Monday, June 28, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, JUNE 28, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0410E
SUNSET: 1925E
HAZY, HOT, AND HUMID ATOP GREAT BLUE HILL AS A HEAT-
WAVE IS NOW UNDERWAY….
The second heat-wave of the month (and season) is now
underway as today marks the first of likely 3 consecutive
days of temperatures getting to 90F or above. So far today
we’ve reached 92F degrees. The record high for today is
95F set in 1991. We probably won’t make it, but it’ll be
close.
The other big issue in addition to the heat is the
oppressive humidity. The dew point has been holding in the
low 70s all day, helping the heat index, or the feels like
temperature, to reach and at times exceed 100F.
There is a southwest breeze that’s been averaging around
11mph since 7 A.M. that is helping a little bit with some
very minor relief. The peak gust thus far has been 25mph.
The high temperature so far today is 92F, this is 13 degrees
above the normal maximum of 79F. The low temperature so far
today is 70F, which is 9 degrees above the normal minimum
of 60F.
As of yesterday June 27th, the month of June is ranking as
the 2nd warmest on record with a 24-Hour adjusted mean of
68.6F. We’re likely heading for 1st place with 2 more very
warm days ahead as we close out the month. Here is the list
of current rankings via our Chief Scientist Mike Iacono…
BHO Warmest June 24-Hour Adjusted Mean Temperature, deg F (1885-2020):
1) 68.7 in 1999
2) 68.5 in 2001
3) 68.3 in 1925
68.3 in 1930
5) 68.2 in 1994
6) 68.0 in 1943
Today’s Observations:
7 A.M.
Weather: Thin broken cirrus
Temperature: 76F; Dew Point: 70F; Relative Humidity: 82%
Wind: SW @ 11G19 kts
Sea-level pressure: 30.19 in. Hg; rising unsteadily
Visibility: 15 miles, hazy
6-hr Max temp: 76F
6-hr Min temp: 70F
24-hr Precip: 0.00 ins.
BHO SA 1155 E250 -BKN 15 222/76/70/2311G19/019/ HAZY/ 8/001
52009 10076 20070
10 A.M.
Weather: Thin broken cirrus, few cumulus distant W-N
Temperature: 86F; Dew Point: 71F; Relative Humidity: 61%
Wind: SW @ 10 kts
Sea-level pressure: 30.18 in Hg; steady, then falling
Visibility: 20 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 E250 -BKN 20 219/86/71/2310/018/ FEW CU DSNT W-N
HAZY/ 8/201 58003
1 P.M.
Weather: Scattered cumulus, thin broken cirrus
Temperature: 91F, Dew point: 70F; Relative Humidity: 51%
Wind: WSW @ 10G18 kts
Sea-level pressure: 30.15 in Hg; falling, then more rapidly
Visibility: 25 miles, hazy
6-hr Max temp: 92F
6-hr Min temp: 76F
6-hr Precip: 0.00 ins.
BHO SA 1755 E40 SCT 250 -BKN 25 211/91/70/2410G18/015/ HAZY/
8/201 58008 10092 20076
SUMMARY FOR SUNDAY, JUNE 27, 2021
TEMPERATURE (DEGREES F)
MAX…….85 NORMAL…..78
MIN…….70 NORMAL…..60
MEAN……78 NORMAL…..69
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….. +9
TOTAL DEPARTURE FOR THE MONTH………………..+106 [+3.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL THRU JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 0 DEPARTURE…….-1
TOTAL HEATING UNITS FOR THE MONTH……………19 DEPARTURE……-52
TOTAL HEATING UNITS FOR THE SEASON…………5597 DEPARTURE…..-777
TOTAL HEATING UNITS LAST SEASON TO DATE…….5852 DEPARTURE…..-255
COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………13 DEPARTURE…….+8
TOTAL COOLING UNITS FOR THE MONTH…………..144 DEPARTURE……+56
TOTAL COOLING UNITS FOR THE SEASON………….173 DEPARTURE……+61
TOTAL COOLING UNITS LAST SEASON TO DATE……..175 DEPARTURE…….-2
PEAK WIND GUST (MPH):
420C/Official…………..38 SW @ 12:38 P.M.
AEROVANE (south tower)…..39 SW @ 12:38 P.M.
ASOS…………………..37 SSW @ 12:38 P.M.
VECTOR #1………………43 @ 12:38 P.M.
