Tuesday, June 29, 2021

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

TUESDAY, JUNE 29, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0410E
SUNSET:  1925E

DAY 2 OF THE HEATWAVE BRINGS RECORD TEMPERATURES TO BLUE HILL….

Today marked the 2nd day of the heatwave that has encompassed
the region this week. Record breaking warmth was observed today.

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 1999.

We did officially record a new record high for the day with 95F
degrees, this beat the old record of 94F degrees set in 1933!

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 95F today is 16 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 yesterday June 28th, the month of June is ranking as
the warmest on record with a 24-Hour adjusted mean of
69.1F. We’ll likely hang on to 1st place with tomorrow expected
to be another very warm day to 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) 69.1 in 2021 (through the 28th)
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

Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus/castellanus all quadrants
Temperature: 80F; Dew Point: 72F; Relative Humidity: 77%
Wind: W @ 6 kts
Sea-level pressure: 30.18 in. Hg; rising, then steady
Visibility: 15 miles, hazy
6-hr Max temp: 80F
6-hr Min temp: 73F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 15 220/80/72/2606/018/ FEW AC/ACC ALQDS HAZY/
8/080 51003 10080 20073

10 A.M.
Weather: Clear, few cumulus all quadrants, few altocumulus
all quadrants
Temperature: 89F; Dew Point: 74F; Relative Humidity: 62%
Wind: W @ 8 kts
Sea-level pressure: 30.16 in Hg; falling, then more rapidly
Visibility: 25 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 25 212/89/74/2708/016/ FEW CU ALQDS FEW AC ALQDS
HAZY/ 8/230 58007

1 P.M.
Weather: Scattered cumulus, few towering cumulus distant NW,
cumulonimbus distant W  
Temperature: 94F, Dew point: 70F; Relative Humidity: 46%
Wind: W @ 11G20 kts
Sea-level pressure: 30.11 in Hg; falling, then more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 95F
6-hr Min temp: 80F
6-hr Precip: 0.00 ins.
BHO SA 1755 45 SCT 30 195/94/70/2811G20/011/ FEW TCU DSNT NW
CB DSNT W HAZY/ 8/963 58017 10095 20080

SUMMARY FOR MONDAY, JUNE 28, 2021

TEMPERATURE (DEGREES F)
MAX…….93     NORMAL…..79
MIN…….70     NORMAL…..61
MEAN……82     NORMAL…..70

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL………+12
TOTAL DEPARTURE FOR THE MONTH………………..+118 [+4.0 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……-53
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……………17  DEPARTURE……+12
TOTAL COOLING UNITS FOR THE MONTH…………..161  DEPARTURE……+68
TOTAL COOLING UNITS FOR THE SEASON………….190  DEPARTURE……+73
TOTAL COOLING UNITS LAST SEASON TO DATE……..183  DEPARTURE…….+7

PEAK WIND GUST (MPH):
                     420C/Official…………..28 SW  @  5:59 P.M.
                     AEROVANE (south tower)…..28 SW  @  5:51 P.M.
                     ASOS…………………..26 SW  @  5:50 P.M.
                     VECTOR #1………………29     @  5:57 P.M.
                     VECTOR #2 (south tower)….29     @  2:57 P.M.
                     DAVIS #1……………….27 WSW @  5:57 P.M.
                     DAVIS #2 (south tower)…..27 SW  @  5:59 P.M.
                     RMY……………………28     @  5:50 P.M.
                     MERLIN…………………27

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………20 SW  @  6:01 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 SW  @  6:01 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21     @  5:57 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 SW  @  5:57 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 SW  @  5:51 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..20 SW  @  5:57 P.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL……12.7 SW [305 total miles]                     ASOS…………………12.7
                     VECTOR #1…………….13.2
                     DAVIS #1……………..12.7 SW
                     DAVIS #2……………..13.4 SW
                     RMY………………….12.6 SW

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE…..-0.10
                             ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….2.18  DEPARTURE….-1.90
                             ASOS………….2.06
TOTAL PRECIPITATION FOR THE YEAR………….22.84  DEPARTURE….-3.90
                              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 The low since midnight is 73F, 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.

High maximum on the 29th of 95F, beating the old record of
94F set in 1933.

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

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

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

TODAY’S REPORT PREPARED BY: Matt Douglas