Wednesday, June 30, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, JUNE 30, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0410E
SUNSET: 1924E
DAY 3 OF THE HEATWAVE BRINGS MORE RECORD TEMPERATURES TO BLUE
HILL….
Today marked the 3rd day of the heatwave that has encompassed
the region this week. Record breaking warmth was observed today
as well as yesterday.
The low temperature this morning was 73F degrees, if this holds
until midnight tonight, this will set a new record high minimum
for the date, breaking the old record of 71F set in 1945.
We did officially record a new record high for yesterday with 95F
degrees, this beat the old record of 94F degrees set in 1933!
Today’s high so far of 94F ties the record high set in 1945!
In addition to the high heat, oppressive humidity levels have
also been experienced. The dew point, once again today, has
been in the low to mid 70s all day. This allowed the heat index,
or the feels like temperature, to exceed 100F for a time.
The high temperature of 94F today is 15 degrees above the
normal maximum of 79F. The low temperature so far today is
73F, which is 12 degrees above the normal minimum of 61F.
As of June 29th, the month of June is ranking as the warmest on
record with a 24-Hour adjusted mean of 69.6F.
Here is the list of current rankings via our Chief Scientist
Mike Iacono…
BHO Warmest June 24-Hour Adjusted Mean Temperature, deg F (1885-2021):
1) 69.6 in 2021 (through the 29th)
2) 68.7 in 1999
3) 68.5 in 2001
4) 68.3 in 1925
68.3 in 1930
6) 68.2 in 1994
7) 68.0 in 1943
-Discussion template and records section written up by Matt Douglas!
Today’s Observations:
7 A.M.
Weather: Scattered altocumulus and cirrus
Temperature: 78F; Dew Point: 71F; Relative Humidity: 78%
Wind: WSW @ 7 kts
Sea-level pressure: 29.99 in. Hg; falling unsteadily
Visibility: 20 miles, hazy
6-hr Max temp: 78F
6-hr Min temp: 73F
24-hr Precip: 0.00 ins.
BHO SA 1155 140 SCT 250 SCT 20 156/78/71/2507/999/ HAZY/
8/081 70000 56005 10078 20073
10 A.M.
Weather: Scattered altocumulus and cirrus
Temperature: 88F; Dew Point: 71F; Relative Humidity: 58%
Wind: SW @ 8G15 kts
Sea-level pressure: 29.97 in Hg; falling, then more rapidly
Visibility: 25 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 140 SCT 250 SCT 25 148/88/71/2208G15/997/ HAZY/
8/081 58008
1 P.M.
Weather: Scattered cumulus
Temperature: 93F, Dew point: 70F; Relative Humidity: 48%
Wind: WSW @ 10G17 kts
Sea-level pressure: 29.91 in Hg; falling, then more rapidly
Visibility: 35 miles, hazy
6-hr Max temp: 94F
6-hr Min temp: 78F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 35 129/93/70/2510G17/991/ HAZY/ 8/100 58019
10094 20078
SUMMARY FOR TUESDAY, JUNE 29, 2021
TEMPERATURE (DEGREES F)
MAX…….95 NORMAL…..79
MIN…….73 NORMAL…..61
MEAN……84 NORMAL…..70
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL………+14
TOTAL DEPARTURE FOR THE MONTH………………..+132 [+4.4 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……-54
TOTAL HEATING UNITS FOR THE SEASON…………5597 DEPARTURE…..-778
TOTAL HEATING UNITS LAST SEASON TO DATE…….5852 DEPARTURE…..-255
COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………19 DEPARTURE……+13
TOTAL COOLING UNITS FOR THE MONTH…………..180 DEPARTURE……+75
TOTAL COOLING UNITS FOR THE SEASON………….209 DEPARTURE……+76
TOTAL COOLING UNITS LAST SEASON TO DATE……..184 DEPARTURE……+25
PEAK WIND GUST (MPH):
420C/Official…………..26 W @ 11:37 A.M.
AEROVANE (south tower)…..30 W @ 1:22 P.M.
ASOS…………………..26 WSW @ 11:38 A.M.
VECTOR #1………………27 @ 1:22 P.M.
VECTOR #2 (south tower)….31 @ 1:22 P.M.
DAVIS #1……………….27 W @ 11:37 A.M.
DAVIS #2 (south tower)…..28 W @ 1:23 P.M.
RMY……………………27 @ 11:36 A.M.
MERLIN…………………25
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 W @ 1:16 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 W @ 1:15 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20 @ 1:13 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 W @ 1:13 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 W @ 11:38 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..19 W @ 11:37 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….9.8 WSW [234 total miles] ASOS…………………10.4
VECTOR #1…………….10.4
DAVIS #1……………..10.7 W
DAVIS #2……………..10.7 WSW
RMY…………………..9.8 WSW
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……TRACE DEPARTURE…..-0.12
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….2.18 DEPARTURE….-2.02
ASOS………….2.06
TOTAL PRECIPITATION FOR THE YEAR………….22.84 DEPARTURE….-4.02
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 93/70/82/+12/0.00/…/.. 28 SW AERO 28 SW RMY 28
06/29 95/73/84/+14/T/…/.. 26 W AERO 30 W RMY 27 TSTM
06/30 The low since midnight is 73F, the daily normal low is 61F
RECORDS FOR THE MONTH:
JUNE 7: Record high minimum temperature of 69F,
Surpasses previous record of 66F set in 1922 and 1953
JUNE 29: Record high maximum temperature of 95F,
Surpasses previous record of 94F set in 1933
JUNE 29: Record high minimum temperature of 73F,
Surpasses previous record of 71F set in 1999
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JUNE 30
HIGH 94F IN 1964
LOW 47F IN 1919
PRECIP 3.04 INS IN 1921
PEAK GUST 51 MPH WNW IN 1957
RECORDS FOR JULY 1
HIGH 98F IN 1964
LOW 44F IN 1988 [RECORD FOR MONTH]PRECIP 4.46 INS IN 1915 [RECORD FOR MONTH]PEAK GUST 52 MPH WNW IN 1974
TODAY’S REPORT PREPARED BY: Benjamin Turner