VECTOR #2 (south tower)….41 @ 3:01 P.M.
DAVIS #1……………….35 SW @ 1:24 P.M.
DAVIS #2 (south tower)…..38 SW @ 12:38 P.M.
RMY……………………42 @ 12:38 P.M.
MERLIN…………………40
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………28 SW @ 1:16 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….25 SSW @ 3:04 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..27 @ 12:38 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………27 WSW @ 12:38 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………28 SW @ 12:39 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..25 SW @ 12:38 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……16.3 SSW [392 total miles] ASOS…………………16.2
VECTOR #1…………….16.4
DAVIS #1……………..15.6 SW
DAVIS #2……………..16.5 SW
RMY………………….15.7 SW
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE…..-0.12
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….2.18 DEPARTURE….-1.80
ASOS………….2.06
TOTAL PRECIPITATION FOR THE YEAR………….22.84 DEPARTURE….-3.80
ASOS………..22.92
PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY: R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M: Missing data
06/01 74/50/62/0/0.00/425/47 20 WSW AERO 24 WSW RMY 22
06/02 80/55/68/+6/0.00/553/61 28 S AERO 25 S RMY 28
06/03 73/56/65/+3/0.01/073/08 29 SSW AERO 29 SSW RMY 29
06/04 77/61/69/+6/0.02/054/06 23 SW AERO 25 WSW RMY 25 TSTM
06/05 87/60/74/+11/0.00/801/88 32 SSW AERO 37 SSW RMY 35
06/06 91/69/80/+17/0.00/819/90 30 WSW AERO 31 WSW RMY 32
06/07 92/69/81/+17/0.00/838/92 31 SSW AERO 35 SSW RMY 34
06/08 92/69/81/+17/0.06/456/50 24 WSW AERO 25 WSW RMY 27 TSTM
06/09 88/70/79/+15/0.02/530/58 21 N AERO 23 NNW RMY 23
06/10 70/53/62/-3/0.00/795/87 28 NE AERO 28 NE RMY 28
06/11 70/51/61/-4/0.13/411/45 21 SSE AERO 22 SSE RMY 22
06/12 72/53/63/-2/0.43/430/47 20 WSW AERO 18 WSW RMY 20
06/13 82/56/69/+4/0.00/860/94 26 SSW AERO 29 SSW RMY 29
06/14 65/56/61/-5/0.63/027/03 28 S AERO 30 SSE RMY 29
06/15 77/61/69/+3/T/357/39 18 NE AERO 20 NE RMY 18 TSTM
06/16 73/56/65/-1/0.00/769/84 27 NNW AERO 31 NNW RMY 27
06/17 77/52/65/-2/0.00/880/96 21 WNW AERO 21 NW RMY 23
06/18 82/56/69/+2/T/789/86 26 WSW AERO 28 WSW RMY 30
06/19 86/63/75/+8/0.09/504/55 30 SW AERO 32 SW RMY 32
06/20 85/63/74/+6/0.00/816/89 24 S AERO 25 SSW RMY 25
06/21 83/65/74/+6/0.00/…/.. 37 SSW AERO 39 SSW RMY 39
06/22 84/58/71/+3/0.68/…/.. 30 NW AERO 31 NW RMY 31 TSTM
06/23 73/52/63/-5/0.00/…/.. 25 NW AERO 24 NW RMY 26
06/24 76/58/67/-2/T/…/.. 25 SE AERO 24 SE RMY 25
06/25 71/57/64/-5/0.11/…/.. 23 S AERO 23 S RMY 23
06/26 81/61/71/+2/0.00/…/.. 36 SSW AERO 37 SSW RMY 38
06/27 85/70/78/+9/0.00/…/.. 38 SW AERO 39 SW RMY 42
06/28 The low since midnight is 70F, the daily normal low is 61F
RECORDS FOR THE MONTH:
High minimum on the 7th of 69F, beating the old record of
66F set in 1922 and 1953.
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JUNE 28
HIGH 95F IN 1991
LOW 47F IN 1970
PRECIP 3.27 INS IN 2020
PEAK GUST 52 MPH WSW IN 1993
RECORDS FOR JUNE 29
HIGH 94F IN 1933
LOW 42F IN 1919
PRECIP 1.60 INS IN 1889
PEAK GUST 49 MPH S IN 1957
TODAY’S REPORT PREPARED BY: Matt Douglas
