Wednesday, October 4, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, OCTOBER 4, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0544E
SUNSET: 1721E
ANOTHER DAY OF SUNSHINE AND UNSEASONABLY WARM TEMPERATURES…
Sunshine has continued to rule today, with clear skies aside
from a few distant cirrus in the late morning.
As we remain under an upper level ridge, temperatures have
risen well-above average this afternoon, reaching yet again into the
upper 70s and low 80s. This is 10+ degrees above the average high
for this time of year. The dew point has also risen slightly, beginning
in the low 60s this morning and reaching the mid-60s by the afternoon,
resulting in a somewhat sticky feel more resemblant of summer.
The wind has been light today, much to the delight of the bees flying
around the top of the observatory tower. The average speed so far is only
around 7mph, with a measly peak gust of only 14mph just after 4:30am.
The prevailing direction thus far is east-northeast.
Despite the clear skies, visibility has been stubbornly decreasing as
the day has gone on thanks to increasing haziness. The day began with a
visibility of 40 miles, but by early afternoon that had dropped down to
only 25 miles.
The maximum temperature so far today has been 81F, which is
15 degrees above the normal high of 66F. The minimum temperature
since midnight is 64F, which is 15 degrees above the normal low
of 49F.
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PRELIMINARY STATS FOR SEPTEMBER 2023
TEMPERATURE, Deg. F
Avg. Max. 72.5 [-0.2]
Avg. Min. 58.4 [+2.8]
Mean 65.5 [+1.3]
24-hour corrected mean: 64.6
Max. for month: 92F on the 7th
Min. for month: 46F on the 27th
HEATING DEGREE DAYS
Total heating units: 98 [-002]
Total for the season: 99 [-019]
Total for last season: 99
COOLING DEGREE DAYS
Total cooling units: 119 [+045]
Total for the season: 689 [+019]
Total for last season: 884
PRECIPITATION, Inches
Total: 6.77 [+2.71]
Greatest in 24 hrs: 1.92 on the 13th
SNOWFALL, Inches
Total: 0.0 [0.0]
Greatest in 24 hrs: N/A
WIND, mph
Avg. uncorrected wind speed: 9.6 mph
Avg. corrected wind speed: 10.2 mph
Prevailing wind direction: East-northeast [16%]
Peak gust and direction: 44 WNW on the 17th
SUNSHINE:
Campbell-Stokes card minutes: 11454 of a possible 22582, or 53%
Astronomical total minutes: 11917 of a possible 22465, or 53%
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Today’s Observations:
7 A.M.
Weather: Clear
Temperature: 68F; Dew Point: 61F; Relative Humidity: 78%
Wind: NE @ 6 kts, wind light
Sea-level pressure: 1023.2 mb; 30.22 in. Hg: rising, then more rapidly
Visibility: 40 miles, hazy
6-hr Max temp: 68F
6-hr Min temp: 64F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 40 232/68/61/0406/022/ HAZY WND LGT/ 8/000 53017 10068 20064
10 A.M.
Weather: Clear, few cirrus distant NNE-NE
Temperature: 78F; Dew Point: 66F; Relative Humidity: 67%
Wind: E @ 3 kts, wind light and variable
Sea-level pressure: 1024.3 mb; 30.25 in. Hg: rising, then steady
Visibility: 30 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 30 243/78/66/0903/025/ FEW CI DSNT NNE-NE HAZY WND L/V/ 8/001
51011
1 P.M.
Weather: Clear
Temperature: 79F; Dew Point: 66F; Relative Humidity: 65%
Wind: ENE @ 7 kts
Sea-level pressure: 1023.5 mb; 30.22 in. Hg: falling, then more rapidly
Visibility: 25 miles, hazy
6-hr Max temp: 81F
6-hr Min temp: 68F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 25 235/79/66/0607/022/ HAZY/ 8/000 58008 10081 20068
————————————————————–
SUMMARY FOR TUESDAY, OCTOBER 3, 2023
TEMPERATURE (DEGREES F)
MAX…….81 NORMAL…..66
MIN…….54 NORMAL…..49
MEAN……68 NORMAL…..57
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+11
TOTAL DEPARTURE FOR THE MONTH…………………+16 [+5.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-8
TOTAL HEATING UNITS FOR THE MONTH…………….9 DEPARTURE…….-15
TOTAL HEATING UNITS FOR THE SEASON………….108 DEPARTURE…….-33
TOTAL HEATING UNITS LAST SEASON TO DATE……..139 DEPARTURE…….-31
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….3 DEPARTURE……..+2
TOTAL COOLING UNITS FOR THE MONTH…………….3 DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE SEASON………….692 DEPARTURE…….+20
TOTAL COOLING UNITS LAST SEASON TO DATE……..884 DEPARTURE……-192
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 WSW @ 07:09 A.M.
VECTOR #1 (1-Sec)……….18 WSW @ 05:51 A.M.
VECTOR #2 (1-Sec)……….20 WSW @ 07:07 A.M.
DAVIS #1……………….18 WSW @ 03:35 A.M.
DAVIS #2 ………………19 WSW @ 07:07 A.M.
RMY #1 (Instantaneous)…..18 WSW @ 05:51 A.M.
RMY #2 (Instantaneous)…..20 WSW @ 07:07 A.M.
MERLIN…………………17 W
RICHARDS (C5C) (Inst)……18 @ 06:51 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 WSW @ 03:32 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14 @ 03:37 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 @ 03:36 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 WSW @ 03:37 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………14 W @ 03:36 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 WSW @ 03:37 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 W @ 03:39 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14 @ 03:37 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..8.5 WSW [204 total miles]
VECTOR #1………………8.5
VECTOR #2………………8.7
DAVIS #1……………….9.3 W
DAVIS #2……………….8.9 W
RMY #1…………………8.8 W
RMY #2…………………9.1 W
RICHARDS (C5C)………….9.3
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.16
TOTAL PRECIPITATION FOR THE MONTH…………..0.00 DEPARTURE…..-0.50
TOTAL PRECIPITATION FOR THE YEAR…………..47.22 DEPARTURE…..+8.05
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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/216/30 36 NE VEC1 37 NE RMY 39
9/27 63/46/55/-5/0.00/652/91 18 ENE VEC1 18 E RMY 18
9/28 65/50/58/-1/0.00/520/73 18 E VEC1 18 E RMY 19
9/29 57/52/55/-4/0.46/000/00 28 NNE VEC1 25 NNE RMY 26
9/30 58/52/55/-4/0.14/000/00 23 N VEC1 23 NE RMY 25
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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
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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
10/1 68/50/59/+1/0.00/…/.. 20 NNE VEC1 20 NNE RMY 19
10/2 68/55/62/+4/0.00/…/.. 24 NE VEC1 23 NE RMY 24
10/3 81/54/68/+11/0.00/…/.. 18 WSW VEC1 18 WSW RMY 18
10/4 The low since midnight is 64F, the daily normal low is 49F
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR OCTOBER 4
HIGH 84F IN 2007
LOW 28F IN 1888
PRECIP 1.87 INCHES IN 2011
PEAK GUST 59 MPH SSW IN 1990
RECORDS FOR OCTOBER 5
HIGH 86F IN 2007
LOW 29F IN 1965
PRECIP 3.17 INCHES IN 1962
PEAK GUST 64e MPH S IN 1979
TODAY’S REPORT PREPARED BY: Joshua Polen/Matt Douglas
