Tuesday, August 1, 2023

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

TUESDAY, AUGUST 1, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0437E
SUNSET:  1904E

SPECTACULAR SUMMER WEATHER CONTINUES WITH PLEASANT TEMPERATURES
AND DRY AIR…

It doesn’t get much better than this as we open the month of
August! Abundant sunshine this morning has become more of a
mix of sun and clouds this afternoon as cumulus clouds have
popped up dotting the sky. The temperature has only reached
the mid 70s this afternoon, which is below normal for the
date.

The best part of this weather is the relatively low dew
points which have dropped into the low 50s this afternoon.
This is very refreshing air for this time of year, perfect
for any and all outdoor activities.

The wind has been mainly light, but does have brief periods
where it gets a bit gusty as some momentum is generated from
the mixing of the atmosphere. The average speed for the day
so far is around 8mph. A gust to around 23mph occurred just
after 11:30am.

Visibility has been excellent today (and certainly excellent
for this time of year), ranging between 70-80 miles all day!

The maximum temperature so far today is 76F, this is 6 degrees
below the normal high of 82F. The minimum temperature today is
58F, which is 6 degrees below the normal low of 64F.

The monthly rainfall total of 9.59″ is now ranked 5th most for
the month of July. Here is the list of rankings per our Chief
Scientist Mike Iacono.

BHO Highest July Precipitation, inches (1886-2023):

1) 11.67 in 1938
2) 11.59 in 2021
3) 10.66 in 1988
4) 10.43 in 1921
5)  9.59 in 2023
6)  9.52 in 1915
7)  8.47 in 1889
8)  7.62 in 2009

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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: Clear, few altocumulus/castellanus distant ENE-SE-SW,
few cirrus distant ENE-SE-SW
Temperature: 64F; Dew Point: 54F; Relative Humidity: 71%
Wind: NNW @ 7 kts
Sea-level pressure: 1020.1 mb; 30.12 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 64F
6-hr Min temp: 58F
24-hr Precip: 0.01 inches
BHO SA 1155 CLR 70 201/64/54/3407/012/ FEW AC/ACC DSNT ENE-SE-SW
FEW CI DSNT ENE-SE-SW/ 8/081 51019 70001 10064 20058

10 A.M.
Weather: Clear, few cumulus all quadrants, few cirrus distant E-SE-SW
Temperature: 70F; Dew Point: 51F; Relative Humidity: 50%
Wind: NNW @ 6 kts, wind light
Sea-level pressure: 1020.4 mb; 30.13 in. Hg: rising, then steady
Visibility: 80 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 80 204/70/51/3406/013/ FEW CU ALQDS FEW CI DSNT E-SE-SW
WND LGT/ 8/201 51003

1 P.M.
Weather: Scattered cumulus
Temperature: 73F; Dew Point: 52F; Relative Humidity: 47%
Wind: NNW @ 7 kts
Sea-level pressure: 1019.9mb; 30.12 in. Hg: falling, then more rapidly
Visibility: 80 miles
6-hr Max temp: 76F
6-hr Min temp: 64F
6-hr Precip: 0.00 inches
BHO SA 1755 60 SCT 80 199/73/52/3307/012/ 8/200 58005 10076 20064

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SUMMARY FOR MONDAY, JULY 31, 2023

TEMPERATURE (DEGREES F)
MAX…….80   NORMAL…..82
MIN…….59   NORMAL…..64
MEAN……70   NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-3
TOTAL DEPARTURE FOR THE MONTH…………………+56 [+1.5 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……..-7
TOTAL HEATING UNITS FOR THE SEASON……………0  DEPARTURE……..-7
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…………..294  DEPARTURE…….+46
TOTAL COOLING UNITS FOR THE SEASON………….422  DEPARTURE…….+35
TOTAL COOLING UNITS LAST SEASON TO DATE……..507  DEPARTURE…….-85

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)……….E35 WNW   @  06:14 P.M.
VECTOR #1 (1-Sec)……….34 WNW   @  06:14 P.M.
VECTOR #2 (1-Sec)……….38 NW    @  06:14 P.M.
DAVIS #1……………….33 WNW   @  06:14 P.M.
DAVIS #2 ………………35 NW    @  06:14 P.M.
RMY #1 (Instantaneous)…..35 WNW   @  06:14 P.M.
RMY #2 (Instantaneous)…..39 NW    @  06:14 P.M.
MERLIN…………………31 W
RICHARDS (C5C) (Inst)……36       @  06:14 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………25 WNW @  06:14 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22     @  06:14 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..26     @  06:14 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………24 WNW @  06:14 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 NW  @  06:14 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 WNW @  06:14 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..25 NW  @  06:14 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………23     @  06:14 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…………8.0 W [191 total miles] VECTOR #1………………….8.5
VECTOR #2………………….8.8
DAVIS #1…………………..8.7 WNW
DAVIS #2…………………..8.5 NW
RMY #1…………………….8.2 WNW
RMY #2…………………….8.7 WNW
RICHARDS (C5C)……………..8.8

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.01 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..9.59 DEPARTURE…..+6.12
TOTAL PRECIPITATION FOR THE YEAR…………..34.77 DEPARTURE…..+4.07

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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

8/1 The low since midnight is 58F, the daily normal low is 64F

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

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

RECORDS FOR AUGUST 1
HIGH 97F IN 1917
LOW 49F IN 1891
PRECIP 3.61 INCHES IN 1927
PEAK GUST 41 MPH NNW IN 1985

RECORDS FOR AUGUST 2
HIGH 101F IN 1975 [STATION RECORD MAXIMUM – Tied with 8/10/1949] LOW 50F IN 1929, 1947
PRECIP 1.94 INCHES IN 1946
PEAK GUST 50 MPH SW IN 2006

TODAY’S REPORT PREPARED BY: Matt Douglas