Saturday, August 5, 2023

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

SATURDAY, AUGUST 5, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0441E
SUNSET:  1859E

VISIBILITY LIMITED DUE TO MORNING FOG AND AFTERNOON HAZE…

With humid conditions early in the morning, a thin fog
layer was observed during 7 A.M. observation. The morning
fog dissipated but a thin layer of smoke and haze remained.
This combination reduced visibility down to approximately
25 miles all day. Wind from the west was light and variable.
All and all conditions were sunny and mild with cloud cover
decreasing throughout the day.

Yesterday the temperature was below normal with a high of 77F.
This is 5 degrees below the daily normal temperature of 82F.
The temperature today has been seasonable with a high so far
of 82F, matching the daily normal high of 82F. The minimum
temperature so far today is 66F, which is 2 degrees above
the normal low of 64F.

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PRELIMINARY STATS FOR JULY 2023

TEMPERATURE, Deg. F
Avg. Max. 82.7 [+1.0] Avg. Min. 65.7 [+1.9] Mean      74.2 [+1.5] 24-hour corrected mean: 73.5
Max. for month: 92F on the 6th
Min. for month: 56F on the 30th

HEATING DEGREE DAYS
Total heating units:      0 [-007] Total for the season:     0 [-007] Total for last season:    0

COOLING DEGREE DAYS
Total cooling units:    294 [+046] Total for the season:   422 [+035] Total for last season:  507

PRECIPITATION, Inches
Total: 9.59 [+6.12] Greatest in 24 hrs: 2.56 on the 16th

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

WIND, mph
Avg. uncorrected wind speed: 8.6 mph
Avg. corrected wind speed:   9.3 mph
Prevailing wind direction:   South-southwest [23%] Peak gust and direction:  61 WNW on the 27th

SUNSHINE:
Campbell-Stokes card minutes: 15312 of a possible 26682, or 57%
Astronomical total minutes: 15913 of a possible 27749, or 57%

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Today’s Observations:

7 A.M.
Weather: Broken stratocumulus, broken cirrostratus, crepuscular
rays ENE-E
Temperature: 68F; Dew Point: 67F; Relative Humidity: 98%
Wind: W @ 6 kts, Wind Light
Sea-level pressure: 1013.8 mb; 29.94 in. Hg: steadily rising
Visibility: 25 miles, thin fog slowly dissipating
6-hr Max temp: 68F
6-hr Min temp: 66F
24-hr Precip: 0.00 ins.
BHO SA 1155 E10 BKN 250 BKN 25 138/68/67/2806/994/ THN F SLWLY
DSPTNG CREPUSCULAR RAYS ENE-E WND LGT/ 8/505 52011 10068 20066

10 A.M.
Weather: Scattered cumulus, broken stratocumulus, thin broken
cirrostratus, thin smoke layer aloft
Temperature: 77F; Dew Point: 64F; Relative Humidity: 87%
Wind: NW @ 4 kts, wind light and variable
Sea-level pressure: 1014.7 mb; 29.96 in. Hg: steadily rising
Visibility: 25 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 30 SCT 38 BKN 250 -BKN 25 147/77/64/3204/996/
THN K LYR ALF HAZY WND L/V/ 8/805 52009

1 P.M.
Weather: Scattered cumulus, scattered stratocumulus, thin smoke
layer aloft
Temperature: 82F; Dew Point: 61F; Relative Humidity: 50%
Wind: WNW @ 8 kts
Sea-level pressure: 1013.9mb; 29.94 in. Hg: falling steadily
Visibility: 25 miles, hazy
6-hr Max temp: 82F
6-hr Min temp: 68F
6-hr Precip: 0.00 inches
BHO SA 1755 45 SCT 55 SCT 25 139/82/61/3008/994/ THN K LYR ALF
HAZY/ 8/800 57008 10082 20068

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SUMMARY FOR FRIDAY, AUGUST 4, 2023

TEMPERATURE (DEGREES F)
MAX…….77   NORMAL…..82
MIN…….62   NORMAL…..64
MEAN……70   NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-3
TOTAL DEPARTURE FOR THE MONTH…………………-21 [-5.1 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……..-1
TOTAL HEATING UNITS FOR THE SEASON……………0  DEPARTURE……..-8
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE………0

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….5  DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE MONTH……………11  DEPARTURE…….-21
TOTAL COOLING UNITS FOR THE SEASON………….433  DEPARTURE…….+14
TOTAL COOLING UNITS LAST SEASON TO DATE……..563  DEPARTURE……-130

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)……….E29 SSW   @  08:18 P.M.
VECTOR #1 (1-Sec)……….29 SSW   @  08:17 P.M.
VECTOR #2 (1-Sec)……….30 SSW   @  04:41 A.M.
DAVIS #1……………….33 S     @  08:17 P.M.
DAVIS #2 ………………32 S     @  06:47 A.M.
RMY #1 (Instantaneous)…..29 SSW   @  04:29 A.M.
RMY #2 (Instantaneous)…..32 SSW   @  04:41 A.M.
MERLIN…………………27 SSW
RICHARDS (C5C) (Inst)……27       @  08:17 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 SSW @  08:18 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20     @  08:18 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22     @  08:18 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 S   @  08:18 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 S   @  08:18 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 SSW @  01:47 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 SSW @  08:18 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………19     @  08:18 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………..13.0 SSW [313 total miles] VECTOR #1…………………13.1
VECTOR #2…………………14.1
DAVIS #1………………….12.6 SSW
DAVIS #2………………….14.3 SSW
RMY #1……………………12.8 SSW
RMY #2……………………14.3 SSW
RICHARDS (C5C)…………….12.5

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..0.00 DEPARTURE…..-0.52
TOTAL PRECIPITATION FOR THE YEAR…………..34.77 DEPARTURE…..+3.55

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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/+5/0.00/840/96             23 SW   VEC1 23 SW  RMY 23
7/29  88/62/75/+2/1.04/279/32             35 NNE  VEC1 37 NNE RMY 36 TSTM
7/30  75/56/66/-7/0.00/827/95             24 N    VEC1 24 NNW RMY 25
7/31  80/59/70/-3/0.01/721/83             35 WNW  VEC1 34 WNW RMY 35

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

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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/…/..             24 NW  VEC1 24 NW  RMY 24
8/2   75/54/65/-8/0.00/…/..             23 SSW VEC1 22 SSW RMY 23
8/3   79/59/69/-4/…/…/..              32 SSW VEC1 34 SSW RMY 34
8/4   77/62/70/-3/0.00/…/..             29 SSW VEC1 29 SSW RMY 29

8/5 The low since midnight is 66F, the daily normal low is 64F

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

RECORDS FOR AUGUST 5
HIGH 98F IN 1955
LOW 48F IN 1929,1972
PRECIP 2.97 INCHES IN 1893
PEAK GUST 60e MPH SW 1977

RECORDS FOR AUGUST 6
HIGH 95F IN 1931, 2022
LOW 48F IN 1934
PRECIP 1.47 INCHES IN 1995
PEAK GUST 44e MPH SSW IN 1940

TODAY’S REPORT PREPARED BY: Kaitlin Geagan