Friday, July 2, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, JULY 2, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0412E
SUNSET: 1925E
*PLEASE NOTE AS OF JULY 1st, 2021, WE ARE USING 1991-2020
CLIMATOLOGICAL NORMALS (old set 1981-2010 is retired)*
FROM T-SHIRTS TO SWEATSHIRTS, SUBSTANTIAL COOLDOWN ATOP
GREAT BLUE HILL…
A number of changes to discuss here!:
First off are the temperatures. We achieved our 2nd
heatwave this season less than 48 hours ago- the 3 day daily
max readings were 93F, 95F, & 94F respectively. Subtract
about 40 degrees and are witnessing the mercury dialing
back to the mid-50s today! A high of just 65F occurred
at midnight, and we have since been rolling through
the 60s and 50s…not the direction you typically see in July.
As of 1PM, the air temp and low are 56F.
Second is the rainfall: Following the thunderstorms on Wednesday
that left 0.54″ of rainfall, we experienced another slug of
moisture rotating in from the southwest. The overnight deposit
totalled a whopping 2.03″ – most of it dropping in a 12-hour
window. These 2 precipitation events have erased a large portion
of the annual deficit (from -3.59″ to now -1.67″). Light rain
continues to fall throughout today adding a meager 0.03″
to the storm total.
Third is the wind: A NE wind has been escalating throughout
the daytime hours aiding the temperature decrease. Peak wind
so far today is 37 MPH.
As far as the skies and visibility are concerned, we are socked
in fog. 1/16 is the best we’ve “seen” so far. Intermittent light
rain has been the theme.
The high so far today is 65F, 15 degrees below the daily average
of 80F. The low so far today is 56F, 6 degrees below the daily
average of 62F.
————————————————————–
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.
-Data provided by, Chief Scientist Mike Iacono
————————————————————–
Today’s Observations:
7 A.M.
Weather: Light Rain, Fog (Sky Obscured, Vertical Visibility 200 ft)
Temperature: 61F; Dew Point: 61F; Relative Humidity: 100%
Wind: ENE @ 12G23 kts
Sea-level pressure: 29.80 in. Hg; rising, then rising more rapidly
Visibility: 1/16 mile
6-hr Max temp: 65F
6-hr Min temp: 61F
24-hr Precip: 2.03 ins.
BHO SA 1155 X W2 1/16R-F 092/61/61/0712G23/980/ R-CTD/ 8//// 53015
70203 10065 20061
10 A.M.
Weather: Light Drizzle, Fog (Sky Obscured, Vertical Visibility 200 ft)
Temperature: 58F; Dew Point: 58F; Relative Humidity: 100%
Wind: ENE @ 19G28 kts
Peak Wind: 32 MPH (28 kts) NE @ 9:26 AM
Sea-level pressure: 29.82 in Hg; steady, then rising
Visibility: 1/16 mile
3-hr Precip: 0.01 ins.
BHO SA 1455 X W2 1/16L-F 097/58/58/0719G28/982/ L-CTD PCPN VRY LGT
PK WND 0428/26/ 8//// 53005 6001/
1 P.M.
Weather: Light Drizzle, Fog (Sky Obscured, Vertical Visibility 200 ft)
Temperature: 56F, Dew point: 56F; Relative Humidity: 100%
Wind: NE @ 17G32 kts
Peak Wind: 37 MPH (32 kts) ENE @ 12:11 PM
Sea-level pressure: 29.84 in Hg; rising, then rising more slowly
Visibility: 1/16 mile
6-hr Max temp: 61F
6-hr Min temp: 56F
6-hr Precip: 0.03 ins.
BHO SA 1755 X W2 1/16L-F 104/56/56/0517G32/984/ L-CTD PCPN VRY LGT
PK WND 0732/11/ 8//// 51007 6003/ 10061 20056
SUMMARY FOR THURSDAY, JULY 1, 2021
TEMPERATURE (DEGREES F)
MAX…….80 NORMAL…..80
MIN…….65 NORMAL…..62
MEAN……73 NORMAL…..71
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……….+2
TOTAL DEPARTURE FOR THE MONTH………………….+2 [+1.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………… 0 DEPARTURE……..0
TOTAL HEATING UNITS FOR THE MONTH…………….0 DEPARTURE……..0
TOTAL HEATING UNITS FOR THE SEASON……………0 DEPARTURE……..0
TOTAL HEATING UNITS LAST SEASON TO DATE……….0 DEPARTURE……..0
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….8 DEPARTURE…….+1
TOTAL COOLING UNITS FOR THE MONTH…………….8 DEPARTURE…….+1
TOTAL COOLING UNITS FOR THE SEASON………….234 DEPARTURE……+88
TOTAL COOLING UNITS LAST SEASON TO DATE……..189 DEPARTURE……+45
PEAK WIND GUST (MPH):
420C/Official…………..22 W @ 3:15 A.M.
AEROVANE (south tower)…..20 WSW @ 4:03 A.M.
ASOS…………………..OUT OF SERVICE D/T RENOVATIONS
VECTOR #1………………20 @ 4:22 A.M.
VECTOR #2 (south tower)….21 @ 8:10 A.M.
DAVIS #1……………….20 W @ 3:15 A.M.
DAVIS #2 (south tower)…..19 WSW @ 4:03 A.M.
RMY……………………21 @ 8:30 A.M.
MERLIN…………………n/a
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 WNW @ 8:12 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14 @ 1:51 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 W @ 3:12 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 WNW @ 8:12 A.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..14 W @ 3:11 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….7.8 W [186 total miles] ASOS………………….OUT OF SERVICE D/T RENOVATIONS
VECTOR #1……………..8.3
DAVIS #1………………8.4 W
DAVIS #2………………8.5 W
RMY…………………..8.0 WSW
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….2.03 DEPARTURE….+1.92
TOTAL PRECIPITATION FOR THE MONTH………….2.03 DEPARTURE….+1.92
TOTAL PRECIPITATION FOR THE YEAR………….25.41 DEPARTURE….-1.67
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 80/65/73/+2/…./…/.. 22 W AERO 20 WSW RMY 21
07/02 The low since midnight is 56F, the daily normal low is 62F
RECORDS FOR JUNE:
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 2
HIGH 95F IN 1963
LOW 47F IN 1988
PRECIP 1.42 INS IN 1986
PEAK GUST 45 MPH SW IN 1999
RECORDS FOR JULY 3
HIGH 99F IN 1911
LOW 47F IN 1914
PRECIP 1.36 IN 1985
PEAK GUST 52 MPH NW IN 1963
TODAY’S REPORT PREPARED BY: Andrew Swanson
