Saturday, September 30, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, SEPTEMBER 30, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0540E
SUNSET: 1728E
RAIN MOVES OUT EARLY TO OVERCAST CONDITIONS AND BELOW AVERAGE
TEMPERATURES TODAY AT BLUE HILL…
Today has been much like yesterday, but without the daytime rain
showers. We did have some rain during the early morning hours, but
the remainder of the day has been overcast with light fog in the area.
We started off a bit breezy this morning, but in the afternoon the
wind has decreased a bit. It’s still really nice outside, despite the
lack of sunshine.
Temperatures are still well below the average of 67F, as we have not
hit 60F on the hill since Thursday afternoon. The low temperatures have
been around average though, and the dew points have hovered around the
mid 50s throughout the day.
The wind has been pretty steady, with a breeze mostly out of the NNE
today with an average of about 11 mph. By the afternoon, the wind
began to shift to the NE and slowed down quite a bit. Our peak gust
so far has been about 25 mph which occurred overnight.
Thin fog and overcast skies impacted our visibility today, though it
has been marginally better than yesterday. Still though, we’ve only
been in the 10-20 mile range.
The maximum temperature so far today has been 58F, which is
9 degrees below the normal high of 67F. The minimum temperature
since midnight is 53F, which is 3 degrees above the normal low
of 50F.
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Today’s Observations:
7 A.M.
Weather: Broken stratocumulus, overcast stratus, few lower stratus
fractus
Temperature: 54F; Dew Point: 54F; Relative Humidity: 100%
Wind: NNE @ 11 kts
Sea-level pressure: 1022.7 mb; 30.20 in. Hg: rising rapidly
Visibility: 10 miles, thin fog
6-hr Max temp: 54F
6-hr Min temp: 53F
24-hr Precip: 0.60 inches
BHO SA 1155 E25 BKN 95 OVC 10 227/54/54/0211/020/ FEW LWR STFRA ALQDS
THN F ALQDS/ 8/62/ 53010 70060 10054 20053
10 A.M.
Weather: Scattered stratocumulus, overcast stratus, few lower stratus
fractus
Temperature: 57F; Dew Point: 55F; Relative Humidity: 93%
Wind: NNE @ 10 kts
Sea-level pressure: 1023.4 mb; 30.22 in. Hg: rising, then more slowly
Visibility: 20 miles, thin fog
3-hr Precip: 0.00 inches
BHO SA 1455 E23 SCT 95 OVC 20 234/57/55/0210/022/ FEW LWR STFRA ALQDS
THN F ALQDS/ 8/61/ 51007
1 P.M.
Weather: Overcast stratus
Temperature: 58F; Dew Point: 54F; Relative Humidity: 86%
Wind: NE @ 6 kts, wind light
Sea-level pressure: 1022.7 mb; 30.20 in. Hg: falling steady
Visibility: 10 miles, thin fog
6-hr Max temp: 65F
6-hr Min temp: 53F
6-hr Precip: 0.00 inches
BHO SA 1755 E95 OVC 10 227/58/54/0406/020/ THN F ALQDS WND LGT/
8/6// 57007 10058 20054
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SUMMARY FOR FRIDAY, SEPTEMBER 29, 2023
TEMPERATURE (DEGREES F)
MAX…….57 NORMAL…..68
MIN…….52 NORMAL…..51
MEAN……55 NORMAL…..59
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-4
TOTAL DEPARTURE FOR THE MONTH…………………+49 [+1.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………10 DEPARTURE……..+3
TOTAL HEATING UNITS FOR THE MONTH……………88 DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE SEASON…………..79 DEPARTURE…….-22
TOTAL HEATING UNITS LAST SEASON TO DATE………86 DEPARTURE……..+3
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)……….E28 NNE @ 04:42 P.M.
VECTOR #1 (1-Sec)……….25 NNE @ 04:13 P.M.
VECTOR #2 (1-Sec)……….29 NE @ 04:42 P.M.
DAVIS #1……………….24 NE @ 04:13 P.M.
DAVIS #2 ………………25 NNE @ 04:43 P.M.
RMY #1 (Instantaneous)…..26 NNE @ 04:42 P.M.
RMY #2 (Instantaneous)…..28 NE @ 04:42 P.M.
MERLIN…………………25 NNE
RICHARDS (C5C) (Inst)……25 @ 04:42 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 NNE @ 04:13 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17 @ 04:04 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 @ 04:13 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 NNE @ 04:04 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 NE @ 04:13 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 NNE @ 04:00 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 NE @ 04:13 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………17 @ 04:00 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………9.9 NNE [214 total miles]
VECTOR #1……………….9.7
VECTOR #2………………10.5
DAVIS #1……………….10.2 NE
DAVIS #2……………….10.4 ENE
RMY #1………………….9.7 NE
RMY #2…………………10.3 NE
RICHARDS (C5C)………….10.1
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.60 DEPARTURE…..+0.45
TOTAL PRECIPITATION FOR THE MONTH…………..6.77 DEPARTURE…..+2.87
TOTAL PRECIPITATION FOR THE YEAR…………..47.22 DEPARTURE…..+8.71
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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 57/52/55/-4/…/…/.. 28 NNE VEC1 25 NNE RMY 26
9/30 The low since midnight is 53F, the daily normal low is 50F
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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 30
HIGH 84F IN 1986
LOW 31F IN 1992
PRECIP 2.44 INCHES IN 2015
PEAK GUST 71 MPH S IN 2020
RECORDS FOR OCTOBER 1
HIGH 85F IN 1927
LOW 30F IN 1992
PRECIP 1.63 INCHES IN 2014
PEAK GUST 68e MPH SSE IN 1977
TODAY’S REPORT PREPARED BY: Amanda Joly
