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

SUNDAY, JULY 21, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0427E
SUNSET: 1914E

MAINLY SUNNY SKIES DOTTED WITH BUILDING CONVECTIVE CLOUDS;
CONTINUED WARM AND LESS HUMID….

Sunshine has been the theme today with only a few various cloud
types observed through the day. This morning mainly high and mid
level clouds were around, but not enough to dim or block the sun.
As we moved through the late morning and early afternoon hours,
increasing amount of convective cumulus clouds have developed
dotting the sky. All in all it’s been a decent day!

Temperatures have warmed into the mid 80s today, but the dew point
has been gradually dropping from the mid 60s to the upper 50s,
which is much better than the oppressive levels we dealt with
the past 2 weeks.

The wind has been on the light side today with an average speed
of around 8mph. The peak gust for the day so far is 18mph which
occurred just before 2am this morning.

Visibility has been somewhat limited today due to haziness. The
view has been holding around 40 miles all day.

The maximum temperature so far today is 85F, which is 3 degrees
above the normal high of 82F. The minimum temperature since
midnight is 68F, which is 4 degrees above the normal low of 64F.

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Today’s Observations:

7 A.M.
Weather: Thin scattered cirrus, few altocumulus distant NE-SE-WSW
Temperature: 72F; Dew Point: 66F; Relative Humidity: 83%
Wind: W @ 6 kts, wind light
Sea-level pressure: 1017.0 mb; 30.03 in. Hg: rising, then more slowly
Visibility: 40 miles, hazy
6-hr Max temp: 72F
6-hr Min temp: 68F
24-hr Precip: Trace
BHO SA 1155 250 -SCT 40 170/72/66/2806/003/ FEW AC DSNT NE-SE-WSW
HAZY WND LGT/ 8/051 51011 6000/ 70000 10072 20068

10 A.M.
Weather: Thin scattered cirrus, few cumulus all quadrants
Temperature: 80F; Dew Point: 62F; Relative Humidity: 54%
Wind: NW @ 4 kts, wind light
Sea-level pressure: 1016.6 mb; 30.02 in. Hg: steady, then falling
Visibility: 40 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 250 -SCT 40 166/80/62/3104/002/ FEW CU ALQDS HAZY
WND LGT/ 8/201 58004

1 P.M.
Weather: Scattered cumulus, thin scattered cirrus
Temperature: 83F; Dew Point: 59F; Relative Humidity: 44%
Wind: NW @ 6 kts, wind light
Sea-level pressure: 1016.1 mb; 30.00 in. Hg: falling, then more slowly
Visibility: 40 miles, hazy
6-hr Max temp: 85F
6-hr Min temp: 72F
6-hr Precip: 0.00 inches
BHO SA 1755 55 SCT 250 -SCT 40 161/83/59/3206/001/ HAZY WND LGT/
8/201 56005 10085 20072

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SUMMARY FOR SATURDAY, JULY 20, 2024

TEMPERATURE (DEGREES F)
MAX…….85 NORMAL…..82
MIN…….63 NORMAL…..64
MEAN……74 NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+1
TOTAL DEPARTURE FOR THE MONTH…………………….+85 [+4.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
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 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….9 DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………..235 DEPARTURE…….+79
TOTAL COOLING UNITS FOR THE SEASON………….413 DEPARTURE……+118
TOTAL COOLING UNITS LAST SEASON TO DATE……..326 DEPARTURE…….+87

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated

F420C (Official)……….E30 WSW @ 07:30 P.M.
VECTOR #1 (1-Sec)……….31 WSW @ 07:31 P.M.
VECTOR #2 (1-Sec)……….32 WSW @ 07:24 P.M.
DAVIS #1……………….29 SW @ 07:31 P.M.
DAVIS #2 ………………34 W @ 07:30 P.M.
RMY #1 (Instantaneous)…..32 WSW @ 07:24 P.M.
RMY #2 (Instantaneous)…..36 WSW @ 07:24 P.M.
MERLIN…………………32 W
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………23 WSW @ 07:30 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21 @ 07:33 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22 @ 07:32 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 SW @ 07:32 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 WSW @ 07:26 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 WSW @ 07:33 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..21 WSW @ 07:26 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….9.7 WSW [232 total miles] VECTOR #1……………..9.9
VECTOR #2…………….10.2
DAVIS #1………………9.9 WSW
DAVIS #2……………..10.1 WSW
RMY #1………………..9.6 WSW
RMY #2……………….10.1 WSW
RICHARDS (C5C)…………OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..2.12 DEPARTURE…..-0.10
TOTAL PRECIPITATION FOR THE YEAR (2024)…….37.80 DEPARTURE…..+8.35

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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 77/63/70/-1/0.07/722/79 29 N VEC1 27 N RMY 28 TSTM
7/2 80/60/70/-1/0.00/886/97 20 N VEC1 20 N RMY 19
7/3 84/62/73/+1/0.00/856/94 25 S VEC1 25 S RMY 26
7/4 85/62/74/+2/0.04/392/43 28 SSW VEC1 28 SSW RMY 28
7/5 84/68/76/+4/0.22/146/16 29 SSW VEC1 29 SSW RMY 29
7/6 77/71/74/+2/0.10/009/01 31 SW VEC1 33 SSW RMY 33
7/7 88/72/80/+8/0.00/345/38 15 SW VEC1 15 SW RMY 14
7/8 91/71/81/+9/0.00/780/86 17 NW VEC1 18 NW RMY 18
7/9 88/72/80/+7/T/534/59 26 SSW VEC1 27 SSW RMY 29
7/10 88/72/80/+7/0.00/552/61 38 SSW VEC1 37 SSW RMY 38
7/11 87/71/79/+6/0.01/470/52 41 SSW VEC1 40 SSW RMY 41
7/12 85/69/77/+4/0.05/478/53 32 SW VEC1 32 SW RMY 32
7/13 80/72/76/+3/0.64/234/26 28 SW VEC1 25 SW RMY 26
7/14 88/69/79/+6/0.00/809/90 18 SW VEC1 18 SW RMY 19
7/15 92/70/81/+8/0.07/539/60 28 WSW VEC1 27 WSW RMY 28 TSTM
7/16 92/72/82/+9/T/797/89 33 SW VEC1 34 SW RMY 34
7/17 89/71/80/+7/0.37/599/67 38 W VEC1 36 W RMY 37 TSTM
7/18 85/68/77/+4/0.55/429/48 37 W VEC1 37 W RMY 38 TSTM
7/19 82/61/72/-1/0.00/864/97 24 N VEC1 24 NNW RMY 23
7/20 85/63/74/+1/T/747/84 30 WSW VEC1 31 WSW RMY 32