Thursday, July 1, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, JULY 1, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0410E
SUNSET: 1924E
A MUCH COOLER START TO JULY AFTER A RECORD-BREAKING JUNE….
Following the thunderstorms last night, we were able to pick
up 0.54 inches of rainfall. This leaves the June precipitation
deficit at 1.59 inches. The yearly deficit is still over 3.5
inches.
Today feels much cooler than days prior, and the heat wave
has officially ended. Skies are mostly cloudy with some
spot showers seen to the north and west. Visibility is still
limited to 40 miles at best.
We did officially match a record high for yesterday with 94F,
which was seen almost 60 years ago in 1964!
The high temperature of 80F today is a degree above the
normal maximum of 79F. The low temperature so far today is
69F, which is 8 degrees above the normal minimum of 61F.
Here are the final temperature rankings for June 2021. Last month
was the first June to ever average as high as 70F, and the previous
record was surpassed by 1.3 deg F, which is a very large jump for a
monthly record.
BHO Warmest June 24-Hour Adjusted Mean Temperature, deg F (1885-2021):
1) 70.0 in 2021
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
BHO Warmest June Average Maximum Temperature, deg F (1885-2021):
1) 80.9 in 2021
2) 80.4 in 1930
3) 80.3 in 1949
4) 79.5 in 1957
79.5 in 1976
BHO Warmest June Average Minimum Temperature, deg F (1885-2021):
1) 60.4 in 2021
2) 59.9 in 1925
3) 59.8 in 2001
4) 59.7 in 1999
5) 59.5 in 2008
Six 90-degree days ties with 1997 for the most in June, and two heat waves
is a new record, since this has never happened before in June at BHO.
-Temperature ranking section is from our Chief Scientist Mike Iacono
Today’s Observations:
7 A.M.
Weather: Scattered altocumulus and cirrostratus,
breaks in overcast NE-S
Temperature: 70F; Dew Point: 69F; Relative Humidity: 95%
Wind: W @ 11G17 kts
Sea-level pressure: 29.87 in. Hg; rising steadily
Visibility: 25 miles, thin fog
6-hr Max temp: 70F
6-hr Min temp: 69F
24-hr Precip: 0.54 ins.
BHO SA 1155 140 BKN 300 BKN 25 115/70/69/2711G17/987/ BINOVC
NE-S THN F ALQDS/ 8/078 70054 53009 10070 20069
10 A.M.
Weather: Broken altocumulus and cirrostratus, few cumulus.
Breaks in overcast NE-SW with virga NW-NE
Temperature: 77F; Dew Point: 68F; Relative Humidity: 74%
Wind: WNW @ 8G14 kts
Sea-level pressure: 29.88 in Hg; rising unsteadily
Visibility: 40 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 110 BKN 250 BKN 40 118/77/68/2908G14/988/ FEW CU
ALQDS BINOVC NE-SW VIRGA NW-NE/ 8/178 52003
1 P.M.
Weather: Broken altocumulus and cirrostratus, few cumulus.
Breaks in overcast NE-SW with virga SW-W
Temperature: 78F, Dew point: 67F; Relative Humidity: 70%
Wind: WNW @ 9G14 kts
Sea-level pressure: 29.87 in Hg; falling unsteadily
Visibility: 35 miles
6-hr Max temp: 80F
6-hr Min temp: 70F
6-hr Precip: 0.00 ins.
BHO SA 1755 110 BKN 250 BKN 35 114/78/67/3009G14/987/ FEW CU
ALQDS BINOVC NE-SW VIRGA SW-W/ 8/278 56004 10080 20070
SUMMARY FOR WEDNESDAY, JUNE 30, 2021
TEMPERATURE (DEGREES F)
MAX…….94 NORMAL…..79
MIN…….69 NORMAL…..61
MEAN……82 NORMAL…..70
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL………+12
TOTAL DEPARTURE FOR THE MONTH………………..+144 [+4.6 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…..-779
TOTAL HEATING UNITS LAST SEASON TO DATE…….5852 DEPARTURE…..-255
COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………17 DEPARTURE……+11
TOTAL COOLING UNITS FOR THE MONTH…………..197 DEPARTURE……+86
TOTAL COOLING UNITS FOR THE SEASON………….226 DEPARTURE……+86
TOTAL COOLING UNITS LAST SEASON TO DATE……..184 DEPARTURE……+42
PEAK WIND GUST (MPH):
420C/Official…………..51 NW @ 5:25 P.M.
AEROVANE (south tower)…..51 NW @ 5:23 P.M.
ASOS…………………..53 NW @ 5:25 P.M.
VECTOR #1………………56 @ 5:24 P.M.
VECTOR #2 (south tower)….57 @ 5:24 P.M.
DAVIS #1……………….50 NW @ 5:25 P.M.
DAVIS #2 (south tower)…..48 NW @ 5:26 P.M.
RMY……………………56 @ 5:24 P.M.
MERLIN…………………52
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………35 NW @ 5:25 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….33 NW @ 5:26 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..35 @ 5:26 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………35 NNW @ 6:14 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………34 NNW @ 5:26 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..33 NNW @ 5:26 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….9.8 WSW [234 total miles] ASOS………………….9.8
VECTOR #1…………….10.3
DAVIS #1……………..10.4 WSW
DAVIS #2……………..10.5 WSW
RMY…………………..9.7 WSW
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.54 DEPARTURE….+0.43
ASOS………….0.51
TOTAL PRECIPITATION FOR THE MONTH………….2.72 DEPARTURE….-1.59
ASOS………….2.57
TOTAL PRECIPITATION FOR THE YEAR………….23.38 DEPARTURE….-3.59
ASOS………..23.43
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 94/69/82/+12/0.54/…/.. 51 NW AERO 53 NW RMY 56 TSTM
07/01 The low since midnight is 69F, 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
JUNE 30: Record high maximum temperature of 94F,
Ties previous record of 94F set in 1964
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated
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
RECORDS FOR JULY 2
HIGH 95F IN 1963
LOW 47F IN 1988
PRECIP 1.42 INS IN 1986
PEAK GUST 45 MPH SW IN 1999
TODAY’S REPORT PREPARED BY: Benjamin Turner
