Thursday, June 25, 2020

| June 25, 2020 | Reply

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

THURSDAY, JUNE 25, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

DRY CONDITIONS WITH INCREASING WINDS ATOP
THE GREAT BLUE HILL…

Overnight conditions became much drier
atop the Great Blue Hill as dew points
temperatures had dropped into the high
to mid-50s. Winds were light in the
morning increasing as the day progressed
with our max gust so far today being 25
MPH. Visibility was great staying at 75
miles throughout the day. The high so far
today is 83 degrees, this is 5 degrees
above the daily normal high of 78F. The
low since midnight is 63F, which is 3
degrees above the daily normal low of 60F.

Today’s Observations:

7 A.M.
Weather: Scattered cumulus, scattered altocumulus,
scattered cirrostratus
Temperature: 70F; Dew Point: 60F; Relative Humidity: 70%
Wind: NW at 6 kts
Sea-level pressure: 29.96 ins. Hg: Rising, then more slowly
Visibility: 75 miles
6-hr Max temp: 70F
6-hr Min temp: 63F
24-hr Precip: 0.0
24-hr Frozen: 0.0 ins.
BHO SA 1155 50 SCT 200 SCT 250 SCT 75 147/70/60/3106/996/ 8/116
51020 10070 20063

10 A.M.
Weather: Broken cirrostratus, few cumulus
Temperature: 77F; Dew Point: 54F; Relative Humidity: 45%
Wind: SSW at N kts, Wind light and variable
Sea-level pressure: 29.98 ins. Hg: Rising, then more slowly
Visibility: 75 miles
3-hr Precip:  0.00 ins.
3-hr Frozen:   0.0 ins.
BHO SA 1455 250 BKN 75 153/77/54/1902/998/ FEW CU ALQDS WND L/V/
8/106 51006

1 P.M.
Weather: Scattered cumulus, Broken cirrostratus
Temperature: 82F; Dew Point: 55F; Relative Humidity: 39%
Wind: WSW at 12G25 kts
Sea-level pressure: 29.95 ins. Hg: falling, then more rapidly
Visibility: 75 miles
6-hr Max temp: 83F
6-hr Min temp: 70F
6-hr Precip:  0.00 ins.
6-hr Frozen:   0.0 ins.
BHO SA 1755 60 SCT 250 BKN 75 145/82/55/2412G25/995/ 8/106
58008 10083 20070

SUMMARY FOR THURSDAY, JUNE 24, 2020

TEMPERATURE (DEGREES F)
MAX…..84   NORMAL…..78
MIN…..66   NORMAL…..60
MEAN….75   NORMAL…..69

DEPARTURE FROM 30-YEAR NORMAL…………….. +6
TOTAL DEPARTURE FOR THE MONTH……………..+69 [+2.7 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…….-29
TOTAL HEATING UNITS FOR THE SEASON…………5852  DEPARTURE……-519
TOTAL HEATING UNITS LAST SEASON TO DATE…….6254  DEPARTURE……-402

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………10  DEPARTURE……..+5
TOTAL COOLING UNITS FOR THE MONTH…………..116  DEPARTURE…….+43
TOTAL COOLING UNITS FOR THE SEASON………….148  DEPARTURE…….+51
TOTAL COOLING UNITS LAST SEASON TO DATE………56  DEPARTURE…….+92

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 S   AT 1:56 P.M.
AERO…………………….24 S   AT  3:05 P.M.
ASOS…………………….26 S   AT  1:56 P.M.
DAVIS……………………26 S   AT  5:34 P.M. RMY 25
FASTEST MILE FOR YESTERDAY………………….20 SSW AT  2:14 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 S   AT  2:17 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………18 S   AT  2:17 P.M.
AVERAGE WIND SPEED AND DIRECTION……………10.9 S
ASOS………………….. 11.0
DAVIS…………………. 10.5 SSW [203 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.74  DEPARTURE……-0.88
ASOS…………..2.74
TOTAL PRECIPITATION FOR THE YEAR……….22.53  DEPARTURE……-3.75
ASOS………….23.05

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 The low since midnight is 63F, 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 25
HIGH 93F IN 1943,1980, 2005
LOW 47F IN 1903
PRECIP 1.38 INS IN 2012
PEAK GUST 51 MPH W IN 1960

RECORDS FOR JUNE 26
HIGH 96F IN 1952
LOW 45F IN 1986
PRECIP 1.52 INS IN 1945
PEAK GUST 48 MPH N IN 1998

TODAY’S REPORT PREPARED BY: Nicholas Rousseau

Category: Daily Discussions

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