Sunday, June 21, 2020
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, JUNE 21, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME
HOT AND HAZY WITH CLOUDS INCREASING
INTO THE AFTERNOON….
Today we experienced abundant sunshine in
the morning, with skies becoming mostly
cloudy in the afternoon hours. Visibility
was 20 miles on average due to a
significant haze. However, visibility
opened up to 35 miles following the
1 P.M. observation. A distant cumulonimbus
cloud was seen to the northwest at the 10 P.M.
observation, later seen to be a thunderstorm near
Nashua, NH.
Great Blue Hill is officially in an abnormally
dry pattern. The on-going drought places us at
1.23 inches below the monthly normal, yet over
4 inches below the average for the year!
The high so far today is 89 degrees, this
is 12 degrees above the daily normal high
of 77F. The low since midnight is 68F,
which is 10 degrees above the daily normal
low of 58F.
Today’s Observations:
7 A.M.
Weather: Broken cirrus, few altocumulus
Temperature: 73F; Dew Point: 66F; Relative Humidity: 78%
Wind: SSW at 7 kts
Sea-level pressure: 30.02 ins. Hg: rising steadily
Visibility: 25 miles, hazy
6-hr Max temp: 73F
6-hr Min temp: 68F
24-hr Precip: 0.00 ins
24-hr Snowfall: 0.0 ins.
BHO SA 1155 250 SCT 25 165/73/66/2107/002/ FEW AC ALQDS
HAZY/ 8/088 53005 10073 20068
10 A.M.
Weather: Scattered cumulus, broken cirrostratus, with a
distant cumulonimbus cloud to the north-northwest
Temperature: 83F; Dew Point: 66F; Relative Humidity: 57%
Wind: SSW at 5 kts, light
Sea-level pressure: 30.03 ins. Hg: falling then rising
Visibility: 20 miles, hazy
3-hr Precip: 0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 50 SCT 250 SCT 20 168/83/66/2005/003/ HAZY WND LGT/
8/208 51003
1 P.M.
Weather: Scattered building cumulus and broken
cirrostratus
Temperature: 88F; Dew Point: 63F; Relative Humidity: 44%
Wind: SSW at 5 kts, light
Sea-level pressure: 30.00 ins. Hg: falling steadily
Visibility: 35 miles, hazy
6-hr Max temp: 89F
6-hr Min temp: 73F
6-hr Precip: 0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 45 SCT 250 BKN 35 158/88/63/2005/000/ HAZY WND LGT/
8/208 58010 10089 20073
SUMMARY FOR SATURDAY, JUNE 20, 2020
TEMPERATURE (DEGREES F)
MAX…..90 NORMAL…..76
MIN…..65 NORMAL…..59
MEAN….78 NORMAL…..68
DEPARTURE FROM 30-YEAR NORMAL……………..+10
TOTAL DEPARTURE FOR THE MONTH……………..+43 [+2.0 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……. -2
TOTAL HEATING UNITS FOR THE MONTH……………40 DEPARTURE…….-24
TOTAL HEATING UNITS FOR THE SEASON…………5852 DEPARTURE……-514
TOTAL HEATING UNITS LAST SEASON TO DATE…….6252 DEPARTURE……-400
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………13 DEPARTURE……. +9
TOTAL COOLING UNITS FOR THE MONTH……………77 DEPARTURE…….+22
TOTAL COOLING UNITS FOR THE SEASON………….109 DEPARTURE…….+30
TOTAL COOLING UNITS LAST SEASON TO DATE………40 DEPARTURE…….+69
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..22 S AT 5:23 P.M.
AERO…………………….21 S AT 5:23 P.M.
ASOS…………………….22 S AT 5:24 P.M.
DAVIS……………………22 S AT 5:07 P.M. RMY 21
FASTEST MILE FOR YESTERDAY………………….15 S AT 5:24 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 S AT 5:24 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………15 S AT 5:24 P.M.
AVERAGE WIND SPEED AND DIRECTION……………9.9 SW
ASOS…………………..10.3
DAVIS………………….10.0 SW [234 deg.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.91 DEPARTURE……-1.23
ASOS…………..1.91
TOTAL PRECIPITATION FOR THE YEAR……….21.70 DEPARTURE……-4.10
ASOS………….22.22
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/…/.. 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/…/.. 26 W AERO 25 W RMY 27
06/13 71/53/62/-3/0.00/…/.. 21 WNW AERO 20 WNW RMY N/A
06/14 67/49/58/-8/0.00/…/.. 21 E AERO 21 ENE RMY 21
06/15 67/53/60/-6/5/0/…/.. 21 NE AERO 16 ENE RMY 20
06/16 73/54/64/-2/0.00/…/.. 18 E AERO 18 E RMY 18
06/17 78/57/68/+1/0.00/…/.. 20 S AERO 20 S RMY 20
06/18 86/59/73/+6/0.00/…/.. 22 S AERO 22 SSW RMY 22
06/19 86/66/76/+9/0.00/…/.. 22 S AERO 22 S RMY 21
06/20 90/65/78/+10/0.00/…/.. 22 S AERO 21 S RMY 21
06/21 The low since midnight is 66F, the daily normal low is 58F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR JUNE 21
HIGH 94F IN 2012
LOW 42F IN 1940
PRECIP 1.40 INS 1903
PEAK GUST 51 MPH SSW IN 2000
RECORDS FOR JUNE 22
HIGH 93F IN 1921, 2012
LOW 43F IN 1940
PRECIP 1.57 INS IN 1900
PEAK GUST 74 MPH NW IN 1988
TODAY’S REPORT PREPARED BY: Benjamin Turner
