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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, JUNE 4, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0409E
SUNSET: 1917E
NEAR RECORD CHILL WITH PERIODS OF VERY LIGHT RAIN SHOWERS….
What a change in weather from a few days ago. From record heat
to near record chill in about 36 hours! The high temperature
yesterday of 53F was 2 degrees shy of tying the record low
maximum temperature of 51F set in 1915 and 1945! Also, the low
temperature for today of 43F was 2 degrees shy from tying the
record low of 41F degrees set in 1915 and 1926. So far for today,
the high has been 52F, which is also 2 degrees shy of tying the
record low maximum for today of 50F set in 1891 and 2012!
Along With the chilly air, overcast skies have dominated with
periods of light rain showers and drizzle. So it’s quite damp
out there today.
The wind has been generally out a north to north-northeasterly
direction, and has increased a bit as we progressed into the
early afternoon hours. A low pressure system over the Gulf of
Maine is backing into the area a bit, thus tightening the
pressure gradient enough to squeeze out some gusts around 25mph.
The average speed for the day has been around 11mph so far.
Visibility has been limited due to areas of showers and thin
fog. Views of upwards to 50 miles were seen this morning, but
has decreased overall to around 30 miles early this afternoon.
The high temperature so far today is 52F, this is 20 degrees
below the normal maximum of 72F. The low since midnight is 43F,
this is 11 degrees below the normal minimum of 54F.
The month of May ended up being exceptionally sunny here at
Blue Hill. As a matter of fact, it was the sunniest May ever
recorded. It was also the 4th sunniest of any month here at
Blue Hill since 1885. Here is the updated ranking as compiled
by our Chief Scientist, Mike Iacono.
BHO Highest May Bright Sunshine, hours (1885-2023):
1) 329.9 in 2023 [75%] 2) 318.9 in 1964 [73%] 3) 304.4 in 1977 [70%] 4) 295.8 in 1955 [68%] 5) 288.4 in 1991 [66%]
BHO Highest Monthly Bright Sunshine, hours (1885-2023):
1) 336.1 in June 1971 [76%] 2) 335.5 in June 1908 [76%] 3) 331.6 in July 1952 [75%] 4) 329.9 in May 2023 [75%] 5) 327.4 in June 1953 [74%] 6) 326.4 in July 1966 [73%] 7) 322.6 in June 1949 [73%] 322.6 in July 2022 [73%]
————————————————————–
PRELIMINARY STATS FOR MAY 2023
TEMPERATURE, Deg. F
Avg. Max. 69.4 [+2.6]
Avg. Min. 47.0 [-1.2]
Mean 58.2 [+0.7]
24-hour corrected mean: 57.7
Max. for month: 86F on the 28th
Min. for month: 34F on the 18th
HEATING DEGREE DAYS
Total heating units: 225 [-033]
Total for the season: 5196 [-949]
Total for last season: 5566
COOLING DEGREE DAYS
Total cooling units: 22 [-003]
Total for the season: 31 [+003]
Total for last season: 60
PRECIPITATION, Inches
Total: 2.55 [-1.27]
Greatest in 24 hrs: 2.06 on the 20th-21st
SNOWFALL, Inches
Total: 0.0 [0.0]
Greatest in 24 hrs: N/A
WIND, mph
Avg. uncorrected wind speed: 10.9 mph
Avg. corrected wind speed: 11.3 mph
Prevailing wind direction: South-southwest [12%]
Peak gust and direction: 44 SSE on the 1st
SUNSHINE:
Campbell-Stokes card minutes: 19794 of a possible 26226, or 75%
Astronomical total minutes: 20482 of a possible 27167, or 75%
————————————————————–
Today’s Observations:
7 A.M.
Weather: Scattered stratocumulus, overcast altostratus, few breaks
in overcast all quadrants
Temperature: 46F; Dew Point: 41F; Relative Humidity: 81%
Wind: N @ 8 kts
Sea-level pressure: 1017.3 mb; 30.04 in. Hg: steady, then falling
Visibility: 50 miles
6-hr Max temp: 46F
6-hr Min temp: 44F
24-hr Precip: 0.14 inches
BHO SA 1155 25 SCT 45 OVC 50 173/46/41/0108/004/
FEW BINOVC ALQDS/ 8/52/ 58002 6000/ 70014 10046 20044
10 A.M.
Weather: Broken stratocumulus, overcast nimbostratus, virga all
quadrants
Temperature: 49F; Dew Point: 44F; Relative Humidity: 80%
Wind: NNE @ 10G17 kts
Sea-level pressure: 1017.2 mb; 30.04 in. Hg: rising, then falling
Visibility: 50 miles, 30 miles W-NW
3-hr Precip: Trace
BHO SA 1455 E25 BKN 40 OVC 50 172/49/44/0210G17/004/
VIRGA ALQDS VSBY 30 W-NW/ 8/52/ 58001 6000/
1 P.M.
Weather: Broken stratocumulus, overcast nimbostratus, virga all
quadrants
Temperature: 50F; Dew Point: 42F; Relative Humidity: 73%
Wind: N @ 14G20 kts
Sea-level pressure: 1016.6 mb; 30.02 in. Hg: steady, then falling
Visibility: 30 miles, 20 miles W-NW
6-hr Max temp: 52F
6-hr Min temp: 46F
6-hr Precip: Trace
BHO SA 1755 E25 BKN 40 OVC 30 166/50/42/0114G20/002/ VIRGA ALQDS
RW-B23E35 VSBY 20 W-NW/ 8/52/ 58006 6000/ 10052 20046
————————————————————–
SUMMARY FOR SATURDAY, JUNE 3, 2023
TEMPERATURE (DEGREES F)
MAX…….53 NORMAL…..71
MIN…….43 NORMAL…..54
MEAN……48 NORMAL…..62
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……..-14
TOTAL DEPARTURE FOR THE MONTH…………………+6 [+1.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………17 DEPARTURE…….+13
TOTAL HEATING UNITS FOR THE MONTH……………17 DEPARTURE……..+3
TOTAL HEATING UNITS FOR THE SEASON…………5213 DEPARTURE……-945
TOTAL HEATING UNITS LAST SEASON TO DATE…….5586 DEPARTURE……-373
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH……………14 DEPARTURE……..+9
TOTAL COOLING UNITS FOR THE SEASON…………..45 DEPARTURE…….+12
TOTAL COOLING UNITS LAST SEASON TO DATE………60 DEPARTURE…….-15
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)……….E36 NE @ 05:51 A.M.
VECTOR #1 (1-Sec)……….38 NE @ 05:51 A.M.
VECTOR #2 (1-Sec)……….40 NE @ 02:27 A.M.
DAVIS #1……………….35 NE @ 02:44 A.M.
DAVIS #2 ………………34 ENE @ 12:33 A.M.
RMY #1 (Instantaneous)…..36 ENE @ 03:27 A.M.
RMY #2 (Instantaneous)…..40 NE @ 02:27 A.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……33 @ 03:23 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………24 ENE @ 03:12 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22 @ 01:32 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23 @ 02:54 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………24 ENE @ 03:28 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 ENE @ 02:54 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 NE @ 09:27 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 ENE @ 02:54 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………21 @ 03:28 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………15.0 ENE [361 total miles]
VECTOR #1……………….14.2
VECTOR #2……………….14.9
DAVIS #1………………..15.0 NE
DAVIS #2………………..15.1 ENE
RMY #1………………….13.8 NE
