Sunday, September 3, 2023

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

SUNDAY, SEPTEMBER 3, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0511E
SUNSET:  1815E

WARMER AND CONSIDERABLY MORE HUMID TODAY UNDER MAINLY SUNNY SKIES…

An area of mainly mid and high level clouds moved through the
area this morning, however they moved out by the late morning
hours leaving us with abundant sunshine as we cruise through
the afternoon hours.

Temperatures have warmed into the low to mid 80s with the dew
point pushing into the mid 60s. This is definitely making it
feel like a summer day, especially compared to the fall-like
feel we had a couple of days ago.

The wind has been steady, but somewhat on the light side again
today with an average speed of around 10mph. The peak gust for
the day, which occurred after midnight, is around 21mph.

Visibility has remained steady at around 40 miles all day.

The maximum temperature so far today has been 83F, which is
6 degrees above the normal high of 77F. The minimum temperature
since midnight is 61F, which is 1 degree above the normal low
of 60F.

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PRELIMINARY STATS FOR AUGUST 2023

TEMPERATURE, Deg. F
Avg. Max. 77.5 [-2.7] Avg. Min. 61.6 [-1.0] Mean      69.6 [-1.8] 24-hour corrected mean: 68.7
Max. for month: 84F on the 12th and 21st
Min. for month: 54F on the 2nd

HEATING DEGREE DAYS
Total heating units:      1 [-010] Total for the season:     1 [-017] Total for last season:    0

COOLING DEGREE DAYS
Total cooling units:    148 [-061] Total for the season:   570 [-026] Total for last season:  836

PRECIPITATION, Inches
Total: 5.68 [+1.77] Greatest in 24 hrs: 1.50 on the 24th-25th

SNOWFALL, Inches
Total: 0.0 [0.0] Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 9.5 mph
Avg. corrected wind speed:  10.1 mph
Prevailing wind direction:   South-southwest [14%] Peak gust and direction:  39 S on the 8th, WNW on the 9th

SUNSHINE:
Campbell-Stokes card minutes: 14076 of a possible 24780, or 57%
Astronomical total minutes: 14631 of a possible 25763, or 57%

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Today’s Observations:

7 A.M.
Weather: Broken altocumulus castellanus, thin broken cirrus
Temperature: 65F; Dew Point: 62F; Relative Humidity: 90%
Wind: SW @ 8 kts
Sea-level pressure: 1015.7 mb; 29.99 in. Hg: rising, then steady
Visibility: 40 miles, thin fog
6-hr Max temp: 65F
6-hr Min temp: 61F
24-hr Precip: Trace
BHO SA 1155 E100 BKN 250 -BKN 40 157/65/62/2208/999/ THN F ALQDS/
8/081 51008 70000 10065 20061

10 A.M.
Weather: Scattered altocumulus/castellanus, thin scattered cirrus
Temperature: 77F; Dew Point: 64F; Relative Humidity: 65%
Wind: W @ 8 kts
Sea-level pressure: 1014.8 mb; 29.97 in. Hg: falling, then more slowly
Visibility: 40 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 120 SCT 250 -SCT 40 148/77/64/2708/997/ HAZY/ 8/081 56009

1 P.M.
Weather: Clear, few cumulus all quadrants, few altocumulus distant E-ESE,
few cirrus distant NE-SE-SW
Temperature: 82F; Dew Point: 63F; Relative Humidity: 52%
Wind: W @ 9 kts
Sea-level pressure: 1012.6 mb; 29.90 in. Hg: falling, then more rapidly
Visibility: 40 miles, hazy
6-hr Max temp: 83F
6-hr Min temp: 65F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 40 126/82/63/2609/990/ FEW CU ALQDS FEW AC DSNT E-ESE
FEW CI DSNT NE-SE-SW HAZY/ 8/251 58022 10083 20065

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SUMMARY FOR SATURDAY, SEPTEMBER 2, 2023

TEMPERATURE (DEGREES F)
MAX…….79   NORMAL…..77
MIN…….56   NORMAL…..60
MEAN……68   NORMAL…..69

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-1
TOTAL DEPARTURE FOR THE MONTH………………….-7 [-3.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………….2  DEPARTURE………0
TOTAL HEATING UNITS FOR THE SEASON……………3  DEPARTURE…….-17
TOTAL HEATING UNITS LAST SEASON TO DATE……….2  DEPARTURE……..+1

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……..-6
TOTAL COOLING UNITS FOR THE SEASON………….573  DEPARTURE…….-32
TOTAL COOLING UNITS LAST SEASON TO DATE……..840  DEPARTURE……-267

