Saturday, June 27, 2020

| June 28, 2020 | Reply

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

SATURDAY, JUNE 27, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A HAZY DAY WITH SOME RAIN STARTING IN THE
AFTERNOON….

Today we observed hazy conditions that dropped
visibility from 40 to 25 miles between the 7 A.M.
and 1 P.M. observations. Wind was southerly, with
an average speed of 10 mph and a max gust of 17 mph.
Pressure is on a steady decline, decreasing about
3 millibars over the course of 6 hours. Cloud cover
has filled in since this morning, with some rain
starting to fall around noontime. With 0.02 inches
falling overnight, there is only a trace in the
gauge as of yet.

We continue to return to the nearly 4 inch precipiation
deficiency from last week – sitting at 3.97 inches at
the moment.

The high so far today is 82 degrees, this is 4
degrees above the daily normal high of 78F. The
low since midnight is 65F, which is 5 degrees
above the daily normal low of 60F.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, broken cirrus
Temperature: 72F; Dew Point: 55F; Relative Humidity: 55%
Wind: WSW at 7 kts
Sea-level pressure: 29.86 ins. Hg: Rising, then falling
Visibility: 40 miles, hazy
6-hr Max temp: 72F
6-hr Min temp: 65F
24-hr Precip: 0.0
24-hr Frozen: 0.0 ins.
BHO SA 1155 140 SCT 250 BKN 40 113/72/55/2507/986/ HAZY/
8/072 70002 56005 10072 20065

10 A.M.
Weather: Overcast stratus
Temperature: 81F; Dew Point: 60F; Relative Humidity: 50%
Wind: SW at 7 kts
Sea-level pressure: 29.83 ins. Hg: Steady, then falling
Visibility: 35 miles, hazy
3-hr Precip:  0.00 ins.
3-hr Frozen:   0.0 ins.
BHO SA 1455 55 OVC 35 102/81/60/2107/983/ 8/6// HAZY/ 58011

1 P.M.
Weather: Overcast altocumulus, rain
Temperature: 76F; Dew Point: 63F; Relative Humidity: 64%
Wind: S at 9 kts
Sea-level pressure: 29.80 ins. Hg: Falling, then more slowly
Visibility: 25 miles, hazy
6-hr Max temp: 82F
6-hr Min temp: 72F
6-hr Precip:  Trace
6-hr Frozen:   0.0 ins.
BHO SA 1755 75 OVC 25 091/76/63/1809/980/ 8/02/ HAZY RBUKN/
56011 10082 20072

SUMMARY FOR FRIDAY, JUNE 26, 2020

TEMPERATURE (DEGREES F)
MAX…..83   NORMAL…..78
MIN…..65   NORMAL…..60
MEAN….74   NORMAL…..69

DEPARTURE FROM 30-YEAR NORMAL…………….. +5
TOTAL DEPARTURE FOR THE MONTH……………..+79 [+2.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……. -1
TOTAL HEATING UNITS FOR THE MONTH……………40  DEPARTURE…….-31
TOTAL HEATING UNITS FOR THE SEASON…………5852  DEPARTURE……-521
TOTAL HEATING UNITS LAST SEASON TO DATE…….6254  DEPARTURE……-402

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………. 9  DEPARTURE……. +4
TOTAL COOLING UNITS FOR THE MONTH……………134  DEPARTURE…….+52
TOTAL COOLING UNITS FOR THE SEASON…………..166  DEPARTURE…….+60
TOTAL COOLING UNITS LAST SEASON TO DATE……….64  DEPARTURE……+102

