S RMY 29 TSTM
9/10 78/67/73/+7/0.25/008/01 17 NE VEC1 17 NE RMY 15 TSTM
9/11 74/67/71/+5/0.64/023/03 15 E VEC1 15 E RMY 14 TSTM
9/12 79/65/72/+6/T/250/33 18 E VEC1 17 E RMY 18
9/13 76/64/70/+5/1.92/242/32 35 SSW VEC1 35 SSW RMY 36 TSTM
9/14 75/57/66/+1/0.00/670/89 24 NW VEC1 24 NW RMY 24
9/15 66/53/60/-5/0.00/465/62 36 N VEC1 35 N RMY 35
9/16 68/54/61/-3/0.21/022/03 44 WNW VEC1 44 WNW RMY 47
9/17 76/53/65/+1/0.00/685/92 26 WNW VEC1 25 WNW RMY 24
9/18 64/60/62/-1/1.56/000/00 33 WNW VEC1 33 WNW RMY 35 TSTM
9/19 70/56/63/0/0.00/665/90 35 WNW VEC1 37 WNW RMY 36
9/20 72/53/63/0/0.00/714/97 21 WNW VEC1 21 WNW RMY 22
9/21 71/52/62/0/0.00/661/90 17 NNW VEC1 17 NNW RMY 17
9/22 68/54/61/-1/0.00/570/78 23 E VEC1 21 E RMY 22
9/23 58/54/56/-6/0.24/000/00 30 NE VEC1 30 NE RMY 27
9/24 60/56/58/-3/0.73/000/00 30 ENE VEC1 30 ENE RMY 29
9/25 60/55/58/-3/0.13/000/00 38 ENE VEC1 40 ENE RMY 41
9/26 57/47/52/-8/T/209/29 36 NE VEC1 37 NE RMY 39
9/27 63/46/55/-5/0.00/654/91 18 ENE VEC1 18 E RMY 18
9/28 65/50/58/-1/0.00/…/.. 18 E VEC1 18 E RMY 19
9/29 The low since midnight is 53F, the daily normal low is 51F
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SEPTEMBER DAILY RECORDS
09/07/2023: NEW RECORD HIGH DAILY MINIMUM TEMPERATURE OF 72F;
BEATS THE RECORD OF 70F SET IN 1999
09/07/2023: RECORD HIGH TEMPERATURE OF 92F;
TIES THE RECORD OF 92F SET IN 2007 AND 2015
09/08/2023: RECORD HIGH DAILY MINIMUM TEMPERATURE OF 70F;
TIES THE RECORD OF 70F SET IN 2015
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR SEPTEMBER 29
HIGH 85F IN 1952
LOW 28F IN 1914 (SEPTEMBER MINIMUM RECORD)
PRECIP 2.61 INCHES IN 1907
PEAK GUST 62 MPH S IN 2005
RECORDS FOR SEPTEMBER 30
HIGH 84F IN 1986
LOW 31F IN 1992
PRECIP 2.44 INCHES IN 2015
PEAK GUST 71 MPH S IN 2020
TODAY’S REPORT PREPARED BY: Amanda Joly
