Thursday, July 20, 2023

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

THURSDAY, JULY 20, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0425E
SUNSET:  1916E

ABUNDANT SUNSHINE AND WARM, BUT A BIT LOWER HUMIDITY…

Sunshine has been the theme today with only a few clouds of
varying types throughout the day. The temperature rose into
the low 80s today, but with the dew point generally around
60F, as opposed to around 70F, it feels better today than it
has in quite some time.

The wind has been generally light onshore today. The average
speed for the day so far is around 8mph. The peak gust so far
is around 17mph, occurring just after 5am!

Visibility has been rather good today, with views of 50-60
miles as the smoke and haze of the past few days have finally
moved out of the area.

The maximum temperature so far today is 82F, this is equal to
the normal high of 82F. The minimum temperature today is 64F,
this is equal to the normal low of 64F.

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Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus castellanus distant NNW, few
cirrus distant E-SSW
Temperature: 71F; Dew Point: 59F; Relative Humidity: 65%
Wind: NE @ 7 kts
Sea-level pressure: 1017.2 mb; 30.04 in. Hg: falling, then rising
Visibility: 50 miles
6-hr Max temp: 71F
6-hr Min temp: 64F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 50 172/71/59/0407/004/ FEW ACC DSNT NNW
FEW CI DSNT E-SSW/ 8/081 51005 10071 20064

10 A.M.
Weather: Clear, few cumulus distant WNW-NNW, few cirrus distant E-SSE
Temperature: 77F; Dew Point: 59F; Relative Humidity: 54%
Wind: E @ 7 kts
Sea-level pressure: 1017.3 mb; 30.04 in. Hg: rising, then falling
Visibility: 60 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 60 173/77/59/0907/004/ FEW CU DSNT WNW-NNW
FEW CI DSNT E-SSE/ 8/201 50001

1 P.M.
Weather: Clear, few cumulus all quadrants
Temperature: 81F; Dew Point: 62F; Relative Humidity: 53%
Wind: E @ 3 kts, wind light and variable
Sea-level pressure: 1016.0mb; 30.00 in. Hg: falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 82F
6-hr Min temp: 71F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 60 160/81/62/0803/000/ FEW CU ALQDS WND L/V/
8/200 58013 10082 20071

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SUMMARY FOR WEDNESDAY, JULY 19, 2023

TEMPERATURE (DEGREES F)
MAX…….83   NORMAL…..82
MIN…….68   NORMAL…..64
MEAN……76   NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+3
TOTAL DEPARTURE FOR THE MONTH…………………+48 [+2.3 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……..-5
TOTAL HEATING UNITS FOR THE SEASON……………0  DEPARTURE……..-5
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE………0

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY……………11  DEPARTURE……..+2
TOTAL COOLING UNITS FOR THE MONTH…………..190  DEPARTURE…….+43
TOTAL COOLING UNITS FOR THE SEASON………….318  DEPARTURE…….+32
TOTAL COOLING UNITS LAST SEASON TO DATE……..325  DEPARTURE……..-7

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)……….E23 W     @  03:11 P.M.
VECTOR #1 (1-Sec)……….23 W     @  03:10 P.M.
VECTOR #2 (1-Sec)……….23 WNW   @  03:12 P.M.
DAVIS #1……………….23 W     @  03:09 P.M.
DAVIS #2 ………………20 W     @  02:12 P.M.
RMY #1 (Instantaneous)…..22 W     @  03:10 P.M.
RMY #2 (Instantaneous)…..22 WNW   @  03:31 P.M.
MERLIN…………………22 W
RICHARDS (C5C) (Inst)……21       @  03:10 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………17 W   @  03:14 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17     @  03:13 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17     @  03:13 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 W   @  03:12 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 W   @  03:13 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 W   @  03:13 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 WNW @  03:13 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………16     @  03:13 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………..7.8 W [187 total miles] VECTOR #1…………………8.7
VECTOR #2…………………8.3
DAVIS #1………………….8.1 W
DAVIS #2………………….8.1 W
RMY #1……………………7.8 W
RMY #2……………………8.2 W
RICHARDS (C5C)…………….8.3

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..5.10 DEPARTURE…..+2.99
TOTAL PRECIPITATION FOR THE YEAR…………..30.28 DEPARTURE…..+0.94

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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/…/..             23 W    VEC1 23 W   RMY 22

7/20 The low since midnight is 64, 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: RECORD HIGH DAILY MINIMUM TEMPERATURE OF 71F;
TIES THE RECORD OF 71F SET IN 1901, 1958, 1968, AND 2013

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

RECORDS FOR JULY 20
HIGH 99F IN 1991
LOW 47F IN 1890
PRECIP 1.64 INS IN 1938
WIND 56e MPH SSW IN 1943

RECORDS FOR JULY 21
HIGH 100F IN 1977 [RECORD FOR MONTH] LOW 48F IN 1890
PRECIP 2.09 INS IN 1938
PEAK GUST 60e MPH WNW IN 1977

TODAY’S REPORT PREPARED BY: Matt Douglas