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 S   AT  1:55 P.M.
AERO…………………….25 S   AT  1:50 P.M.
ASOS…………………….26 S   AT  1:55 P.M.
DAVIS……………………26 S   AT 12:38 P.M RMY 27
FASTEST MILE FOR YESTERDAY………………….16 S   AT 12:38 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 S   AT  3:30 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………17 SSE AT 12:38 P.M.
AVERAGE WIND SPEED AND DIRECTION……………8.9 S
ASOS………………….. 9.2
DAVIS…………………. 8.8 SW [220 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.02  DEPARTURE……-0.10
ASOS…………..0.02
TOTAL PRECIPITATION FOR THE MONTH……….2.76  DEPARTURE……-1.10
ASOS…………..2.76
TOTAL PRECIPITATION FOR THE YEAR……….22.55  DEPARTURE……-3.97
ASOS………….23.07

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  64/42/53/-9/T/0.0/…/..            28 WNW  AERO 29 WNW RMY 28
06/02  72/45/59/-3/…./0.0/…/..         28 W    AERO 27 W   RMY 28
06/03  79/55/67/+5/T/0.0/…/..            29 W    AERO 28 W   RMY 26
06/04  87/62/75/+12/…./0.0/…/..        26 W    AERO 25 S   RMY N/A
06/05  80/65/73/+10/…./0.0/…/..        28 SSW  AERO 28 SSW RMY N/A TSTM
06/06  86/57/72/+9/…./0.0/…/..         55 SW   AERO 59 SW  RMY 59  TSTM
06/07  68/54/61/-3/0.00/0.0/…/..         24 NW   AERO 24 NW  RMY N/A
06/08  77/51/64/0/0.00/0.0/…/..          25 W    AERO 24 W   RMY 25
06/09  77/60/69/+5/T/0.0/…/..            23 E    AERO 21 E   RMY N/A
06/10  70/58/64/-1/T/0.0/…/..            25 E    AERO 24 E   RMY N/A
06/11  71/64/68/+3/0.62/0.0/…/..         40 S    AERO 40 S   RMY 42
06/12  82/63/73/+8/0.00/0.0/…/..         26 W    AERO 25 W   RMY 27
06/13  71/53/62/-3/0.00/0.0/…/..         21 WNW  AERO 20 WNW RMY N/A
06/14  67/49/58/-8/0.00/0.0/…/..         21 E    AERO 21 ENE RMY 21
06/15  67/53/60/-6/5/0/0.0/…/..          21 NE   AERO 16 ENE RMY 20
06/16  73/54/64/-2/0.00/0.0/…/..         18 E    AERO 18 E   RMY 18
06/17  78/57/68/+1/0.00/0.0/…/..         20 S    AERO 20 S   RMY 20
06/18  86/59/73/+6/0.00/0.0/…/..         22 S    AERO 22 SSW RMY 22
06/19  86/66/76/+9/0.00/0.0/…/..         22 S    AERO 22 S   RMY 21
06/20  90/65/78/+10/0.00/0.0/…/..        22 S    AERO 21 S   RMY 21
06/21  90/66/78/+10/0.83/0.0/…/..        33 ESE  AERO 35 ESE RMY 33  TSTM
06/22  77/65/71/+3/0.00/0.0/…/..         15 E    AERO 17 S   RMY 14
06/23  85/65/75/+7/0.00/0.0/…/..         27 S    AERO 24 S   RMY 26
06/24  84/66/75/+6/0.00/0.0/…/..         25 S    AERO 24 S   RMY 25
06/25  84/63/74/+5/0.00/0.0/…/..         29 W    AERO 29 W   RMY 29
06/26  83/65/74/+5/0.02/0.0/…/..         25 S    AERO 25 S   RMY 27

06/27  The low since midnight is 65F, the daily normal low is 60F

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

RECORDS FOR JUNE 27
HIGH 93F IN 1999, 2007
LOW 46F IN 1897
PRECIP 1.72 INS IN 1938
PEAK GUST 55e N IN 1945

RECORDS FOR JUNE 28
HIGH 95F IN 1991
LOW 47F IN 1970
PRECIP 2.09 INS IN 1938
PEAK GUST 52 MPH WSW IN 1993

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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