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)……….E25 SW   @  08:42 P.M.
VECTOR #1 (1-Sec)……….24 SW   @  08:41 P.M.
VECTOR #2 (1-Sec)……….24 SW   @  08:41 P.M.
DAVIS #1……………….24 S    @  04:01 P.M.
DAVIS #2 ………………30 S    @  04:46 P.M.
RMY #1 (Instantaneous)…..26 SW   @  08:46 P.M.
RMY #2 (Instantaneous)…..25 SSW  @  04:46 P.M.
MERLIN…………………24 SW
RICHARDS (C5C) (Inst)……24      @  03:10 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………20 SW   @  08:46 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18      @  08:43 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18      @  08:50 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 SSW  @  08:38 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 SW   @  08:44 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 SW   @  08:43 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 SW   @  08:50 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………16      @  12:02 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..11.6 WSW [279 total miles] VECTOR #1………………11.7
VECTOR #2………………12.4
DAVIS #1……………….11.4 SW
DAVIS #2……………….12.3 SW
RMY #1…………………11.6 SW
RMY #2…………………12.4 SW
RICHARDS (C5C)………….11.3

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH………….TRACE DEPARTURE…..-0.22
TOTAL PRECIPITATION FOR THE YEAR…………..40.45 DEPARTURE…..+5.62

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PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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

8/1   76/58/67/-6/0.00/763/88             24 NW  VEC1 24 NW  RMY 24
8/2   75/54/65/-8/0.00/830/96             23 SSW VEC1 22 SSW RMY 23
8/3   79/59/69/-4/0.00/725/84             32 SSW VEC1 34 SSW RMY 34
8/4   77/62/70/-3/T/172/20                29 SSW VEC1 29 SSW RMY 29
8/5   83/66/75/+2/0.00/523/61             18 NW  VEC1 16 WNW RMY 17
8/6   82/60/71/-2/0.00/839/98             20 W   VEC1 19 W   RMY 19
8/7   72/65/69/-4/0.14/034/04             29 SSE VEC1 30 SSE RMY 29
8/8   82/68/75/+3/0.47/187/22             39 S   VEC1 42 S   RMY 42
8/9   82/66/74/+2/0.00/756/89             39 WNW VEC1 38 WNW RMY 38
8/10  83/64/74/+2/0.02/254/30             28 SSW VEC1 27 SSW RMY 28
8/11  80/63/72/+0/0.07/810/96             36 W   VEC1 36 W   RMY 38
8/12  84/61/73/+1/0.00/733/87             26 SSW VEC1 26 SSW RMY 26
8/13  84/68/76/+4/0.07/629/75             26 SSW VEC1 26 SSW RMY 27 TSTM
8/14  82/63/73/+1/T/536/64                25 W   VEC1 24 W   RMY 29
8/15  70/64/67/-5/0.70/000/00             28 NE  VEC1 27 NE  RMY 28
8/16  68/64/66/-6/T/000/00                18 ESE VEC1 19 ENE RMY 18
8/17  70/62/66/-6/T/116/14                15 E   VEC1 14 E   RMY 14
8/18  79/61/70/-1/1.48/298/36             32 W   VEC1 34 W   RMY 33 TSTM
8/19  72/57/65/-6/0.00/371/45             29 W   VEC1 30 W   RMY 30
8/20  81/59/70/-1/0.00/764/93             23 W   VEC1 22 W   RMY 21
8/21  84/64/74/+3/0.85/384/47             29 NE  VEC1 30 ENE RMY 29
8/22  75/59/67/-4/0.00/792/97             29 NNE VEC1 29 NNE RMY 29
8/23  76/56/66/-5/0.00/805/99             20 NNE VEC1 20 NNE RMY 20
8/24  78/58/68/-3/0.02/568/70             24 S   VEC1 24 S   RMY 23
8/25  69/58/64/-6/1.48/000/00             35 S   VEC1 36 S   RMY 37
8/26  83/68/76/+6/0.00/500/62             23 SSW VEC1 22 SSW RMY 22
8/27  75/61/68/-2/0.00/731/91             20 NE  VEC1 20 NE  RMY 20
8/28  73/61/67/-3/0.00/416/52             17 SSE VEC1 17 SE  RMY 17
8/29  76/61/69/-1/0.11/096/12             17 ENE VEC1 16 ENE RMY 15
8/30  79/62/71/+2/0.27/215/27             29 WNW VEC1 28 WNW RMY 29
8/31  73/57/65/-4/0.00/784/99             30 NNW VEC1 30 NNW RMY 30

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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/…/..             23 SSW VEC1 22 SSW RMY 21
9/2   79/56/68/-1/0.00/…/..             25 SW  VEC1 24 SW  RMY 26

9/3 The low since midnight is 61F, the daily normal low is 60F

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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR SEPTEMBER 3
HIGH 95F IN 1929
LOW 43F IN 1893
PRECIP 3.82 INCHES IN 1972 (TROPICAL STORM CARRIE)
PEAK GUST 58 MPH NNE IN 1972 (TROPICAL STORM CARRIE)

RECORDS FOR SEPTEMBER 4
HIGH 90F IN 1953, 1973
LOW 46F IN 1987
PRECIP 3.22 INCHES IN 1922
PEAK GUST 47 MPH SE IN 1966

TODAY’S REPORT PREPARED BY: Matt Douglas