RMY #2………………….14.4 NE
RICHARDS (C5C)…………..14.3
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.14 DEPARTURE…..-0.01
TOTAL PRECIPITATION FOR THE MONTH…………..0.69 DEPARTURE…..+0.22
TOTAL PRECIPITATION FOR THE YEAR…………..21.44 DEPARTURE…..-1.63
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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
5/1 63/45/54/+1/0.04/0.0/540/64 44 SSE VEC1 46 SSE RMY 48
5/2 57/43/50/-4/0.22/0.0/144/17 33 S VEC1 34 S RMY 35 TSTM
5/3 55/42/49/-5/0.01/0.0/093/11 25 E VEC1 25 E RMY 25
5/4 45/40/43/-11/0.07/0.0/009/01 29 NE VEC1 29 NE RMY 29
5/5 59/43/51/-4/0.07/0.0/367/43 18 NE VEC1 19 NE RMY 19
5/6 74/43/59/+4/0.00/0.0/847/99 25 NW VEC1 26 NW RMY 26
5/7 78/52/65/+10/0.01/0.0/789/92 26 WNW VEC1 27 W RMY 28
5/8 74/49/62/+7/0.03/0.0/800/93 32 NW VEC1 33 NW RMY 35
5/9 60/45/53/-3/0.00/0.0/819/95 24 NE VEC1 25 NE RMY 25
5/10 72/51/62/+6/0.00/0.0/830/96 25 WSW VEC1 26 WSW RMY 26
5/11 81/53/67/+11/T/0.0/729/84 30 W VEC1 30 W RMY 30
5/12 84/57/71/+14/T/0.0/687/79 31 WNW VEC1 35 WNW RMY 34
5/13 81/58/70/+13/0/0.0/715/82 28 NNW VEC1 30 NNW RMY 35
5/14 66/47/57/0/0.00/0.0/822/94 28 NNW VEC1 29 NNW RMY 31
5/15 72/45/59/+2/0.00/0.0/675/77 33 W VEC1 35 W RMY 34
5/16 80/55/68/+10/0.00/0.0/500/57 38 SW VEC1 39 SW RMY 41
5/17 62/37/50/-8/0.00/0.0/836/95 36 NNW VEC1 37 NNW RMY 40
5/18 64/34/49/-9/0.00/0.0/847/96 26 SSW VEC1 28 SSW RMY 28
5/19 68/42/55/-3/0.00/0.0/751/85 36 SSW VEC1 36 SSW RMY 34
5/20 65/51/58/-1/1.97/0.0/018/02 38 S VEC1 39 S RMY 39
5/21 73/55/64/+5/0.09/0.0/533/60 29 SSW VEC1 30 SSW RMY 31
5/22 59/46/53/-6/0.00/0.0/782/88 36 ENE VEC1 38 ENE RMY 39
5/23 65/45/55/-4/0.00/0.0/802/90 17 SE VEC1 18 SE RMY 18
5/24 75/44/60/0/0.04/0.0/697/78 35 NW VEC1 36 NW RMY 38
5/25 67/47/57/-3/0.00/0.0/760/85 25 NNW VEC1 25 NNW RMY 26
5/26 70/44/57/-3/0.00/0.0/850/95 20 N VEC1 21 N RMY 22
5/27 80/48/64/+4/0.00/0.0/870/97 23 SSW VEC1 23 SSW RMY 23
5/28 86/56/71/+10/0.00/0.0/845/94 23 SW VEC1 24 SW RMY 25
5/29 65/48/57/-4/0.00/0.0/873/97 43 ENE VEC1 44 ENE RMY 45
5/30 71/46/59/-2/0.00/0.0/875/97 21 SSW VEC1 21 SSW RMY 21
5/31 80/45/63/+1/0.00/0.0/777/86 20 SSW VEC1 20 SSW RMY 20
DAILY RECORDS
05/18/2023: NEW RECORD LOW MINIMUM TEMPERATURE OF 34F,
THIS BEATS THE OLD RECORD OF 35F SET IN 2002
05/20/2023: NEW RECORD DAILY PRECIPITATION OF 1.97 INCHES,
THIS BEATS THE OLD RECORD OF 1.65 INCHES SET IN 1969
PRELIMINARY CLIMATE SUMMARY FOR JUNE 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
6/1 88/56/72/+10/0.00/…/.. 21 WSW VEC1 21 WSW RMY 21
6/2 91/53/72/+10/0.53/…/.. 37 ENE VEC1 39 ENE RMY 37
6/3 53/43/48/-14/0.16/…/.. 36 NE VEC1 38 NE RMY 36
6/4 The low since midnight is 43F, the daily normal low is 54F
DAILY RECORDS
06/02/2023: TIED RECORD HIGH MAXIMUM TEMPERATURE OF 91F,
ALSO SET IN 1895
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JUNE 4
HIGH 99F IN 1919 [Record for month]
LOW 41F IN 1915,1926
PRECIP 1.52 INS IN 2007
PEAK GUST 48 MPH SSE IN 1983
RECORDS FOR JUNE 5
HIGH 95F IN 1930
LOW 41F IN 1891
PRECIP 2.83 INS IN 1982
PEAK GUST 57 MPH NNW IN 1988
TODAY’S REPORT PREPARED BY: Matt Douglas
